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A criticality accident has occured at a facility. You have been assigned to determine which individuals have received a large dose. Using a GM probe you obtain 0.5 mr/hr above background on an individual. Thei estimated dose is: A) background B) 0.5 mrad C) 5 rad D) 25 rad E) 75 rad The correct answer is: E Thumbrule=> 0.1 mr/hr using GM probe on individuals exposed during criticallity accident is 15 Rad. (0.5 mr/hr) * (15 rad) / (0.1 mr/hr) = 75 rad
After exposure rates from radioactive fallout (from nuclear weapons) have begun to decrease, a rough idea of future rates can be gained by using the: A) curie meter rem rule B) 7:10 rule C) submersion dose calculation D) EPA PAG recommendations E) quick sort survey The correct answer is: B This rule states that for every seven-fold increase in time after detonation, there is a ten-fold decrease in exposure rates. The Health Physics and Radiological Health Handbook 1992
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For calculating dose to an organ fr
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The major radiological health conce
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A x-ray machine is operated in a cl
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The goal and future requirement reg
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A Pu-Be source should be stored: A)
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In the shielding equation I = Io e^
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Which of the following is the MOST
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How are tools or equipment transfer
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Which of the following surveys shou
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The following dosimetry should be w
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When using a charcoal cartridge wit
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The use of a Radioactive Yellow III
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Remediation of areas contaminated w
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Leak test of sealed radioactive sou
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The two organzations which review a
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Which of the following contributes
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Which of the following are distingu
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In planning shielding for walls of
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Most operating light water nuclear
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Which of the following is in the or
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The linear attenuation coefficient
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If a shielding material has a half-
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The units used to express u/p (mu o
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Air sample results from an unoccupi
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The minimum recommended face veloci
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An air sampler is run for 45 minute
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A fixed air filter at a nuclear pow
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The agency which approves the desig
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A respirator containing a high effi
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The maximum allowable radiation lev
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At what level does loose alpha cont
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According to the BEIR V Report, the
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Allowable radiation and contaminati
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The four emergency classifications
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A technician responds with emergenc
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The amount of shielding required to
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The transport index is determined a
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The BEST shielding for a Phosphorus
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As a result of Three Mile Island ac
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Radioactive material may be transpo
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What is the attenuation coefficient
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The MAIN purpose of isokinetic samp
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A toluene and P-32 spill occurs in
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The dose buildup factor is 5 at the
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What is the appropriate method of u
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Immediate telephone notification to
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After shutdown of a particle accele
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In a linear accelerator radiation s
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Personnel monitoring equipment is r
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A nurse drops a 30 millicurie liqui
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An air sample is run at 2 cubic fee
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In shielding sources which produce
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Radioactive liquids may be transpor
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The protection factor for an atmosp
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A shield has to be constructed in f
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Reactor chemistry samples are often
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When sampling for radioactive fallo
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One DAC-hour is approximately equal
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Which of the following materials wi
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When is a neutron radiation survey
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Why should swipes in a loose-surfac
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World population exposures due to f
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Strict adherence to ICRP Publicatio
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ICRP recommends a weighting factor
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ICRP Publication 26 states, "No pra
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To limit possible exposure to radia
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In emergency planning, a "protectiv
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State the purpose of the main steam
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The radionuclide that is the main c
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If personnel with doses less than 1
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Prior to 1988, explicit recommendat
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In general, the most important sour
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When communicating information rega
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The ordering of the following shiel
Page 149 and 150: Which of the following statements a
Page 151 and 152: If the most restrictive airborne ra
Page 153 and 154: The maximum protection factor that
Page 155 and 156: For regulatory compliance purposes,
Page 157 and 158: The radionuclide used to improve op
Page 159 and 160: The target and filter material used
Page 161 and 162: Most newer mammographic units conta
Page 163 and 164: Theraputic radionuclides are used t
Page 165 and 166: Radiation leakage from an x-ray tub
Page 167 and 168: The dominant external radiation haz
Page 169 and 170: Power reactors do not routinely cou
Page 171 and 172: The occupation limit for radon expo
Page 173 and 174: Monitoring of nuclear power plant e
Page 175 and 176: Sample lines for plant vents must b
Page 177 and 178: The code of Federal Regulations, 40
Page 179 and 180: During the early phase of an accide
Page 181 and 182: A radioactive shipment is being pre
Page 183 and 184: The effective dose equivalent allow
Page 185 and 186: The amount of tritium allowed by 10
Page 187 and 188: An individual has received an intak
Page 189 and 190: The class "D" in Appendix B to part
Page 191 and 192: The concentration values given in T
Page 193 and 194: The Department of Energy's yearly a
Page 195 and 196: A DOE radiation worker has a lifeti
Page 197 and 198: The best way to reduce the volume o
Page 199: A Notice of Violation will not be i
Page 203 and 204: The leakage radiation from a diagno
Page 205 and 206: What neutron quality factor did the
Page 207 and 208: According to 10 CFR 20 radiological
Page 209 and 210: Which of the following Regulatory G
Page 211 and 212: Which of the following is NOT true
Page 213 and 214: According to the EPA, a home should
Page 215 and 216: A shipment of radioactive materials
Page 217 and 218: The tissue weighting factor for the
Page 219 and 220: According to NUREG-0713, which of t
Page 221 and 222: According to 10 CFR 20 the definiti
Page 223 and 224: According to 10 CFR 20, how often d
Page 225 and 226: You work at a nuclear power plant,
Page 227 and 228: A safe geometry to prevent critical
Page 229 and 230: Which of the following bioassay met
Page 231 and 232: Radiobiological evidence suggests t
Page 233 and 234: The "planned special exposure" prov
Page 235 and 236: A female radiation worker declares
Page 237 and 238: The iodine isotope that would deliv
Page 239 and 240: A Type A quantity of radioactive ma
Page 241 and 242: When working with liquid solutions
Page 243 and 244: At a nuclear power reactor facility
Page 245 and 246: Doses to the thyroid and whole body
Page 247 and 248: The term "reference man" in health
Page 249 and 250: According to 10 CFR 20 Appendix A,
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The Radioactive Yellow II and III l
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For an exclusive use, closed transp
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Which of the following regulations
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The sensitivity of photographic fil
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If the DAC for Rn-222 is 3.0 E-8 mi
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The full width at half maximum peak
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What are the constituents of the fi
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A meter reads 40,000 net cpm and th
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According to ANSI N323-1978, portab
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Common radionuclides used for the c
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How long must a sample with a count
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Quality factor is a function of the
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A proper average quality factor for
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A point source of 137-Cs with an ac
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An individual breathes a concentrat
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A person is standing in a semi-infi
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Personnel dosimetry records must be
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How is beta exposure determined in
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The major internal pathway for radi
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Which of the following radionuclide
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Proportional counters operate at __
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The sensitivity of a pressurized io
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If 100 counts are recorded with a d
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A tissue-equivalent chamber must: A
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The full width at half maximum peak
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A stack is 5 feet in diameter, the
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A sample counted for ten minutes re
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The purpose of a "chi-squared" test
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A worker is exposed to different ra
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Assuming a maximum permissible dose
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You measure the dose rate at a job
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The exposure rate from a point sour
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According to the ICRP, "ALI" stands
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What happens to the noble gases aft
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The detection of radioactive tritiu
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The approximate exposure rate (R/hr
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What materials are most commonly us
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An individual breathes a concentrat
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The MOST effective bioassay method
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According to 10 CFR Part 20, the qu
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When calibrating radiation detectio
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Which of the following is the best
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The DAC for inert gases is based on
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The absorbed dose from the alpha pa
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An Airborne Radioactivity Area must
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Albedo dosimetry will function prop
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What is the ionization region? A) t
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The difference between x-ray and ne
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Three different labs measure the sa
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An ionization chamber which as a di
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A NaI counting system would be appr
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A person is standing in a semi-infi
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The net counts observed from succes
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For NaI and GeLi detectors, as gamm
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Ar-41 is a noble gas which decays b
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The exposure rate at two feet from
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A worker spends 90 minutes in a fie
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Obtaining reproducible results duri
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A worker stands 12 feet from a gamm
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Determine the mean of the following
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The full width of a given photopeak
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In the G-M region of a gas filled t
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Which of the following materials is
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The average number of ion pairs pro
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An important advantage of using a h
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The target organ for most transport
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The short-lived Radon (Rn-222) deca
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Which material is most likely to io
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In a field of mixed neutron and gam
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Tissue dose from thermal neutrons p
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The provisions of ANSI N13.11-1983
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If the skin were contaminated by an
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Which statement is most accurate? A
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Measurement uncertainty in a radiat
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What is the most efficient ratio of
Page 401 and 402:
When performing in-vivo measurement
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Gas and aerosol detectors (smoke de
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To obtain count rates that will fal
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Germanium-Lithium semiconductor det
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One of the components of the liquid
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A sample containing tritium, Carbon
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Quenching effects in a liquid scint
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A gamma spectrometer spectrum of a
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You are analyzing a sample containi
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To improve the efficiency of an ins
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You are assigned to count a number
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The method used to determine the am
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In a gas filled detector a low volt
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A gas-filled detector in which the
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A semi-conductor is distinguished f
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An "acceptor" substance in a semi-c
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The secondary emission ratio of a p
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Methods used to reduce the amount o
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For protons and neutrons, most of t
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A long counter is encased in a cadm
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Choose the BEST answer that describ
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In a photomultiplier tube with 7 dy
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A dose of 20 rem from alpha radiati
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The efficiency for collecting ion p
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Which planchet material would yield
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Which of the following reactions is
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Which of the following has a densit
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A 1Kg block of ice and a 1 Kg block
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The difference between the energy 1
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The process of transferring photon
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Given a uniform disk source of radi
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A photon with a linear attenuation
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The buildup factor used in shieldin
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The half-value thickness for 1 MeV
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BF3 gas filled detectors frequently
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A GM detector with a resolving time
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Electrons that are initially at res
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For general area radiation surveys,
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For a gas filled detector operating
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For a typical NaI scintillation det
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What is the approximate efficiency
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The largest respirable particle is
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A worker wearing a respirator with
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The term solubility or transportabi
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Which is the major factor in consid
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The most important types of environ
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The fraction of unattached radon de
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Why is the thumb rule formula X = 6
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A low energy alpha detector is usua
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A sample of radioactive material is
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A worker accidentally ingested one
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Conjunctivitis may result from a we
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Eventually, charged particles give
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Gamma rays get their energy from: A
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What is the usual unit of measureme
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Normal background radiation exposur
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Plutonium, taken into the circulato
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The average person contains about 0
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The current OSHA standard for far f
Page 519 and 520:
The fraction of atoms which undergo
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The portion of the body most suscep
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The gray is a quantity used to expr
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A very thin windowed Geiger-Mueller
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What is the charge produced in a 25
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What is one of the special units us
Page 531 and 532:
When a charged particle strikes an
Page 533 and 534:
Which of the following is a Beta em
Page 535 and 536:
Which one of the following types of
Page 537 and 538:
What will the activity of 10 Ci of
Page 539 and 540:
Radon has been estimated to account
Page 541 and 542:
Two cost effective means available
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Higher atomic weight (Z) elements t
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Under the SI system there have been
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Smokers have increased exposure to
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When ionizing energy ejects an elec
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What is the decay constant for Carb
Page 553 and 554:
A scintillation counter takes advan
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Radioactive decay is said to be fir
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How long will it take for 200 Ci of
Page 559 and 560:
If an individual incurred a dose eq
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A "pig" is a: A) Container used to
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What is a "neutrino"? A) Massless p
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What is elastic scattering of a pho
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What is the "photoelectric effect"
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What happens to the incident photon
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Which effect predominates in the 10
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What effect predominates in the gre
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What is the SI unit of activity? A)
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The equivalent energy for the rest
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Which of the following is isobaric
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Name the initial and final nuclide
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Name the initial and final member o
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Plutonium: A) Occurs naturally B) I
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What is a use of a chelating agent?
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The periodic table lists: A) All el
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A radionuclide that is constantly b
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The target organ for consideration
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If Kr-90 is released from the stack
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In a radioactive decay process in w
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In a radioactive decay process in w
Page 601 and 602:
A build-up factor equal to one in a
Page 603 and 604:
Radiation in the visible spectrum t
Page 605 and 606:
The energy distribution of alpha em
Page 607 and 608:
Radium is considered to be a ______
Page 609 and 610:
A proportional counter has enough v
Page 611 and 612:
A Geiger counter should never have
Page 613 and 614:
Proportional counters have gas ampl
Page 615 and 616:
The primary function of a radiation
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What is the approximate efficiency
Page 619 and 620:
For what reason is a mica window us
Page 621 and 622:
The function of a cascade impactor
Page 623 and 624:
The "end window" on a Geiger-Muelle
Page 625 and 626:
The term "acute radiation syndrome"
Page 627 and 628:
A fundamental law in radiobiology t
Page 629 and 630:
For transportation of radioactive m
Page 631 and 632:
Which radiation monitoring device u
Page 633 and 634:
The pancake GM probe is designed fo
Page 635 and 636:
Human excreta containing medically
Page 637 and 638:
What is a "phantom" in reference to
Page 639 and 640:
The Department of Transportation (D
Page 641 and 642:
Page 643 and 644:
Page 645 and 646:
KERMA is a unit of radiation measur
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How does the NRC regulate x-ray mac
Page 649 and 650:
The SI unit for radiation absorbed
Page 651 and 652:
The SI unit of activity is the: A)
Page 653 and 654:
The underlying principle for radior
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As a charged particle loses energy
Page 657 and 658:
What is the mathematical relationsh
Page 659 and 660:
The "lapse rate" is the: A) Tempera
Page 661 and 662:
The best data to use to estimate th
Page 663 and 664:
What is a disadvantage of a long sa
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Given a reading of 100 mr/hr (gamma
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Which of the following is not a nat
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The occupational derived air concen
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What does an "alpha" emission consi
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A radium decay scheme is represente
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In the beta particle decay of stron
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What is a Roentgen? A) The amount o
Page 679 and 680:
Why are the low atomic number mater
Page 681 and 682:
The TLV for exposure to radiation f
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Which of the following series is an
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In an absorbing medium, one gray (1
Page 687 and 688:
A one liter Marinelli air sample is
Page 689 and 690:
If an atom is assembled from its co
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You have 400 millicuries of a radio
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The difference between x-rays and g
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A 7 mg/cm2 mylar window is used on
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Effects of acute radiation exposure
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What is the "threshold" of radiatio
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Page 703 and 704:
Most of the dose received by man fr
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For an isotope having an allowed co
Page 707 and 708:
All of the following statements abo
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Isotopes are: A) different radionuc
Page 711 and 712:
Which of the following has the high
Page 713 and 714:
Following electron capture, the fol
Page 715 and 716:
A technician surveys a shielded pur
Page 717 and 718:
In the interaction of thermal neutr
Page 719 and 720:
Which of the following organ system
Page 721 and 722:
Page 723 and 724:
Why are the dose equivalent limits
Page 725 and 726:
Why is a child more radiosensitive
Page 727 and 728:
If a large group of people receive
Page 729 and 730:
What is the main factor determining
Page 731 and 732:
The range of a 2 MeV alpha particle
Page 733 and 734:
An isotope is one of two or more at
Page 735 and 736:
The symbols Pa, Ga, Sn, Ni represen
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If the maximum beta particle energy
Page 739 and 740:
The major source of radiation expos
Page 741 and 742:
In the energy range from 0.1 to 5 M
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The Roentgen is a measure of: A) ab
Page 745 and 746:
The antineutrino is associated with
Page 747 and 748:
The three types of blood cells in t
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The range of an alpha particle in t
Page 751 and 752:
After four half-lives, the original
Page 753 and 754:
Workers are exposed to a Cs-137 con
Page 755 and 756:
Based on the 1990 BEIR V Report, th
Page 757 and 758:
Based on the laws of Bergoinie and
Page 759 and 760:
Which one of the following lists th
Page 761 and 762:
Genetic mutations are one possible
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The roentgen is equal to: A) 1.0 co
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Cancer induced by radon daughters i
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Unlike many man made materials, whe
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Deleterious effects caused by radia
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Cigarette smokers who smoke 1.5 pac
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Sr-85 is used in the treatment of b
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Uranium and Thorium decay products
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The relationship between the mass o
Page 779 and 780:
The NRC defines a hot particle as a
Page 781 and 782:
Uptake and retention of a radionucl
Page 783 and 784:
An active person who eats a high fi
Page 785 and 786:
Cesium-137 decays by emitting: A) t
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A mole of U-238 weighs: A) 238 amu
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The SI unit of energy is: A) Siever
Page 791 and 792:
The nucleus transfers its energy to
Page 793 and 794:
The formula for calculating specifi
Page 795 and 796:
A radionuclide with a parent half-l
Page 797 and 798:
As an alpha particle transverses a
Page 799 and 800:
The average energy of a positron em
Page 801 and 802:
The stopping power for electrons __
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Kerma is the sum of the initial kin
Page 805 and 806:
The term used to describe a process
Page 807 and 808:
Rn-220 is a member of which of the
Page 809 and 810:
Which of the following naturally oc
Page 811 and 812:
An absorbed dose of 3 rad results i
Page 813 and 814:
Which of the following is equivalen
Page 815 and 816:
The electron volt is: A) a unit of
Page 817 and 818:
Which of the following does NOT aff
Page 819 and 820:
If the half life of a radionuclide
Page 821:
Which of the following is the BEST
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