Understanding Neutron Radiography

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66. In making a californium isotope exposure in an unshielded area, you find the dose rate 1.9 m (6ft) from the source is 1200 mR/h. What would be the dose rate at 7.3 m (24ft)? a. 75 mR/h b. 100 mR/h c. 200 mR/h d. 300 mR/h 67. In developing film by hand technique without agitation: a. the radiograph will not show proper contrast b. it will be impossible to fix the radiograph c. there will be a greater fogging of the film d. there will be a tendency for each area of the film to affect the development of the area immediately below it 68. Film developed by automatic processors: a. will have improved detail of the image b. will have a general increase in the film density c. takes longer to develop than when processing manually d. will create less fog on the film Charlie Chong/ Fion Zhang
69. The emulsion side of a single-coated photographic X-ray-type film used for neutron radiography can be detected in the darkroom using standard safe lights as the: a. printed identifying marks on the emulsion side b. darker of the two sides c. duller and lighter color of the two sides d. printed identifying marks on the non-emulsion side 70. The purpose of film containers is to: a. protect the film from light b. protect the film from scratches c. neither a nor b d. both a and b 71. The two most common causes for excessively high density radiographs are: a. insufficient washing and overdeveloping b. contaminated fixer and insufficient washing c. overexposure and contaminated fixer d. overexposure and overdevelopment Charlie Chong/ Fion Zhang
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Understanding Neutron Radiography R
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Neutron Source-Cyclotron Charlie Ch
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Charlie Chong/ Fion Zhang
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3. Techniques/Calibrations • Bloc
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Greek Alphabet Charlie Chong/ Fion
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Why Neutron Radiography? "finding l
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■ http://minerals.usgs.gov/minera
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Screen Types-1 1. Transfer screen-i
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IVONA TTS Capable. Charlie Chong/ F
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Reading-1 ASNTHBVol4Chapter16 Charl
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FIGURE 1. Electric bridge wire squi
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FIGURE 1. Electric bridge wire squi
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FIGURE 2. Comparison of neutron rad
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User’s Guide Unlike many other fo
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PART 2. Static Radiography with The
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2.2 Neutron Collimation Because the
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The source of thermal neutrons is a
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Parallel & Divergent Collimator - F
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5.1 Neutron cross sections Neutron
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The established direct imaging tech
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FIGURE 4. Neutron radiographs of nu
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FIGURE 4. Neutron radiographs of nu
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ASTM E803 - 91(2013) Standard Test
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FIGURE 5. Representative neutron ra
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Another reactor that has provided n
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FIGURE 7. Hot cell fuel inspection
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Hot cell Shielded nuclear radiation
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Applications: Hot cells are used to
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Hot Cell Charlie Chong/ Fion Zhang
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FIGURE 8. Cross section showing van
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FIGURE 9. Components of mobile deut
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FIGURE 10. Californium-252 sources
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FIGURE 11. Elevation of subcritical
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Californium-252 Neutron Source Char
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PART 3. Special Techniques of Neutr
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Other reactor centers have develope
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TABLE 2. Relative neutron attenuati
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FIGURE 14. Neutron radiographs of e
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The technique can provide high sens
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3.5 Neutron Gaging and Neutron Prob
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3.6 Closing Industry standards have
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Reading-2 ASNTNRTMQA123 Level-I Cha
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Level 1 Answers Neutron Radiographi
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Q1. Neutron penetration is greatest
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Q6. Many of the absorption differen
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Q11. Gadolinium conversion screens
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The neutrons transmitted through a
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Q20. For inspection of radioactive
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Q24. A graph showing the relationsh
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Q30. Which of the following materia
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Q34. Movement, geometry, and screen
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Q39. An Image Quality Indicator is
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TABLE 6. Properties of Some Thermal
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Charlie Chong/ Fion Zhang Practical
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Q45. In the converter screen techni
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Charlie Chong/ Fion Zhang Practical
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Q50. The primary advantage of using
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More Reading- before going further!
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7. IMAGE RECORDERS The neutron radi
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7.1. PHOTOGRAPHIC FILM 7.1.1. Conve
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TABLE 7.1. Nuclear properties of ne
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TABLE 7.2. Transmittance and film d
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However, the shape of the curves fo
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Page 219 and 220: Peach - 我爱桃子 Charlie Cho
Page 221 and 222: Good Luck Charlie Chong/ Fion Zhang
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Understanding Neutron Radiography

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