Understanding Neutron Radiography

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Q113. The main disadvantage of a divergent beam collimator is: a. that less resolution is possible than with a parallel beam collimator of the same length b. the large physical size of the collimator to achieve L/D ratios that are necessary for good resolution c. that the small end of the collimator near the effective thermal neutron source is small, therefore minimizing the displacement of the moderator d. all of the above Q114. The definition of a neutron is: a. the uncharged particle having a mass slightly greater than that of the proton b. the uncharged particle having a mass slightly less than that of a proton c. the positive charged particle having a mass slightly less than that of the proton d. none of the above Charlie Chong/ Fion Zhang
115. To an Operational Health Physicist, the abbreviation, RBE means: a. Rapid Biological Energy b. Roentgen Background Embrittlement c. Relative Biological Effectiveness d. both a and b 116. The cross section is expressed in area units, the most common being the one that is equal to 10 -24 cm2 This is the: a. femto b. tero c. barn d. watt 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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7.1.4. Film contrast. In discussing
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Figure 7.1. Characteristic curve of
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The slope of a curve at a particula
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Figure 7.3. Characteristic curve of
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7.1.5. Film sensitivity (film speed
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TABLE 7.3. Approximate comparison o
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Figure 7.4. Typical signal-exposure
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Close inspection of the gadolinium
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TABLE 7.4. The characteristics of s
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To make an informed choice of imagi
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TADLE 7.5. Some characlcrislics of
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TADLE 7.8. Average exposure data fo
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Page 187 and 188: Q61. Which element is commonly used
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Page 203 and 204: 91. The average thermal neutron flu
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Page 217 and 218: The neutrons transmitted through a
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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