Understanding Neutron Radiography

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Too much to remember? Charlie Chong/ Fion Zhang
91. The average thermal neutron flux that gives a dose of 100 mrem in 40 hours is: a. 700 n/cm 2 •s b. 70 n/cm 2 ∙s c. 7 n/cm 2 ∙s d. 0.7 n/cm 2 ∙s 92. When working with a neutron radiography facility, the radiation expected is: a. gamma b. beta c. neutron d. all of the above 93. The intensity of neutron radiation is usually measured m: a. roentgens b. ergs c. neutrons/cm-s d. neutrons/cm 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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Page 187 and 188: Q61. Which element is commonly used
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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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