Understanding Neutron Radiography

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Q48. An excellent radiograph is obtained under given exposure conditions with a thermal neutron flux of 2 x 10 6 n/cm 2 ∙s for 10 minutes. If other conditions are not changed, what exposure time would be required if the neutron flux was lowered to 1 x 10 6 n/cm 2 ∙s? a. 5 minutes b. 10 minutes c. 20 minutes d. 30 minutes Q49. <strong>Neutron</strong> converter screens should be inspected for flaws or dirt: a. daily b. each time they are used c. occasionally d. when flaws are detected on the radiograph Charlie Chong/ Fion Zhang
Q50. The primary advantage of using a Cf-252 source for neutron radiography is its: a. portability b. low cost per unit neutron flux compared to other neutron radiographic sources c. high resolution d. long useful life without source quality degradation 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
Page 73 and 74: FIGURE 10. Californium-252 sources
Page 75 and 76: FIGURE 11. Elevation of subcritical
Page 77 and 78: Californium-252 Neutron Source Char
Page 79 and 80: PART 3. Special Techniques of Neutr
Page 81 and 82: Other reactor centers have develope
Page 83 and 84: Charlie Chong/ Fion Zhang
Page 85 and 86: TABLE 2. Relative neutron attenuati
Page 87 and 88: FIGURE 14. Neutron radiographs of e
Page 89 and 90: The technique can provide high sens
Page 91 and 92: 3.5 Neutron Gaging and Neutron Prob
Page 93 and 94: 3.6 Closing Industry standards have
Page 95 and 96: Reading-2 ASNTNRTMQA123 Level-I Cha
Page 97 and 98: Level 1 Answers Neutron Radiographi
Page 99 and 100: Q1. Neutron penetration is greatest
Page 101 and 102: Q6. Many of the absorption differen
Page 103 and 104: Q11. Gadolinium conversion screens
Page 105 and 106: The neutrons transmitted through a
Page 107 and 108: Q20. For inspection of radioactive
Page 109 and 110: Q24. A graph showing the relationsh
Page 111 and 112: Q30. Which of the following materia
Page 113 and 114: Q34. Movement, geometry, and screen
Page 115 and 116: Q39. An Image Quality Indicator is
Page 117 and 118: TABLE 6. Properties of Some Thermal
Page 119 and 120: Charlie Chong/ Fion Zhang Practical
Page 121 and 122: Q45. In the converter screen techni
Page 123: Charlie Chong/ Fion Zhang Practical
Page 127 and 128: More Reading- before going further!
Page 129 and 130: 7. IMAGE RECORDERS The neutron radi
Page 131 and 132: 7.1. PHOTOGRAPHIC FILM 7.1.1. Conve
Page 133 and 134: TABLE 7.1. Nuclear properties of ne
Page 135 and 136: TABLE 7.2. Transmittance and film d
Page 137 and 138: However, the shape of the curves fo
Page 139 and 140: 7.1.4. Film contrast. In discussing
Page 141 and 142: Figure 7.1. Characteristic curve of
Page 143 and 144: The slope of a curve at a particula
Page 145 and 146: Figure 7.3. Characteristic curve of
Page 147 and 148: 7.1.5. Film sensitivity (film speed
Page 149 and 150: TABLE 7.3. Approximate comparison o
Page 151 and 152: Figure 7.4. Typical signal-exposure
Page 153 and 154: Close inspection of the gadolinium
Page 155 and 156: TABLE 7.4. The characteristics of s
Page 157 and 158: To make an informed choice of imagi
Page 159 and 160: TADLE 7.5. Some characlcrislics of
Page 161 and 162: TADLE 7.8. Average exposure data fo
Page 163 and 164: where E is the electronic fluence c
Page 165 and 166: 7.2. NITROCELLULOSE FILM 7.2.1. Fil
Page 167 and 168: In relation to thermal NR, the foll
Page 169 and 170: 7.2.2. Film handling and safety pre
Page 171 and 172: Following recommendations and regul
Page 173 and 174: 7.2.3. Exposure techniques and moun
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TABLE 7.9. Neutron fluences for nit
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The multifoil technique in fast NR
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The image generation in silver-hali
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Q51. Neutron beams used in nondestr
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Q56. High-resolution gadolinium con
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Charlie Chong/ Fion Zhang Practical
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Q61. Which element is commonly used
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Q63. Lead is: a. a good neutron shi
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69. The emulsion side of a single-c
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72. Single-emulsion high-resolution
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77. Frilling 皱边 , 脱模 or l
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81. When manually processing films,
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85. Water spots on films can be min
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89. An advantage of the fountain-pe
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91. The average thermal neutron flu
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96. Overexposure to neutron or gamm
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100. The intensity of gamma rays is
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Q106. To achieve uniformity in neut
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TABLE 6. Properties of Some Thermal
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111. A main disadvantage of gadolin
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115. To an Operational Health Physi
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The neutrons transmitted through a
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Peach - 我爱桃子 Charlie Cho
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Good Luck Charlie Chong/ Fion Zhang
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Understanding Neutron Radiography

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