Understanding Neutron Radiography

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Neutron Cross Section of the elements ■ http://periodictable.com/Properties/A/NeutronCrossSection.html Charlie Chong/ Fion Zhang
Screen Types-1 1. Transfer screen-indium or dysprosium, In, Dy. 2. Thermal neutron filter using Cadmium for epithermal neutron radiography, Cd. 3. Converter screen uses gadolinium which emit beta particles, Gd. 4. the beta particles are caught by a fluorescing zinc sulfide material 5. Scintillator screen: Zinc sulfide, Lithium carbonate, plastid scintillator 6. Neutron Accelerator Target material: Beryllium, Be. 7. Boron used for neutron shields. Charlie Chong/ Fion Zhang
Page 1 and 2: Understanding Neutron Radiography R
Page 3 and 4: Neutron Source-Cyclotron Charlie Ch
Page 5 and 6: Charlie Chong/ Fion Zhang
Page 7 and 8: 3. Techniques/Calibrations • Bloc
Page 11 and 12: Greek Alphabet Charlie Chong/ Fion
Page 15 and 16: Why Neutron Radiography? "finding l
Page 17: ■ http://minerals.usgs.gov/minera
Page 21 and 22: IVONA TTS Capable. Charlie Chong/ F
Page 23 and 24: Reading-1 ASNTHBVol4Chapter16 Charl
Page 25 and 26: FIGURE 1. Electric bridge wire squi
Page 27 and 28: FIGURE 1. Electric bridge wire squi
Page 29 and 30: FIGURE 2. Comparison of neutron rad
Page 31 and 32: User’s Guide Unlike many other fo
Page 33 and 34: PART 2. Static Radiography with The
Page 35 and 36: 2.2 Neutron Collimation Because the
Page 37 and 38: The source of thermal neutrons is a
Page 39 and 40: Parallel & Divergent Collimator - F
Page 41 and 42: 5.1 Neutron cross sections Neutron
Page 43 and 44: The established direct imaging tech
Page 45 and 46: FIGURE 4. Neutron radiographs of nu
Page 47 and 48: FIGURE 4. Neutron radiographs of nu
Page 49 and 50: ASTM E803 - 91(2013) Standard Test
Page 51 and 52: FIGURE 5. Representative neutron ra
Page 53 and 54: Another reactor that has provided n
Page 55 and 56: FIGURE 7. Hot cell fuel inspection
Page 57 and 58: Hot cell Shielded nuclear radiation
Page 59 and 60: Applications: Hot cells are used to
Page 61 and 62: 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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Charlie Chong/ Fion Zhang
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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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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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where E is the electronic fluence c
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7.2. NITROCELLULOSE FILM 7.2.1. Fil
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In relation to thermal NR, the foll
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7.2.2. Film handling and safety pre
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Following recommendations and regul
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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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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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