viernes, 6 de junio de 2008

X-Ray Mass Attenuation Coefficients

Table 2. Material constants and composition assumed in the present evaluations for compounds and mixtures. The compositions of various human tissues was taken from ICRU Report 44 (1989). Values are given for the mean ratio of atomic number-to-mass Z/A, the mean excitation energy I, and the density rho. Some density values are only nominal.

Material <Z/A> I Density Composition
(eV) (g/cm3) (Z: fraction
by weight)
A-150 Tissue-Equivalent Plastic 0.54903 65.1 1.127E+00 1: 0.101330
6: 0.775498
7: 0.035057
8: 0.052315
9: 0.017423
20: 0.018377
Adipose Tissue (ICRU-44) 0.55579 64.8 9.500E-01 1: 0.114000
6: 0.598000
7: 0.007000
8: 0.278000
11: 0.001000
16: 0.001000
17: 0.001000
Air, Dry (near sea level) 0.49919 85.7 1.205E-03 6: 0.000124
7: 0.755268
8: 0.231781
18: 0.012827
Alanine 0.53876 71.9 1.424E+00 1: 0.079192
6: 0.404437
7: 0.157213
8: 0.359157
B-100 Bone-Equivalent Plastic 0.52740 85.9 1.450E+00 1: 0.065473
6: 0.536942
7: 0.021500
8: 0.032084
9: 0.167415
20: 0.176585
Bakelite 0.52792 72.4 1.250E+00 1: 0.057444
6: 0.774589
8: 0.167968
Blood, Whole (ICRU-44) 0.54999 75.2 1.060E+00 1: 0.102000
6: 0.110000
7: 0.033000
8: 0.745000
11: 0.001000
15: 0.001000
16: 0.002000
17: 0.003000
19: 0.002000
26: 0.001000
Bone, Cortical (ICRU-44) 0.51478 112.0 1.920E+00 1: 0.034000
6: 0.155000
7: 0.042000
8: 0.435000
11: 0.001000
12: 0.002000
15: 0.103000
16: 0.003000
20: 0.225000
Brain, Grey/White Matter (ICRU-44) 0.55239 73.9 1.040E+00 1: 0.107000
6: 0.145000
7: 0.022000
8: 0.712000
11: 0.002000
15: 0.004000
16: 0.002000
17: 0.003000
19: 0.003000
Breast Tissue (ICRU-44) 0.55196 70.3 1.020E+00 1: 0.106000
6: 0.332000
7: 0.030000
8: 0.527000
11: 0.001000
15: 0.001000
16: 0.002000
17: 0.001000
C-552 Air-equivalent Plastic 0.49969 86.8 1.760E+00 1: 0.024681
6: 0.501610
8: 0.004527
9: 0.465209
14: 0.003973
Cadmium Telluride 0.41665 539.3 6.200E+00 48: 0.468358
52: 0.531642
Calcium Fluoride 0.48671 166.0 3.180E+00 9: 0.486672
20: 0.513328
Calcium Sulfate 0.49948 152.3 2.960E+00 8: 0.470081
16: 0.235534
20: 0.294385
15 mmol L-1 Ceric Ammonium Sulfate Solution 0.55282 76.7 1.030E+00 1: 0.107694
7: 0.000816
8: 0.875172
16: 0.014279
58: 0.002040
Cesium Iodide 0.41569 553.1 4.510E+00 53: 0.488451
55: 0.511549
Concrete, Ordinary 0.50932 124.5 2.300E+00 1: 0.022100
6: 0.002484
8: 0.574930
11: 0.015208
12: 0.001266
13: 0.019953
14: 0.304627
19: 0.010045
20: 0.042951
26: 0.006435
Concrete, Barite (TYPE BA) 0.45714 248.2 3.350E+00 1: 0.003585
8: 0.311622
12: 0.001195
13: 0.004183
14: 0.010457
16: 0.107858
20: 0.050194
26: 0.047505
56: 0.463400
Eye Lens (ICRU-44) 0.54709 74.3 1.070E+00 1: 0.096000
6: 0.195000
7: 0.057000
8: 0.646000
11: 0.001000
15: 0.001000
16: 0.003000
17: 0.001000
Ferrous Sulfate Standard Fricke 0.55334 76.3 1.024E+00 1: 0.108376
8: 0.878959
11: 0.000022
16: 0.012553
17: 0.000035
26: 0.000055
Gadolinium Oxysulfide 0.42265 493.3 7.440E+00 8: 0.084527
16: 0.084704
64: 0.830769
Gafchromic Sensor 0.54384 67.2 1.300E+00 1: 0.089700
6: 0.605800
7: 0.112200
8: 0.192300
Gallium Arsenide 0.44246 384.9 5.310E+00 31: 0.482030
33: 0.517970
Glass, Borosilicate (Pyrex) 0.49707 134.0 2.230E+00 5: 0.040066
8: 0.539559
11: 0.028191
13: 0.011644
14: 0.377220
19: 0.003321
Glass, Lead 0.42101 526.4 6.220E+00 8: 0.156453
14: 0.080866
22: 0.008092
33: 0.002651
82: 0.751938
Lithium Fluride 0.46262 94.0 2.635E+00 3: 0.267585
9: 0.732415
Lithium Tetraborate 0.48485 94.6 2.440E+00 3: 0.082081
5: 0.255715
8: 0.662204
Lung Tissue (ICRU-44) 0.55048 75.2 1.050E+00 1: 0.103000
6: 0.105000
7: 0.031000
8: 0.749000
11: 0.002000
15: 0.002000
16: 0.003000
17: 0.003000
19: 0.002000
Magnesium Tetroborate 0.49012 108.3 2.530E+00 5: 0.240870
8: 0.623762
12: 0.135367
Mercuric Iodide 0.40933 684.5 6.360E+00 53: 0.558560
80: 0.441440
Muscle, Skeletal (ICRU-44) 0.55000 74.6 1.050E+00 1: 0.102000
6: 0.143000
7: 0.034000
8: 0.710000
11: 0.001000
15: 0.002000
16: 0.003000
17: 0.001000
19: 0.004000
Ovary (ICRU-44) 0.55149 75.0 1.050E+00 1: 0.105000
6: 0.093000
7: 0.024000
8: 0.768000
11: 0.002000
15: 0.002000
16: 0.002000
17: 0.002000
19: 0.002000
Photographic Emulsion (Kodak Type AA) 0.48176 179.0 2.200E+00 1: 0.030500
6: 0.210700
7: 0.072100
8: 0.163200
35: 0.222800
47: 0.300700
Photographic Emulsion (Standard Nuclear) 0.45453 331.0 3.815E+00 1: 0.014100
6: 0.072261
7: 0.019320
8: 0.066101
16: 0.001890
35: 0.349104
47: 0.474105
53: 0.003120
Plastic Scintillator, Vinyltoluene 0.54141 64.7 1.032E+00 1: 0.085000
6: 0.915000
Polyethylene 0.57033 57.4 9.300E-01 1: 0.143716
6: 0.856284
Polyethylene Terephthalate, (Mylar) 0.52037 78.7 1.380E+00 1: 0.041960
6: 0.625016
8: 0.333024
Polymethyl Methacrylate 0.53937 74.0 1.190E+00 1: 0.080541
6: 0.599846
8: 0.319613
Polystyrene 0.53768 68.7 1.060E+00 1: 0.077421
6: 0.922579
Polytetrafluoroethylene, (Teflon) 0.47993 99.1 2.250E+00 6: 0.240183
9: 0.759818
Polyvinyl Chloride 0.51201 108.2 1.406E+00 1: 0.048382
6: 0.384361
17: 0.567257
Radiochromic Dye Film, Nylon Base 0.54987 64.5 1.080E+00 1: 0.101996
6: 0.654396
7: 0.098915
8: 0.144693
Testis (ICRU-44) 0.55200 74.7 1.040E+00 1: 0.106000
6: 0.099000
7: 0.020000
8: 0.766000
11: 0.002000
15: 0.001000
16: 0.002000
17: 0.002000
19: 0.002000
Tissue, Soft (ICRU-44) 0.54996 74.7 1.060E+00 1: 0.102000
6: 0.143000
7: 0.034000
8: 0.708000
11: 0.002000
15: 0.003000
16: 0.003000
17: 0.002000
19: 0.003000
Tissue, Soft (ICRU Four-Component) 0.54975 74.9 1.000E+00 1: 0.101174
6: 0.111000
7: 0.026000
8: 0.761826
Tissue-Equivalent Gas, Methane Based 0.54992 61.2 1.064E-03 1: 0.101873
6: 0.456177
7: 0.035172
8: 0.406778
Tissue-Equivalent Gas, Propane Based 0.55027 59.5 1.826E-03 1: 0.102676
6: 0.568937
7: 0.035022
8: 0.293365
Water, Liquid 0.55508 75.0 1.000E+00 1: 0.111898
8: 0.888102
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