viernes, 6 de junio de 2008

X-Ray Mass Attenuation Coefficients

Table 1. Material constants assumed in the present evaluations for elemental media. Values are given for the ratio of atomic number-to-mass Z/A, the mean excitation energy I, and the density rho. Some density values are only nominal; those for Z = 85 and 87 were arbitrarily set to 10 in order to complete the calculations.

Z Element Z/A I Density
(eV) (g/cm3)

1 H Hydrogen 0.99212 19.2 8.375E-05
2 He Helium 0.49968 41.8 1.663E-04
3 Li Lithium 0.43221 40.0 5.340E-01
4 Be Beryllium 0.44384 63.7 1.848E+00
5 B Boron 0.46245 76.0 2.370E+00
6 C Carbon, Graphite 0.49954 78.0 1.700E+00
7 N Nitrogen 0.49976 82.0 1.165E-03
8 O Oxygen 0.50002 95.0 1.332E-03
9 F Fluorine 0.47372 115.0 1.580E-03
10 Ne Neon 0.49555 137.0 8.385E-04
11 Na Sodium 0.47847 149.0 9.710E-01
12 Mg Magnesium 0.49373 156.0 1.740E+00
13 Al Aluminum 0.48181 166.0 2.699E+00
14 Si Silicon 0.49848 173.0 2.330E+00
15 P Phosphorus 0.48428 173.0 2.200E+00
16 S Sulfur 0.49897 180.0 2.000E+00
17 Cl Chlorine 0.47951 174.0 2.995E-03
18 Ar Argon 0.45059 188.0 1.662E-03
19 K Potassium 0.48595 190.0 8.620E-01
20 Ca Calcium 0.49903 191.0 1.550E+00
21 Sc Scandium 0.46712 216.0 2.989E+00
22 Ti Titanium 0.45948 233.0 4.540E+00
23 V Vanadium 0.45150 245.0 6.110E+00
24 Cr Chromium 0.46157 257.0 7.180E+00
25 Mn Manganese 0.45506 272.0 7.440E+00
26 Fe Iron 0.46556 286.0 7.874E+00
27 Co Cobalt 0.45815 297.0 8.900E+00
28 Ni Nickel 0.47708 311.0 8.902E+00
29 Cu Copper 0.45636 322.0 8.960E+00
30 Zn Zinc 0.45879 330.0 7.133E+00
31 Ga Gallium 0.44462 334.0 5.904E+00
32 Ge Germanium 0.44071 350.0 5.323E+00
33 As Arsenic 0.44046 347.0 5.730E+00
34 Se Selenium 0.43060 348.0 4.500E+00
35 Br Bromine 0.43803 343.0 7.072E-03
36 Kr Krypton 0.42959 352.0 3.478E-03
37 Rb Rubidium 0.43291 363.0 1.532E+00
38 Sr Strontium 0.43369 366.0 2.540E+00
39 Y Yttrium 0.43867 379.0 4.469E+00
40 Zr Zirconium 0.43848 393.0 6.506E+00
41 Nb Niobium 0.44130 417.0 8.570E+00
42 Mo Molybdenum 0.43777 424.0 1.022E+01
43 Tc Technetium 0.43919 428.0 1.150E+01
44 Ru Ruthenium 0.43534 441.0 1.241E+01
45 Rh Rhodium 0.43729 449.0 1.241E+01
46 Pd Palladium 0.43225 470.0 1.202E+01
47 Ag Silver 0.43572 470.0 1.050E+01
48 Cd Cadmium 0.42700 469.0 8.650E+00
49 In Indium 0.42676 488.0 7.310E+00
50 Sn Tin 0.42120 488.0 7.310E+00
51 Sb Antimony 0.41889 487.0 6.691E+00
52 Te Tellurium 0.40752 485.0 6.240E+00
53 I Iodine 0.41764 491.0 4.930E+00
54 Xe Xenon 0.41130 482.0 5.485E-03
55 Cs Cesium 0.41383 488.0 1.873E+00
56 Ba Barium 0.40779 491.0 3.500E+00
57 La Lanthanum 0.41035 501.0 6.154E+00
58 Ce Cerium 0.41395 523.0 6.657E+00
59 Pr Praseodymium 0.41871 535.0 6.710E+00
60 Nd Neodymium 0.41597 546.0 6.900E+00
61 Pm Promethium 0.42094 560.0 7.220E+00
62 Sm Samarium 0.41234 574.0 7.460E+00
63 Eu Europium 0.41457 580.0 5.243E+00
64 Gd Gadolinium 0.40699 591.0 7.900E+00
65 Tb Terbium 0.40900 614.0 8.229E+00
66 Dy Dysprosium 0.40615 628.0 8.550E+00
67 Ho Holmium 0.40623 650.0 8.795E+00
68 Er Erbium 0.40655 658.0 9.066E+00
69 Tm Thulium 0.40844 674.0 9.321E+00
70 Yb Ytterbium 0.40453 684.0 6.730E+00
71 Lu Lutetium 0.40579 694.0 9.840E+00
72 Hf Hafnium 0.40338 705.0 1.331E+01
73 Ta Tantalum 0.40343 718.0 1.665E+01
74 W Tungsten 0.40250 727.0 1.930E+01
75 Re Rhenium 0.40278 736.0 2.102E+01
76 Os Osmium 0.39958 746.0 2.257E+01
77 Ir Iridium 0.40058 757.0 2.242E+01
78 Pt Platinum 0.39984 790.0 2.145E+01
79 Au Gold 0.40108 790.0 1.932E+01
80 Hg Mercury 0.39882 800.0 1.355E+01
81 Tl Thallium 0.39631 810.0 1.172E+01
82 Pb Lead 0.39575 823.0 1.135E+01
83 Bi Bismuth 0.39717 823.0 9.747E+00
84 Po Polonium 0.40195 830.0 9.320E+00
85 At Astatine 0.40479 825.0 1.000E+01
86 Rn Radon 0.38736 794.0 9.066E-03
87 Fr Francium 0.39010 827.0 1.000E+01
88 Ra Radium 0.38934 826.0 5.000E+00
89 Ac Actinium 0.39202 841.0 1.007E+01
90 Th Thorium 0.38787 847.0 1.172E+01
91 Pa Protactinium 0.39388 878.0 1.537E+01
92 U Uranium 0.38651 890.0 1.895E+01