THE EGS5 CODE SYSTEM

Table 2.3 (cont.)
LABEL a m s x 0 x 1 I(eV) −C
TA 0.1663 2.8050 0.175 3.5 718.0 5.526
W 0.1499 2.8700 0.175 3.5 727.0 5.406
PT 0.1465 2.9030 0.097 3.5 790.0 5.473
AU 0.1533 2.8810 0.097 3.5 790.0 5.575
HG 0.1824 2.7980 0.239 3.5 800.0 5.961
PB 0.1861 2.8140 0.239 3.5 823.0 6.202
RN-GAS 0.1130 3.0230 1.537 5.3 794.0 13.284
U 0.1362 3.0340 0.239 3.5 890.0 5.869
AIR-GAS 0.2466 2.8790 1.742 4.0 85.7 10.595
CO2-GAS 0.1999 3.0220 1.648 4.0 88.7 10.239
POLYETHYLENE 0.4875 2.5440 0.138 2.0 57.4 3.002
POLYPROPYLENE 0.2493 2.9750 0.154 2.3 59.2 3.126
XYLENE 0.2755 2.9110 0.169 2.3 61.8 3.270
TOLUENE 0.2830 2.8900 0.172 2.3 62.5 3.303
NYLON 0.5345 2.4390 0.134 2.0 63.9 3.063
VINYLTOLUENE 0.3495 2.7490 0.147 2.2 64.7 3.201
A150-PLASTIC 0.5462 2.4350 0.133 2.0 65.1 3.110
STILBENE 0.2989 2.8510 0.173 2.3 67.7 3.367
POLYSTYRENE 0.3670 2.7240 0.165 2.2 68.7 3.300
ANTHRACENE 0.5858 2.3640 0.115 2.0 69.5 3.151
LEXAN 0.3865 2.6640 0.161 2.2 73.1 3.321
LUCITE 0.3996 2.6060 0.182 2.2 74.0 3.330
H2O 0.2065 3.0070 0.240 2.5 75.0 3.502
MYLAR 0.3124 2.7820 0.156 2.3 78.7 3.326
KAPTON 0.4061 2.6140 0.149 2.2 79.3 3.342
LIF 0.1308 3.4760 0.017 2.5 94.0 3.167
POLYVINYL-CL 0.1873 2.9620 0.156 2.8 108.2 4.053
PYREX-GLASS 0.2988 2.8050 0.148 2.5 134.0 3.971
SIO2 0.1440 3.2200 0.139 2.8 139.2 4.003
CAF2 0.3750 2.5920 0.068 2.5 166.0 4.065
PHOTOEMULSION 0.3416 2.4960 0.101 3.0 331.0 5.332
AGCL 0.1243 3.0020 −0.014 3.5 398.4 5.344
NAI 0.1560 2.9260 0.120 3.5 452.0 6.057
LII 0.1785 2.8450 0.089 3.5 485.1 6.267
AGBR 0.1351 2.9760 0.036 3.5 487.2 5.616
CSI 0.1796 2.8400 0.040 3.5 553.1 6.281
The density effect has been treated extensively by Sternheimer [159, 160, 161, 162, 163], Sternheimer
and Peierls[165], and recently by Berger, Seltzer, and Sternheimer in various collaborations
[20, 152, 151, 166, 164]. According to Sternheimer, the density effect is given by the formulas
⎧
⎨ 0 if x < x 0
δ = 2(ln 10)x + C + a(x
⎩
1 − x) ms if x ∈ (x 0 , x 1 )
(2.271)
2(ln 10)x + C if x > x 1
where
x = log 10 (˘pc/m) = ln η/ln 10, (2.272)
C = −2 ln(Īadj/hν P ) − 1, (2.273)
√
ν P = plasma frequency = nr0 2c2 /π (2.274)
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