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Absorption of Nuclear Radiation 129
R/R o or ~/~ o
1.0
HEAVY IONS (a, p, d, etc)
Z
O
03
03
,.,m,
03
Z
n, 0.5 NEUTRONS, Y
t--
UJ
>
.=,,..
w
MONOENERGETIC
0 ~ ~t..~=-~=.~--~ x
0 C 1 C 2 C3 C4
THICKNESS OF ABSORBING MATERIAL
FIG. 6.3. Curves showing relative transmission 0/~0 (or R/Ro) as function of absorber
thickness x. C l and C 3 are average, C 2 and C 4 maximum range.
E
a. 1000
0
E
OC
N 400
o
o
a
R b
100
40
200 C 3 C 4 800 1200
ABSORBER THICKNESS (mg cm -2)
FIG. 6.4. Absorption curve for 32p/}-radiation showing extrapolated (C4) and average (C3)
ranges. The dashed curve is obtained after subtraction of background.
