ft
ACTIVITY !'N GPM
LOW ENERGY GAMMA 1,, =100mg/cm*® OF Pb
ENERGY LESS THAN 50 KEV
HIGH ENERGY GAMMA T,
F
1/2
ptt
TOTAL GAMMA
=6200mg/cm? OF Pb
ENERGY =0.6 MEV
107,
4
r
7
10'
O
7
1000
!
2000
_t
3000
i
4000
i
5000
6000
ABSORBER THICKNESS IN mg/cm? OF Pb
Fig. 5.4-—Gamma-absorption curve,
51