no-4y
Fig. =
400
e00
1200
1600
E (Kev)
2000
2400
2800
3200
Avernase Fraction, ¥, 2f Source Photons Entering
petector (including cellimetcr nenetreticn) Versus Gamma
Zuergy
1.0
nos
Pig, 9
400
1200
1600
E (KEV)
Ratio, I/A, of Photons ner Second From Source to
Aree Under Total Absorction Peak (in in.<) for the 209 C/S
Scale Versus Gamma Energy
**