Co-57 Gamma Constant

["Roy A. Parker" <royaparker@COMPUSERVE.COM>]

There seems to be two prevailing Gamma Constants in the literature for

Co-57: 0.15 RHM/Ci and 0.09 RHM/Ci.  The first Gamma Constant, 0.15 RHM/Ci,

seems to be derived from ORNL/RSIC-45/R1 Specific Gamma-Ray Dose Constants

for Nuclides Import to Dosimetry and Radiological Assessment.  The second,

0.09 RHM/Ci, seems to go back to Jaeger, R. G., et al., Engineering

Compendium on Radiation Shielding, Vol. 1, (New York: Springer-Verlag,

1968), pp. 21-30.  I am trying to understand the difference between the two

values.  The ORNL/RSIC value of 0.15 RHM/Ci is strictly computational.  I do

not have a copy of Jaeger.  Is his value based on actual measurement and is

it a lower value because of source size (self absorption) and/or attenuation

because of encapsulation or covering on the source?



Roy A. Parker, Ph.D.

roy@royparker.org





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