Use of total beta counts to estimate GI tract dose rates Page: 4 of 16
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a count correcte! to represent the total activity present. To test this
proportionality, the counting efficiency of the proportional counter for
the nuclides of greatest significance was compared to the GI dose rate
per unit concentration derived from the MPC. The results of this com-
parison are shown in Table 1. It is apparent that the weighting listed
in the right hand column is not uniform for all nuclides present, especially
zinc-65 and arsenic-76. The relative abundance of the several nuclides
is shown in Figure 1 where it can be seen that the amounts of those nuclides
which have dose rate to count rate ratios greatly different from 0.1
(Zn-65, As-76, and RE + Y)is less than 10; of the total activity.
CALCULATED RELATIONSHIP BETWEEN
BETA COUNTS AND DOSE RATES
Dose Rate Counter Ratio of
per Unit Efficiency Dose Hate to
Nuclide MPC GI Concentration 1 Factor (2 Count Rate
(p77 mrem wk d m mrem/wk
pcml cm c/m/ml
RE + Y 400 0.4 2.00 0.36
Na-24 2,000 0.8 1.74 0.063
P-32 900 0.18 1.79 0.14
Cr-51 20,000 0.008 28.0 0.10
Cr-64 3,000 0.053 4.38 0.10
Zn-65 2,000 0.080 20.8 0.75
As-76 200 0.8 1.81 0.65
Np-239 1,000 0.16 1.75 0.13
(1) Assumes a dose rate of 160 mrem/wk would result from consumption of
1.2 liters per day of water containing a MPC concentration of the
nuclide listed in column 1.
(2) Applicable only to the particular counting equipment and procedures
used by Battelle-Northwest and United States Testing Company labora-
tory at Hanford for counting beta activity in water samples. Assumes
10 mg precipitate weight.
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Hall, R. B. Use of total beta counts to estimate GI tract dose rates, report, October 25, 1965; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1397428/m1/4/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.