Calculational note in support of inventory assessment of three tank trailers using radiological attentuation calculations Page: 3 of 67
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HNF-SD-WM-CN-091
Rev. 0
Page 1 of 64
Calculational Note
in support of
Inventory Assessment of Three Tank Trailers
using Radiological Attenuation Calculations
Harvey Goldberg
21 December 1996
Purpose
The PUREX Plant wishes to ascertain the degree of radiological contamination
inside three tank trailers which are, for all extent and purposes, empty.
Dose/Exposure rate measurements have been performed on the outside of the
tanks which, when combined with historical records of the isotopic composition
of the waste that had been shipped in the tanks, provided an estimate of the
present degree of contamination.
Methodology
The computer code ISOSHLD (References 1, 2, and 3) was used to calculate the
dose rate on the outside of the tanks. Bremsstrahlung from the B-particle
emitting radionuclides was accounted for. The fluence-to-dose conversion
factors used in the calculation were the deep dose equivalent conversion
factors from Reference 4. It was felt that these conversion factors
corresponded best to the calibration of the Hanford hand-held survey
instruments.
Assumptions
It was assumed that each tank could be modeled as a long, thin cylinder with
cylindrical shields between it and the dose points. Dose points were chosen
in the middle and the end of the side of the tank to correspond to the
radiological survey provided by the customer. The first shield which is the
source was modeled somewhat arbitrarily as aluminum.
The density used was the reported density of the original solutions although
by this time evaporation most probably has resulted in a much denser solution.
This is a conservative assumption with respect to the various fission products
and uranium actually in the source. The second shield was chosen to be iron
which is again a conservative assumption since stainless steel is slightly
denser.
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Goldberg, H.J., Westinghouse Hanford. Calculational note in support of inventory assessment of three tank trailers using radiological attentuation calculations, report, December 21, 1996; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc683418/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.