Model for exposure to a semi-infinite cloud of a photon emitter

Journal Article · Mon Apr 01 04:00:00 EDT 1974 · Health Phys., v. 26, no. 4, pp. 287-293

DOI:https://doi.org/10.1097/00004032-197404000-00001· OSTI ID:4339112

Poston, J W; Snyder, W S

The dose from a semi-infinite cloud of a photon-emitting radionuclide is an idealization of an exposure situation, but it is a useful one, particularly for noble gases of long radioactive decay haif-times, e.g. /sup 85/Kr. An analysis is presented of absorbed dose to body organs for monoenergetic photons emitted in an infinite cloud. Twelve photon energies in the range 0.01 to 4 MeV were used in these calculations, and the concentration in the cloud was considered uniform. The energy spectrum of scattered photons is first calculated by the method of Dillman (to be published), and the resulting fluence is used as the source on an anthropomorphic phantom, essentially as considered in MIRD Pamphlet No. 5 (Snyder et al (1969)). The dose to the various organs is obtained by the Monte Carlo technique. Also a method is described which provides estimates of absorbed dose to organs by use of calculated depth dose profiles in the phantom. This method is used for those organs for which the coefficient of variation of the Monte Carlo estimate exceeded 30%. It is expected that dose from photons emitted in the decay of a real radionuclide could be obtained by interpolation from these results. (auth)

• Research Organization: Oak Ridge National Lab., TN
• NSA Number: NSA-29-028482
• OSTI ID: 4339112
• Journal Information: Health Phys., v. 26, no. 4, pp. 287-293, Journal Name: Health Phys., v. 26, no. 4, pp. 287-293; ISSN HLTPA
• Country of Publication: United Kingdom
• Language: English

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*GAMMA SOURCES-- RADIATION DOSES
*ORGANS-- RADIATION DOSES
*PHANTOMS-- RADIATION DOSES
BIOLOGICAL MODELS
DEPTH DOSE DISTRIBUTIONS
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KEV RANGE 10-100
KEV RANGE 100-1000
KRYPTON 85
MEV RANGE 01-10
MONTE CARLO METHOD
N72100* --Physics (Radiation & Shielding)--Radiation Physics
PHOTON EMISSION
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RADIOACTIVE CLOUDS