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- W1977930069 abstract "Dose evaluations for inhaled radioactive isotopes by means of external counting methods are difficult due to the self shielding characteristics of the human thorax. A study of the self shielding characteristics of the human thorax has been undertaken for low-energy photon emitters including 239Pu, 241Am, 125I, 99mTc, and the X-rays of 198Au using a human cadaver as the phantom. Activity distributions have been obtained for both the “free-in-air” and phantom (lung region) geometries with NaI crystals. Preliminary results indicate that the activity observed from the phantom is not always less than the “free-in-air” case, but is actually greater for certain geometries. Average self shielding factors defined as the ratio of “free-in-air” to phantom counts, have been found to be as follows for a centrally located line distribution: 239Pu (17 keV) −4.35; 125I (30 keV) −3.51; 241Am (60 keV) −1.02; 198Au (70 keV) −0.71; and 99mTc (140 keV) −1.3. The data for 99mTc were taken with a 2 in. dia. × 2 in. NaI crystal close to the chest; the other data were taken with a 2 in. dia. × 1 mm crystal." @default.
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- W1977930069 date "1969-07-01" @default.
- W1977930069 modified "2023-09-23" @default.
- W1977930069 title "Effective Transmission of the Human Thorax for Photons from 239Pu, 244Am, and Other Low-energy Emitters" @default.
- W1977930069 doi "https://doi.org/10.1097/00004032-196907000-00008" @default.
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