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At least 1,279 records · Page 71Linked to original sources
PubMed1983

Estimated absorbed dose in tissues and radiation effects in Japanese Thorotrast patients.

The absorbed dose in the liver, spleen and bone marrow of Thorotrast patients was estimated for 71 autopsy cases. 232Th amounts in tissues were determined from measurements of 228Ac gamma-rays and the activity ratio of 228Ac to 232Th. In calculating the absorbed dose, Kaul's data were used as values of the steady state activity ratio between 232Th and its daughters and the self-absorption of alpha-rays in Thorotrast aggregates. The autopsy cases in which the cumulative dose was estimated consisted of 45 cases of malignant hepatic tumor, 12 cases of liver cirrhosis, 7 cases of blood disease and 7 cases of other diseases. The estimated absorbed doses in the organs were presented and the relationship between the dose and radiation effects on organ tissues was discussed.

Absorption↗
PubMed1964

RADIOACTIVITY IN THE ATMOSPHERIC EFFLUENTS OF POWER PLANTS THAT USE FOSSIL FUELS.

Analysis of the fly ash produced by combustion of pulverized Appalachian coal has shown that a 1000-megawatt coal-burning power plant will discharge into the atmosphere from about 28 millicuries to nearly 1 curie per year of radium-226 and radium-228. An oil-burning plant of similar size will discharge about 0.5 millicurie of radium per year. Comparison of these data with data on the release of fission products from nuclear-powered generating stations shows that when the physical and biological properties of the various radionuclides are taken into consideration, the conventional fossil-fueled plants discharge relatively greater quantities of radioactive materials into the atmosphere than nuclearpowered plants of comparable size.

Air Pollution↗
PubMed1964

ENVIRONMENTAL RADIATION: MEASUREMENTS OF DOSE RATES.

The exposure dose from environmental sources of radiation was determined by means of an ionization chamber, by gamma-ray spectrometry in the field, and by measurements of radioactivity in soil cores. The exposure dose from cosmic radiation was found to be 4.4 +/- 0.2 micror/hr, that from natural radioactivity 8.0 +/- 0.3 micror/hr, and the contribution from fission products varied from 2.0 to 7.5 micror/hr during the interval in question.

Cosmic Radiation↗