MEASUREMENT OF RADIOACTIVE ISOMERS PRODUCED BY GAMMA RAYS. Report No. 3 (Final), November 26, 1959-August 31, 1960
Technical Report
·
OSTI ID:4060066
A three-phase experimental program was pursued in which irradiations were performed on a group of elements expected to produce isomers, a group of food elements, and a group of foods including beef, bacon, shrimp, chicken, and green beans. A variety of radiation sources were used including Cs/sup 137/, Co/ sup 60/, and spent reactor fuel element gamma sources in addition to 4, 8, 16, and 24 Mev x-ray sources. Samples were irradiated to convenient radiation doses following which gamma counting was performed with a NaI well crystal, or beta counting was performed with a lowbackground Geiger counter. Among the 1- to 20- gram element samples, radioactivities of 1 to 10/sup 4/ counts/minute were observed, attributable to the following isomers: Sr/sup 87m/, Cd/sup 111m/, In/ sup 113m/, In/sup 115m/, Sn/sup 117m/, Te/sup 123m/, Te/sup 125m/, Ba/sup 135m/, Lu/sup 176m/, Hf/sup 180m/, Os/sup 190m/, Pt/sup 195m/, Hg/sup 199m/, and Pb/sup 204m/. Isomer yields increased greatly from the lowest-energy source to the highest. No definite induced isomer radioactivity was found in samples of whole food or food ash. The observed isomer radioactivities were used to develop an empirical relationship to calculate radioactivity values for undetected isomers. The formula was used to calculate yields for all known isomers of stable elements with half-life longer than one-half minute. Results indicated that sterilization with gamma and x-ray sources does not add a significant amount tc natural radiation levels in foods. (auth)
- Research Organization:
- Stanford Research Inst., Menlo Park, Calif.
- NSA Number:
- NSA-15-023181
- OSTI ID:
- 4060066
- Report Number(s):
- AD-250828
- Country of Publication:
- United States
- Language:
- English
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