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Uranium, thorium and potassium contents and radioactive equilibrium states of the uranium and thorium series nuclides in phosphate rocks and phosphate fertilizers.
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- KOMURA Kazuhisa
- Low Level Radioactivity Laboratory, Kanazawa University
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- YANAGISAWA Mikio
- Power Reactor and Nuclear Fuel Development Co.
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- SAKURAI Jiro
- Nippon Atomic Industry Group Co., Ltd.
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- SAKANOUE Masanobu
- Low Level Radioactivity Laboratory, Kanazawa University
Bibliographic Information
- Other Title
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- りん鉱石およびりん酸肥料中のウラン，トリウム，ガリウム含有量とウラン系列，トリウム系列核種の放射平衡
Description
Uranium, thorium and potassium contents and radioactive equilibrium states of the uranium and thorium series nuclides have been studied for 2 phosphate rocks and 7 phosphate fertilizers. Uranium contents were found to be rather high (39-117 ppm) except for phosphate rock from Kola. The uranium series nuclides were found to be in various equilibration states, which can be grouped into following three categories. (1) Almost in the equilibrium state, (2) 238U≈230Th>210Pb>226Ra and (3) 238U>230Th>210Pb>226Ra. Thorium contents were found to be, in general, low and appreciable disequilibrium of the thorium series nuclides was not observed except one sample. Potassium contents were also very low (less than 0.3% K2O) except for complex fertilizers. Based on the present data, discussions were made for the radiation exposure due to phosphate fertilizers.
Journal
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- RADIOISOTOPES
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RADIOISOTOPES 34 (10), 529-536, 1985
Japan Radioisotope Association
