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Search: authors:"Hiroyuki Tsubota"

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Determination of Strontium in Bone with Ion Exchange Separation-Flame Photometric Method

A rapid and sensitive method for the determination of strontium in bone was investigated. Strontium is separated from a large amount of calcium which exists in bone and from interfering ions which depress the strontium emission using cation exchanger with EDTA as an elutriant. Strontium in the effluent, EDTA solution, can readily be determined by flame photometry without any...

Cesium-137 Concentration in Human Urine and Estimation of Cesium-137 Body Burden Due to World-wide Fallout

To evaluate hazards of environmental contamination due to fission products from nuclear weapon test explosions, determination of body burden of the radionuclides taken in human body is essential. Because urine analysis is one of the practical methods to estimate body burden, Cs-137 concentration in human urine has been surveyed in Osaka and Ishikawa Prefectures since the fall of...

Observation of Gamma-emitting Nuclides with Intermediate Half Lives in Rain Water: (October 1961 to December 1962)

Rain water radioactivity in each rain fall was analyzed by gammaray spectrometric method for the gamma-emitting nuclides with intermediate half lives during the period from October 1961 through December 1962. The gamma-ray spectra observed were generally featured with three predominant photopeaks at around 0.14 MeV, 0.5 MeV and 0.75 MeV, which mostly attributed to (141Ce, 144Ce...

A Method of Radiochemical Determination of Cesium-137 in Human Urine

Analytical method to determine cesium-137 in human urine was studied. Cesium-137 with cesium-carrier was adsorbed on solid ammonium molybdophosphate in acidified urine. The precipitate was dissolved with alkaline solution, and cesium was separated with a column of phenol-sulfonic acid type cation exchange resin. Cesium was finally precipitated as cesium perchlorate and its...

Strontium 90 and Cesium 137 in Fallout Deposits and Implications of Their Ratio*

Radioactivity in monthly fallout, which had been collected by the “pot” method, were measured for Sr-90 since October 1956 and Cs-137 since August 1957. Total accumulated amount up to July 1960 were 15 me/km2 for Sr-90 and 31mc/km2 for Cs-137. Distinct spring maxima of fallout rate were observed on May 1959 and 1960. Ratio of the total activities of Cs-137 and Sr-90 since August...