Shigetoshi Antoku

Dose to the Active Bone Marrow, Gonads, and Skin from Roentgenography and Fluoroscopy

With use of phantom dosimetry, bone-marrow integral, gonadal, and skin doses were calculated for nearly all radiographic and fluoroscopic examinations conducted in the Department of Radiology of the Atomic Bomb Casualty Commission. The data are included in tabular form for reference purposes. These data are being used in a continuing investigation of the contribution of medical x ray to the total exposure experience of atomic bomb survivors. Results obtained in this study are compared with those published by other investigators.

Active Bone Marrow Distribution in the Adult

A study of active bone marrow distribution was made, and tables were compiled showing percentage and quantity of active marrow at specific locations. They will facilitate dose calculations for standard diagnostic and therapeutic radiological procedures, and are adaptable for possible use with an electronic computer.

DNA Single-Strand Breaks of Preheated Cultured Mammalian Cells Irradiated under Nitrogen- and Nitrous Oxide-Saturated Conditions

Radiation-induced DNA single-strand breaks were studied using preheated cultured mouse leukemic cells, L5178Y, exposed to60 Co γ rays under

Estimation of Exposure Pattern and Bone Marrow and Gonadal Doses during Fluoroscopy

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Chemical protection against radiation-induced dna single-strand breaks in cultured mammalian cells.

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DOSE TO PATIENTS FROM ROENTGENOGRAPHY.

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EXPOSURE PATTERN, SURFACE, BONE MARROW INTEGRAL AND GONADAL DOSE FROM FLUOROSCOPY.

Abstract A technique using industrial type X-ray film to determine pattern of exposure and dose during fluoroscopy is described. Using bone marrow distribution tables previously compiled, a basic evaluation of the procedure was made, using a phantom, with the co-operation of ten radiologists in the community. Bone marrow dose and gonadal dose were calculated for each of the examinations and are included. The procedure proved practical and efficient in demonstrating differences in dose by examiner. With modification, it may be useful during patient examinations.

Calibration of Mg2SiO4(Tb) thermoluminescent dosimeters for use in determining diagnostic x‐ray doses to Adult Health Study participants

Protection by mercaptoethylamine (MEA) and thiourea against the induction of DNA single-strand breaks by irradiation under aerated and anoxic conditions and in the frozen state was studied with cultured mouse leukemic L5178Y cells. The results were compared with those previously obtained for colony-forming ability. Under aerated conditions, good correlation was observed between protection against DNA strand breaks and cell lethality over a wide range of concentrations of the protective agents. Under anoxic conditions, DRF values varied from 1.0 to 1.6 for 50 mM MEA and from 1.0 to 1.8 for 100 mM thiourea over the dose range studied. Protection against DNA strand breaks was observed only for doses greater than 20 krad. Protection against DNA strand breaks after irradiation at -196

Medical x-ray exposure doses as contaminants of atomic bomb doses

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A Study of the Biological Effectiveness of High-Energy Electrons at Ultra-High Dose Rates using Dry Eggs of Artemia

C was essentially the same as that for cell lethality. MEA interfered with the rejoining of DNA strand breaks induced by irradiation under aerobic conditions, even when it was removed before the postirradiation incubation. (auth)