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- W2040342114 abstract "The paper discusses the physical aspects of the problem of dosage in radium therapy. Various units are discussed and reasons given for the choice of the “r.” unit. Experimental arrangements are described, including a small ionisation chamber suitable for measurements in the vicinity of a radium needle containing a few milligrammes of Ra. element. The apparatus is calibrated in “r.” units by subjecting the chamber to a beam of hard X rays, which is simultaneously measured by means of a second thimble chamber. The distribution of intensity around a 5-milligramme needle is mapped out. The intensities in r./mg./hr. are measured and found to be in agreement with experiments by Glasser. Using probable data the intensity of radiation at definite distances from a radioactive source are calculated and shown to agree with the experimental results. The relationship between the international r. and the Solomon R. is calculated, and it is shown that 1 r./sec — 1·65 R. This value is in good agreement with experimental results. The “Unit Skin Dose” is of the order of 1800 r. for hard γ rays. The Mallet D. unit and U.S.D. of Martin and Quimby are discussed and shown to be probably of the order of 117 r. and 1400 r. respectively." @default.
- W2040342114 created "2016-06-24" @default.
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- W2040342114 date "1931-12-01" @default.
- W2040342114 modified "2023-09-26" @default.
- W2040342114 title "The Measurement in “r.” Units of the Gamma Rays from Radium" @default.
- W2040342114 doi "https://doi.org/10.1259/0007-1285-4-48-693" @default.
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