摘要:
The intensity in roentgens per second of X-rays or γ-rays harder than 0.03 Å may be measured with a small thimble chamber with homogeneous walls of elements below atomic number 13 and thick enough to be impermeable to the fastest secondary β-rays. The ionization current measured under saturation conditions at standard temperature and pressure is divided byBV, and correction is made for the apparent absorption of the X-rays m the walls.Vis the volume of the chamber andBis given byA table (Table IV) of the values of 2 loge(Zw/Za) for different wall materials is given, andJ,K, andLare plotted (Fig. 2) as functions of the quality of the radiation.The absolute intensity of radiation in quanta per square centimetre per second may be obtained fromin whichcis the ionization current per unit volume in the chamber, at standard temperature and pressure, produced by one quantum per square centimetre per second.The intensity of the radiation from one milligram of radium in equilibrium, and covered by platinum of wall thicknesst, at one centimetre distance is (8.98 − 1.17 mm.−1 × t) roentgens per hour approximately, ittis not less than 0.3 mm.
ISSN:1923-4287
DOI:10.1139/cjr37a-010
出版商:NRC Research Press
年代:1937
数据来源: NRC