Kaye, G. W. C. (George William Clarkson), 1880-1941 · London, New York [etc.] Longman's Green, and Co. · leaf 261
S penetrating rays of RaC are undoubtedly much smallerstill, and will probably be very difficult to measxire. Rutherford and Andrade also employed an ingenious trans-mission method of measuring the small angle of reflection(about Ij) of the y ray. A point source of radium emanation was placed… … Fio. 112.—Reflection of v rays. photographic plate at B, B. The reflecting planes also castabsorption shadows at C, G, since the transmitted beam isweakened by the loss of the rays that are reflected. A similar reflection occurs at two planes parallel to thepaper, and as a result the photographic…
X-rays
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