On the Experimental Determination of the Maximum Range of Monoenergetic Electrons

概要

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Tails of the absorption curves of monoenergetic electrons were measured under various measuring geometries for absorbers of Be, Al, Cu, Ag, and Au at an energy of 15 MeV, and for Al also at 4.1 and 9.8 MeV. The absorber was placed in air and transmitted electrons were detected with an ionization chamber. The curves observed were analyzed with the nth power method to obtain the maximum range. The resulting values were found largely to be affected by the geometry especially in the case of absorbers of high atomic number. It was also found that the tail decays exponentially in the case of the curve observed for Au at the smallest distance between the absorber and the detector. These facts invalidate general use for monoenergetic electrons of the definition of the maximum range given by the nth power method, and a new definition with associated measuring procedure is proposed.
社団法人応用物理学会の論文
1969-03-05