Progress in Nuclear Physics. Volume 3 - download pdf or read online

By O. R. Frisch

ISBN-10: 1483199894

ISBN-13: 9781483199894

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I n addition there was a peak a t about 250 ev (see Fig. 4a) part of which was due to the escape of the K X-radiation of chlorine following K capture. B y using xenon instead of argon as the filling gas, t h e escape probability eK for chlorine K X-rays could be varied from 0-75 t o 0-13. I t was shown t h a t only about one quarter of t h e peak a t 250 ev in argon could be accounted for as an escape peak. The remainder was therefore due to L electron capture. A slight difference in the energy of the peak with the argon and xenon fillings confirmed this interpreta­ tion.

An increase of operating voltage for a given multiplication factor should be beneficial. (d) Energy resolution For a fixed energy spent in a proportional counter there will be fluctuations in the output pulse size. We consider to begin with the fluctuations which are inherent. There are fluctuations in the number of ion pairs initially released by a monokinetic radiation and in the size of avalanche which each ionization electron produces. The problem has been treated theoretically by FRISCH (1948).

T. 32 05 36-36 (5) K, γ, e~ 41-32 47 02 (7) 50-4 57-5 (2) K »aif Gd»» 155 day YbS» 33 day Am- 490 year Osjf 97 day K, y, e~ Κ,γ α, γ, e- κ,γ 59-78 26-43 60-7 69-3 (1) KIRKWOOD, PONTECORVO and HANNA (1948). (2) ROTHWELL and W E S T (1950). (3) MEDICUS, MAEDER and SCHNEIDER (1949). (4) INSCH (1950). (5) BERNSTEIN, BREWER and RUBINSON (1950). (6) KAHN (1951). (7) WEST and ROTH WELL (1950). (8) BELINO, NEWTON and ROSE (1952). (9) BROWNE (1952). 32 Nuclear y-rays (8) (9) (8) THE MEAN ENERGY TO PRODUCE AN ION PAIR 6.

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Progress in Nuclear Physics. Volume 3 by O. R. Frisch

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