MEAN ENERGY EXPENDITURE W FOR FORMATION OF ION PAIRS IN GASES BY ELECTRONS, BETA, GAMMA, AND X RADIATION (in German)
Values for the mean energy necessary for formation of an ion pair in air, He, Ne, Ar, Kr, Xe, H/sub 2/, N/sub 2/, O/sub 2/, CO/sub 2/, H/sub 2/Ovapor, CH/sub 4/, C/sub 2/H/sub 2/, C/sub 2/H/sub 4/, C/sub 2/H/sub 6/, C/sub 3/ H/sub 6/ , and C/sub 3/H/sub 8/ and the methods for their determination are discussed. The mean energy per ion pair for air is constant for beta, gamma, and x rays between 20 kev and 3 Mev; its value is W/sub air/ = (33.8 plus or minus 0.2) ev. In all the other energy ranges the results do not agree. Beyond 20 kev the value is W/sub air/ = (33.8 plus or minus 0.5) ev too using relative measurements. These values, however, are based on the assumption that W/sub argon/ = 26.35 ev is energy independent. . Also above 3 Mev there are significant differences in the resuits of the two different methods. There is no energy dependency of W/sub air/ when the total specific ionization is determined. However, W/sub air/ decreases to 33 ev when thimble chambers are used. The mean energy per ion pair for noble gases and hydrogen has probably the same value for electrons and alpha particles with energies above 20 kev. The influence of gas impurities on the resuits obtained with helium, neon, and argon is remarkable. (auth)
- Research Organization:
- Universitat, Gottingen, Ger.
- NSA Number:
- NSA-17-016086
- OSTI ID:
- 4727214
- Journal Information:
- Strahlentherapie (West Germany), Vol. Vol: 120; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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