Abstract
The purpose of this investigation is the optimal use of Townsend's formula α p = A exp[ −B (K p) ] for the estimation of the gas amplification of avalanche counters. The gas constants, A and B, were determined by the parallel-plate avalanche counter (PPAC) method (Sernicki, Nucl. Instr. and Meth. A 288 (1990) 555), implemented at pressures ( p) successively increasing by 1 Torr. PPACs, filled with n-heptane vapour, were used. The optimal solution was chosen from the three very precisely determined (at different boundary conditions) variants of data on the first Townsend coefficient (α) of n-heptane in PPAC detectors. The chosen one is justifiable in the range of reduced electric field intensity ( K p ) values from 172.2 to 940 V/cm Torr, which includes the largest spans of applicable PPAC operating voltages. The results obtained were compared with the author's previous solutions (Sernicki, Nucl. Instr. and Meth. A 288 (1990) 555; Sernicki, Nukleonika 40 (4) (1995) 67).
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