Abstract
EXAMINATION of the literature having shown absence of information on the Joshi effect under radioactive emanations, a detailed investigation was made employing, in the first instance, a β-ray capsule with negligible γ-ray activity. Siemens ozonizer type tubes charged with various vapours and gases and excited by commercial-frequency potentials of kilovolts were used. In agreement with results obtained with visible1 and ultra-violet2 radiation and with X-rays3–6, and employing especially organic vapours, an exposure to β-rays caused an instantaneous and reversible positive effect + Δi at relatively low voltage; with slight increase of voltage, + Δi diminished sharply; and finally changed over to − Δi above Vm, the threshold for a ‘self-maintained’ discharge. Thus, for example, cyclohexane vapour showed under β-rays about 150 per cent positive Joshi effect at 4 kV.; + 9.5 per cent and − 5.8 per cent at 6 and 8 kV. respectively.
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References
Joshi, Pres. Addr., Ind. Sci. Cong., Chem. Sec. (1943).
Joshi, Curr. Sci., 14, 317 (1945).
Joshi, Curr. Sci., 13, 278 (1944).
Bhide, Curr. Sci., 20, 178 (1951).
Bhiday, Proc. Ind. Sci., Phys. Soc. Abst. 58 (1950); Abst. 41 (1952).
Asolkar, Proc. Ind. Sci., Chem. Sec. Abst. 70 (1951); Abst. 71 (1952).
Joshi, cf. Ramaiah, A. N., J. Sci. and Indust. Res., 10A, 182 (1951).
Korff, “Electron and Nuclear Counters” (Van Nostrand, 1946).
Arnikar and Naqvi, Proc. Ind. Sci., Phys. Sec. Abst., 20 (1951).
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BHIDE, V., BHIDAY, M. & ASOLKAR, G. Production of the Joshi Effect under β- and γ-Rays. Nature 169, 542–543 (1952). https://doi.org/10.1038/169542b0
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DOI: https://doi.org/10.1038/169542b0
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