Abstract
IN a recent letter1, Dr. Alfvén of Uppsala has described a method for measuring the ionisation along the track of individual-particles. Some years ago, an almost identical method was developed in this laboratory2 (Fig. 1) and has been used for the investigation of the rays from radium and polonium3. The main difference between this mothod and that developed in Uppsala appears to be that, thanks to the oblique direction of the rays to the field, with tho former method complications from different saturation are largely eliminated. Also the loss of ions to the grid is avoided by the application of a suitable potential. We have, however, of late abandoned this method for others giving more accurate results; namely, for the counting of particles and H-particles the ” Doppel Röhren-elektrometer”4, and for exact measurements of the From specific ionisation along individual-tracks the method recently published by G. Stetter and W. Jentschke5, also using a twofold registration.
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References
NATURE, 136, 60, July 13, 1935.
G. Stetter, Phys. Z., 33, 294; 1932.
H. Dannbauer, Dissertation, Universität Wien.
G. Stetter u. J. Sehintlmeister, Wien. Ber., 142, 427; 1933. Mitt. Rad.-lnst., No. 322.
G. Stetter u. J. Sehintlmeister, Phys. Z., 36, 441; 1936.
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STETTER, G. Registration of the Ionisation Curve of a Single -Particle. Nature 136, 394 (1935). https://doi.org/10.1038/136394a0
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DOI: https://doi.org/10.1038/136394a0
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