Abstract
KODAK Nuclear Track plates of type NTP 2, 30 µ in thickness, have been exposed in a low-resolution β-ray spectrograph using uniform magnetic fields of 279 and 302 oersteds. The focused line had a half-breadth of about 1 mm. The rays entered the plate at a grazing angle, the central ray meeting the plate at 6°. Line sources of thorium (B + C) and radium E were used to provide continuous spectra. Exposure times were such as to give, in the 80-keV. energy region, about 2 × 105 β-rays per sq. cm. on a surface normal to the central ray. The plates were developed for 20 min. at 18° C. in Kodinol developer.
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Tsien San-Tsiang, Marty, C., and Dreyfus, B., J. Phys. et le Rad., 8, 269 (1947).
Tsien San-Tsiang, Ann. de Physique, 19, 327 (1944).
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ROSS, M., ZAJAC, B. Range-Energy and other Relations for Electrons in Kodak Nuclear Plates. Nature 162, 923 (1948). https://doi.org/10.1038/162923a0
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DOI: https://doi.org/10.1038/162923a0
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