Letter | Published:

Electron Transfer in Irradiated Vacuum Cavity Chambers

Nature volume 204, pages 563564 (07 November 1964) | Download Citation

Subjects

Abstract

GREENING1 has explained the residual current in an ionization chamber, when the pressure is reduced to very low values, in terms of the transfer of slow electrons between the electrodes. He has proposed a theory for the saturation characteristics of evacuated chambers under irradiation. On the basis of a review of experimental data, he suggested an electron energy spectrum emitted from the walls, namely, the low-energy part of the electron spectrum from 0–41 eV could be represented by KE½eE/8 per unit energy interval and the high-energy part of the electron spectrum from 41–∞eV by per unit energy interval, where E is the electron energy and K is a constant. Generally it is necessary to know the directional distribution of the electrons emerging from the wall before the saturation characteristic of a vacuum chamber can be calculated from Greening's theory. Notwithstanding this, it is possible to calculate the saturation characteristics of a spherical vacuum chamber without any knowledge of the directional distribution of the electron emitted from the walls, because of the threefold symmetry in this case. A spherical vacuum chamber, with the radii of the inner and outer electrodes being 3.13 cm and 5.08 cm respectively, has been constructed and a theoretical saturation characteristic calculated, using the electron energy spectrum suggested by Greening, and is represented by the curve labelled A in Fig. 1.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1.

    , Brit. J. Radiol., 27, 163 (1954).

  2. 2.

    , Brit. J. Radiol., 24, 67 (1951).

Download references

Author information

Affiliations

  1. Department of Mathematics and Physics, The Polytechnic, 309 Regent Street, London, W.1.

    • T. E. BURLIN
    •  & S. R. HUSAIN

Authors

  1. Search for T. E. BURLIN in:

  2. Search for S. R. HUSAIN in:

About this article

Publication history

Published

DOI

https://doi.org/10.1038/204563b0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.