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Absolute Sensitivity of a Graphite Ionization Chamber

Melvin Lax*

  • Massachusetts Institute of Technology, Cambridge, Massachusetts

  • *This work was done while the author was employed at the Research Laboratory, General Electric Company, during the summer of 1946.
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Phys. Rev. 72, 61 – Published 1 July, 1947

DOI: https://doi.org/10.1103/PhysRev.72.61

Abstract

A thick-walled graphite ionization chamber is suggested as a simple instrument for measuring the total intensity in the x-ray beam emitted by the betraton. The chamber would consist of two layers of carbon, each about 1/5 of a radiation length, or 4.5 cm thick, separated by a thin gas layer whose width is not critical. The transverse dimensions of the carbon layers should be sufficiently large to cover completely the x-ray beam as well as to catch the electrons produced at an angle in the carbon. The absolute sensitivity of the ionization chamber is computed to an accuracy of about 5 percent by comparison with the ionization which would be produced in an infinitely thick carbon block.

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References (8)

  1. G. C. Laurence, Can. J. Research A15, 16 (1937)
  2. B. Rossi and K. Greisen, Rev. Mod. Phys. 13, 240 (1941)
  3. B. Rossi and K. Greisen, Rev. Mod. Phys. 13, 240 (1941) p. 247
  4. [3], p. 263
  5. L. H. Gray, Proc. Roy. Soc. A156, 578 (1936)
  6. [3], p. 251
  7. [3], p. 264
  8. [3], p. 256

Outline

Information

Phys. Rev. 72, 61– Published 1 July, 1947
  • Received 10 February 1947

© 1947 American Physical Society

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