Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-06T10:50:04.282Z Has data issue: false hasContentIssue false
  • English
  • Français

The ‘thick-film chamber’ method for the measurement of fast neutron flux

Published online by Cambridge University Press:  24 October 2008

K. W. Allen  and
D. H. Wilkinson
K. W. Allen
Affiliation:
Cavendish LaboratoryCambridge
D. H. Wilkinson
Affiliation:
Cavendish LaboratoryCambridge
Get access Rights & Permissions [Opens in a new window]

Extract

Several methods have been developed in recent years in the Cavendish Laboratory for the absolute measurement of fast neutron flux. All depend on observing the effects of elastic collisions between neutrons and light nuclei. The methods fall into two categories according as individual recoil nuclei are counted (1, 2), or the total ionization current due to the recoils is measured (3). In order completely to interpret the experimental results, it is necessary to know the cross-section for scattering and the angular distribution of the recoil nuclei. The total number of recoil nuclei and their energy distribution are then determined for a known incident neutron spectrum. For precise neutron flux measurements, recoil protons are invariably studied, as the neutron-proton scattering cross-section has been measured over a wide range of energies (4, 5), and the angular distribution of the recoils is isotropic in the centre of gravity space for neutrons of energy less than about 10 MeV. (6, 7). This makes the reduction of the experimental results particularly simple and certain.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 44 , Issue 4 , October 1948 , pp. 581 - 587
Copyright
Copyright © Cambridge Philosophical Society 1948

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1)Kinsey, B. B., Cohen, S. G. and Dainty, , J. Proc. Cambridge Phil. Soc. 44 (1948) 96.CrossRefGoogle Scholar
(2)Allen, K. W. (To be published.)Google Scholar
(3)Bretscher, E. and French, A. P. (To be published.)Google Scholar
(4)Bretscher, E. and Murrell, E. B. M. (To be published.)Google Scholar
(5)Bailey, C. L., Bennett, W. E., Bergstralh, T., Nuckolls, R. G., Richards, H. T. and Williams, J. H.Phys. Rev. 7 (1946), 583.CrossRefGoogle Scholar
(6)Dee, P. I. and Gilbert, C. W.Proc. Roy. Soc. A, 163 (1937), 265.Google Scholar
(7)Champion, F. C. and Powell, C. F.Proc. Roy. Soc. A, 183 (1944), 64.Google Scholar
(8)Feather, N.Br Report (1944).Google Scholar
(9)Wilkinson, D. H.Proc. Cambridge Phil. Soc. 44 (1948), 114.CrossRefGoogle Scholar
(10)Livingston, M. S. and Bethe, H. A.Rev. Mod. Phys. 9 (1937), 274.CrossRefGoogle Scholar
(11)Livesey, D. L. and Wilkinson, D. H.Proc. Roy. Soc. (In course of publication.)Google Scholar
(12)Coon, J. H. and Barschall, H. H.Phys. Rev. 70 (1946), 592.CrossRefGoogle Scholar
(13)Allen, K. W., Livesey, D. L. and Wilkinson, D. H. (To be published.)Google Scholar