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Tissue doses of fast and ultra-fast neutrons

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The Soviet Journal of Atomic Energy Aims and scope

Abstract

An investigation has been carried out of depth doses in irradiation of tissue-like dummies (water, paraffin) with broad beams of fast and ultra-fast neutrons generated in the 1.5 meter cyclotron by bombarding a thick beryllium target with deuterons accelerated to 13 Mev (the reaction Be9 (d, n)B10) in the six-meter synchrocyclotron by bombarding a thick copper target with deuterons accelerated to 280 Mev (deuteron stripping reaction), and in the six-meter synchrocyclotron by bombarding a beryllium target with protons having an enervy of 480 Mev (proton charge-exchange reaction).

The results of the investigation, when applied to the case of irradiation of tissue with narrow and broad beams of monoenergetic neutrons, permit conclusions to be formed concerning depth doses with any spectrum of neutrons, and make possible the calculation of the mean tissue dose that can be used in comparative radiobiology. Moreover, data on attenuation of the dose of neutrons of various energies in hydrogen- containing media may be of help to the engineer in the construction of shielding.

Experimental and theoretical curves of the variation of the maximal tissue dose with hardness were obtained for broad and narrow neutron beams in the energy interval 0.1–500 Mev. These curves can be used for calibrating dosimeters.

Views are expressed concerning methods of approach to evaluation of the biological effectiveness of nuclear radiations, and to establishing the maximum permissible dose for man.

Tentative values are given for the maximum permissible neutron fluxes for man.

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Authors
  1. M. I. Shal'nov
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Shal'nov, M.I. Tissue doses of fast and ultra-fast neutrons. The Soviet Journal of Atomic Energy 4, 735–749 (1958). https://doi.org/10.1007/BF01515401

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  • DOI: https://doi.org/10.1007/BF01515401

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