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The determination of the value W¯ energy per ion pair for tissue equivalent media the energy dependence of W¯ and the value for fission fragments from Cf-252.

Nutton, David H. (1979) The determination of the value W¯ energy per ion pair for tissue equivalent media the energy dependence of W¯ and the value for fission fragments from Cf-252. Doctoral thesis, University of Surrey (United Kingdom)..

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Abstract

The application of the value W, the mean energy expended in the production of an ion-pair, to the ionometric dosimetry of neutron radiation as applied to radiotherapy is discussed. The concept of tissue equivalence is developed and the limitations of its application evaluated; The value of W for alpha particles from Americium-241 in several gases, including two tissue equivalent gases, were measured using a total ionisation current technique. The effect of a dependence of W upon energy, mass and charge is discussed. Protons in the energy range 300 kev to 1.7 MeV were used in order to evaluate any energy dependence of W in an Argon plus Methane gas mixture over that energy range. A dependence was observed, amounting to 17% at 500 Kev compared to the value at 1.7 MeV. Additionally an inversion in the trend as the energy was reduced below 450 KeV was observed. A high mass experiment is described using fission fragments from a Californium-252 source in an Argon plus Methane gas mixture.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
NameEmailORCID
Nutton, David H.
Date : 1979
Contributors :
ContributionNameEmailORCID
http://www.loc.gov/loc.terms/relators/THS
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1979.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 14:25
Last Modified : 06 Nov 2018 16:53
URI: http://epubs.surrey.ac.uk/id/eprint/847853

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