Modification of the 50% maximum dose depth for 41‐MeV (  p  + ,Be) neutrons by use of filtration and/or transmission targets | Zendy

Smathers J. B. | Zendy; Graves R. G. | Zendy; Earls L. | Zendy; Otte V. A. | Zendy; Almond P. R. | Zendy

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Modification of the 50% maximum dose depth for 41‐MeV ( p + ,Be) neutrons by use of filtration and/or transmission targets

Author(s) -

Smathers J. B.,

Graves R. G.,

Earls L.,

Otte V. A.,

Almond P. R.

Publication year - 1982

Publication title -

medical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.473

H-Index - 180

eISSN - 2473-4209

pISSN - 0094-2405

DOI - 10.1118/1.595132

Subject(s) - beryllium , neutron , percentage depth dose curve , dosimetry , dose rate , materials science , radiation , radiochemistry , proton , filtration (mathematics) , equivalent dose , spectral line , cobalt 60 , neutron temperature , nuclear medicine , irradiation , nuclear physics , physics , chemistry , ionization chamber , mathematics , ionization , medicine , ion , statistics , quantum mechanics , astronomy

Several target configurations for the 41‐MeV ( p + ,Be) reaction have been evaluated for the characteristics of the radiation field produced; depth dose, dose rate per μA. From analysis, it is concluded that to achieve the desired 13.2‐cm depth for 50% of maximum dose and acceptable dose rate at a target‐to‐skin distance (TSD) of 125–150 cm, the neutron spectra must be filtered to preferentially absorb the lower‐energy neutrons. Further increases in depth of 50% of maximum dose and a significant reduction in beryllium heating problems result if a partial transmission target is used with the terminal 30% of proton energy being deposited in a copper target backing.

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