Dosimetric properties of p(90)+(Be+Ta) and p(101)+(Be+Al) neutrons

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Abstract
Dosimetric data were obtained for p(90) + (Be + Ta) and p(101) + (Be + Al) radiation with field size 9 .times. 11 cm at a 125-cm SSD [source-to-surface distance] impinging on a tissue-equivalent liquid phantom with density 1.10. The radiation was unfiltered or filtered by 10 cm of polyethylene. Dose rates measured with a 0.5-cm3 ion chamber at a depth of 5 cm ranged from 0.046 Gy[gray]/min .mu.A for filtered p(90) + (Be + Ta) to 0.11 Gy/min .mu.A for unfiltered p(101) + (Be + Al). Neutron time of flight energy spectra in air averaged above 10 MeV indicate mean neutron energies ranging from 42.0-51.4 MeV for the 4 beams under study. The central axis depths at which 50% dose attentuattion occurred ranged from 15 to 20 cm for these beams. At 3 cm depth the gamma dose component of the total p(101) + (Be + Al) dose was 14.5% or 17% with filtration. [These neutron beams were evaluated for their potential use in human cancer therapy.].
Funding Information
  • National Cancer Institute (CA‐18807)
  • National Institutes of Health

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