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British Journal of Radiology (1982) 55, 640-644
© 1982 British Institute of Radiology
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The British Journal of Radiology, Vol 55, Issue 657 640-644, Copyright © 1982 by British Institute of Radiology

ARTICLES

Radiobiological studies with therapeutic neutron beams generated by p+ leads to Be or d+ leads to Be

EJ Hall, M Zaider, R Bird, M Astor and W Roberts

Mammalian cells cultured in vitro were used to study the radiobiological characteristics of neutron beams generated by 43 MeV protons on beryllium or 25 MeV deutrons on beryllium. For an unfiltered beam of neutrons generated by 43 MeV p+ leads to Be the relative biological effectiveness was found to be 8-12% higher at a depth of 2 cm than at a depth of 12 cm due to the presence of a large component of low-energy neutrons. The addition of a hydrogenous filter 4 cm thick preferentially removed the low-energy neutrons from the beam and, as a result, the neutron RBE was independent of depth. There was no significant difference in the oxygen enhancement ratio between the filtered neutrons produced by 43 Mev p+ leads to Be and neutrons produced by 25 MeV d+ leads to Be; for both beams the OER value was about 1.6.




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