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British Journal of Radiology (1976) 49, 458-462
© 1976 British Institute of Radiology
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The British Journal of Radiology, Vol 49, Issue 581 458-462, Copyright © 1976 by British Institute of Radiology

ARTICLES

Change in oxygen enhancement ratio with depth in tissue-equivalent material for a collimated beam of fast neutrons

RJ Berry and MA Bewley

Survival of reproductive capacity of murine leukaemia P-388 cells was assayed in vivo after the cells had been irradiated in vitro under aerobic or hypoxic conditions with collimated beams of X rays or 16 MeV D-Be fast neutrons at various depths in tissue-equivalent phantom material. The response to X-irradiation was the same in the absence of the phantom and at 8-7 cm depth. The response to fast neutrons under aerobic conditions was unchanged from 0 to 23 cm depth within the phantom. However, under hypoxic conditions, the dose-response curve for fast neutrons became significantly steeper with increasing depth in the phantom. The OER decreased from 2-0 in the absence of the phantom to 1-5 at 15 cm deep.




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