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- W1997644328 abstract "Renal damage in the mouse was assessed after irradiation with p(62)-Be neutrons from the cyclotron at Clatterbridge, U.K., and compared with the renal response to d(16)-Be neutrons. One, 2, 4 and 8 fractions of radiation were given, or 8 low-dose fractions followed by a top-up dose of d(4)-Be neutrons at the Gray Laboratory. The use of both full course fractionation and the top-up technique in this study allowed ratios of isoeffective neutron dose at the two energies (NDR) to be measured over a wide range of neutron dose per fraction from 0.2 to 9.6 Gy. NDR (neutron dose ratio) is a direct way to specifying the relative RBE's of the two neutron beams. Radiation injury in the kidney was assayed with three methods: clearance of [51Cr]EDTA, reduction in haematocrit, and urine output. The dose-response curves obtained were resolved best at 31 weeks post-irradiation in these experiments. All three assays gave similar results. NDR was roughly constant at approximately 1.38 over the complete dose range. For equal effects in the kidney, the standard Hammersmith protocol for d(16)-Be neutrons of 17.6 Gy (N + gamma dose) given in 12 fractions would require 24.6 Gy in 12 fractions using the p(62)-Be beam at Clatterbridge. NDR for renal damage was greater than the NDR obtained previously for mouse skin (1.1-1.2) at all doses, indicating that kidneys would be spared in fractionated treatments with p(62)-Be neutrons compared with d(16)-Be neutrons if radiation doses were given to the same skin tolerance. Examination of the RBE of the two neutron beams relative to 240 kVp X-rays showed that this reflects a lower RBE compared with skin for p(62)-Be neutrons in the clinical dose-range, and a higher RBE compared with skin for d(16)-Be neutrons. These radiobiological data therefore favour the use of high energy neutron therapy if kidneys are included in the field, but this conclusion should not be extrapolated to other late responding normal tissues for which further experimental data should be accrued." @default.
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- W1997644328 date "1988-11-01" @default.
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- W1997644328 title "A comparison of the effects of p(62)-Be and d(16)-Be neutrons in the mouse kidney" @default.
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- W1997644328 doi "https://doi.org/10.1016/0167-8140(88)90058-8" @default.
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