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dc.contributor.authorChen, Fu-Du
dc.contributor.authorHendry, Jolyon H
dc.contributor.authorChu, G L
dc.contributor.authorGreene, D
dc.contributor.authorBianchi, M
dc.date.accessioned2014-12-09T12:09:27Z
dc.date.available2014-12-09T12:09:27Z
dc.date.issued1983-08
dc.identifier.citationThe RBE of the leakage radiation from the Hiletron neutron therapy unit. 1983, 56 (668):551-8 Br J Radiolen
dc.identifier.issn0007-1285
dc.identifier.pmid6409200
dc.identifier.urihttp://hdl.handle.net/10541/336977
dc.description.abstractThe RBE of the leakage radiation from the Hiletron 14.7 MeV neutron therapy unit has been measured using three sensitive biological systems in mice, which differ markedly in their radiobiological characteristics. These systems comprise type A spermatogonia and bone marrow stem cells, which are affected insignificantly by dose rate, and pigment abnormalities in hair follicles which are affected markedly by dose rate. For mice irradiated at 10 cm depth in a water phantom, the leakage radiation up to 40 cm from the beam axis was virtually as effective as the primary beam for the latter two biological systems, and for spermatogonia in mice when irradiated in air. At this distance, the total dose rate was about 0.2 cGy (rad) per minute (3% of that in the primary beam), and the gamma-ray component was about 70%. This equal effectiveness of the total dose for all three systems was considered fortuitous, and it implied high RBE values for equal effect with the small neutron component at far distances. Considering published data on RBE versus neutron energy, the evidence suggested either a positive interaction of neutron and gamma-ray components in killing bone marrow stem cells when the neutron component was less than 40% of the total dose, or an increased efficiency of neutrons when delivered at very low dose rates. However the components were additive in killing spermatogonia.
dc.language.isoenen
dc.rightsArchived with thanks to The British journal of radiologyen
dc.subject.meshAir
dc.subject.meshAnimals
dc.subject.meshBone Marrow
dc.subject.meshHair
dc.subject.meshMale
dc.subject.meshMice
dc.subject.meshNeutrons
dc.subject.meshRadiation Dosage
dc.subject.meshRadiation Injuries, Experimental
dc.subject.meshRadiotherapy, High-Energy
dc.subject.meshRelative Biological Effectiveness
dc.subject.meshSpermatogonia
dc.subject.meshWater
dc.titleThe RBE of the leakage radiation from the Hiletron neutron therapy unit.en
dc.typeArticleen
dc.contributor.departmentPaterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester.en
dc.identifier.journalBritish Journal of Radiologyen
html.description.abstractThe RBE of the leakage radiation from the Hiletron 14.7 MeV neutron therapy unit has been measured using three sensitive biological systems in mice, which differ markedly in their radiobiological characteristics. These systems comprise type A spermatogonia and bone marrow stem cells, which are affected insignificantly by dose rate, and pigment abnormalities in hair follicles which are affected markedly by dose rate. For mice irradiated at 10 cm depth in a water phantom, the leakage radiation up to 40 cm from the beam axis was virtually as effective as the primary beam for the latter two biological systems, and for spermatogonia in mice when irradiated in air. At this distance, the total dose rate was about 0.2 cGy (rad) per minute (3% of that in the primary beam), and the gamma-ray component was about 70%. This equal effectiveness of the total dose for all three systems was considered fortuitous, and it implied high RBE values for equal effect with the small neutron component at far distances. Considering published data on RBE versus neutron energy, the evidence suggested either a positive interaction of neutron and gamma-ray components in killing bone marrow stem cells when the neutron component was less than 40% of the total dose, or an increased efficiency of neutrons when delivered at very low dose rates. However the components were additive in killing spermatogonia.


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