RBE of Monoenergetic Fast Neutrons: Cytogenetic Effects in Maize

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Investigations on the relative biological effectiveness (RBE) of densely ionizing radiations (with high LET, rate of linear energy transfer) are of importance in both fundamental and applied radiobiology. In the latter, they serve as a basis in setting permissible exposure levels for types of radiation about which little long range experience is available. Some of the best RBE studies have been done on chromosomal aberrations. The difficulty is determining RBE on the basis of chromosomal exchanges or 2-break aberrations is that the dose-response curves differ for radiations of different LET and dose rate. The dose-squared term tends to predominate with … continued below

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Smith, H. H.; Bateman, J. L.; Quastler, H. & Rossi, H. H. November 13, 1963.

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Investigations on the relative biological effectiveness (RBE) of densely ionizing radiations (with high LET, rate of linear energy transfer) are of importance in both fundamental and applied radiobiology. In the latter, they serve as a basis in setting permissible exposure levels for types of radiation about which little long range experience is available. Some of the best RBE studies have been done on chromosomal aberrations. The difficulty is determining RBE on the basis of chromosomal exchanges or 2-break aberrations is that the dose-response curves differ for radiations of different LET and dose rate. The dose-squared term tends to predominate with radiations of low LET (such as γ rays and most X rays) and high doses or dose rates; the linear term dominates with high LET tracks in general and at low doses or dose rates. The shape of the curves is thought to reflect the existence of two classes of mechanisms by which chromosome exchanges are produced; exchanges caused by the passage of a single ionizing particle account for the linear component of the dose-response curve, exchanges due to the interaction of effects of two independent ionizing particles are responsible for the dose-squared component. This model has been amply confirmed by time-dose studies. The differences in shape of the dose-response curves indicate thus that with densely ionizing radiations, single particle events dominate the radiation response, while with sparsely ionizing radiations, events based on interaction of two or more particles play the leading role; hence the relative effectiveness of the kinds of radiations can not be the same for the two classes of mechanisms. Now the usual method of assessing RBE is based on comparing the doses which produce matching responses, i.e. equal amounts of effect, but at every response level both single action and interaction mechanisms contribute to the total response; the contribution of interaction mechanisms increasing with dose and dose rate, the more rapidly, the less the LET of radiation. Therefore, the RBE based on the total response will--and dose--give values which reflect the various contributions from the two types of mechanisms, and thus changes with response level.

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  • November 13, 1963

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  • Feb. 5, 2022, 9:59 a.m.

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Smith, H. H.; Bateman, J. L.; Quastler, H. & Rossi, H. H. RBE of Monoenergetic Fast Neutrons: Cytogenetic Effects in Maize, report, November 13, 1963; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1255906/: accessed July 17, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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