Author： Charlton D. E. Utteridge T. D. Allen B. J.
Publisher： Informa Healthcare
ISSN： 1362-3095
Source： International Journal of Radiation Biology, Vol.74, Iss.1, 1998-07, pp. : 111-118
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Abstract
Purpose: To calculate survival of human haemopoietic stem cells irradiated by alpha particles from 149Tb (initial energy 3.97 MeV) and 211 At (average initial energy 6.87 MeV). Methods: Following as closely as possible radiobiological data, Monte Carlo methods were used to calculate passages of alpha particles (originating in three geometries) through the nuclei of haemopoietic stem cells. Survival of stem cell populations was calculated from the probability of surviving each passage (a function of LET). Results: For decays targeted to the surface of individual cells 37% survival was found at 1.3 passages per nucleus for 149Tb and 6.5 for 211At/Po decays. For decays distributed in a large volume the D0 doses were 0.81 and 0.87 for 149Tb and 211At respectively. When 36% of the marrow is occupied by fat cells alphas from 149Tb are more effective with a D0 of 0.68 Gy compared to 0.82 Gy for the 211At/Po combination. Conclusions: When the isotopes are targeted to the cell, in terms of passages, 149Tb is five times more effective at cell killing than 211 At, which when expressed in terms of dose, increases to a factor of 9. When the isotopes are broadly distributed (such as in marrow or in vitro ) the differences are considerably reduced.
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