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Sigdestad, C.P. et al.

A comparison of radioprotection from three neutron sources and 60Co by WR-2721 and WR-151327.

Two thiophosphoroate radiation protectors (WR-2721 and WR-151327) were assessed for their ability to modify the effects of neutron or gamma irradiation on the gastrointestinal tract. Three neutron sources (DOSAR, JANUS, and FERMILAB) were compared to the response obtained after 60Co irradiation. The end points studied were intestinal stem cell survival and LD50(6). DOSAR and JANUS, both fission-spectrum neutrons, showed somewhat different gut sensitivities [LD50(6)] of about 240 and 400 cGy respectively. The intestinal LD50 obtained with FERMILAB neutrons (25 meV) was closer (875 cGy) to that obtained after 60Co (1068 cGy) irradiation. WR-151327 protected against the lethal effects of fission neutron (DOSAR and JANUS) to a greater degree (DMF = 2.2) than with lower LET sources such as FERMILAB neutrons (DMF = 1.7) or 60Co (DMF = 1.7). The results did not correlate with the intestinal stem cell assays where WR-2721 when compared to WR-151327 showed either similar (DOSAR; fission spectrum neutrons) or somewhat better (60Co and FERMILAB neutrons) protection. Possible explanations for the differing results are discussed.[1]

References

A comparison of radioprotection from three neutron sources and 60Co by WR-2721 and WR-151327. Sigdestad, C.P., Grdina, D.J., Connor, A.M., Hanson, W.R. Radiat. Res. (1986) [Pubmed]

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