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PubMed1979

[Experimental study of the relative biological effectiveness (R.B.E.) of a fast neutron beam (author's transl)].

A preliminary experimentation has been done with the synchrocyclotron (28 MeV deuton) in Lyon. The different characteristics of the beam have been determined through various dosimetric measurements. C57Bl mice have been irradiated with single doses and fractionated schedules (5 sessions). 7 day survival has been analysed. Comparison of neutron and cobalt gamma ray shows a R.B.E. of 1.95 for single dose and 2.5 for five fractions. This work is a confirmation of the effect of fractionation on the R.B.E. of the neutrons.

Animals↗
PubMed1982

Comparison of the fast-neutron sensitivity of a Geiger-Müller counter using different techniques.

The sensitivity of an energy-compensated Geiger-Müller counter to neutrons with approximate energies of 0.6, 5 and 15 MeV, relative to its sensitivity to gamma rays (kU-value), has been determined at different centres in Europe. The time-of-flight, angular difference, associated-particle coincidence and lead filtration technique have been compared, using the same Geiger-Müller counter. For 15 MeV neutrons, a consistent kU-value of 1.9% was obtained. For the lower neutron energies, lower kU values were observed with reasonable agreement.

Fast Neutrons↗