J. M. Thoday
Articles written in Journal of Genetics
Volume 43 Issue 1-2 January 1942 pp 189-210
1. Neutrons produce qualitatively the same types of chromosome aberrations as X-rays, but more of all types of aberration are produced, per ionization, by neutrons.
2. The ratios of the dose of X-rays to the dose of neutrons both measured in roentgens, required to produce equal numbers of aberrations are 2-4 for chromatid breaks, 3-6 for isochromatid rejoins, 4-5 for chromosome breaks, and from 10 to 5, at the doses used, for interchanges.
3. Many of the interchanges produced by neutrons are caused by single ‘hits’, that is by single ionization paths.
4. Neutrons and X-rays do not differ in any effects that they may have on the rejoining process.
5. The results are attributed to the greater number of primary breaks, and their different distribution, when they are produced by the denser ionization paths of neutron radiation.
6. It must be inferred that more than one ionization is needed to break a
Volume 47 Issue 2 January 1946 pp 113-136
Volume 47 Issue 2 January 1946 pp 137-149
Volume 54 Issue 3 November 1956 pp 456-461
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