The R.B.E. of Fission Neutrons, 250 kV X-rays, Cd(n, γ) and60Co Gamma-rays for Intestinal and Haemopoietic Deaths in Guinea-pigs

Publisher Website
Google Scholar
Abstract
A clearly defined intestinal syndrome was found in irradiated guinea-pigs. After irradiation with fission neutrons, X-rays, Cd(n, γ) or 60Co gamma-rays the LD50/6 was 755 rads, 1120 R, 1536 R and 1718 R respectively. The dose of radiation needed to produce haemopoietic damage was much less, and the corresponding LD50/30 values were 247 rads, 447 R, 493 R and 484 R, respectively. The LD50/30 was 7 per cent lower for dorso-ventral than ventrodorsal neutron-irradiation. R.b.e. values were slightly greater for intestinal than for haemopoietic deaths. The respective values were 2·3 and 2·0 for neutrons, 1·5 and 1·1 for 250 kV X-rays and 1·1 and 0·9 for Cd(n, γ) gamma-rays when compared with 60Co gamma-rays.