A study on a quantitative analysis of nitrogen was made using gamma ray spectrometry. A given amount of aluminum oxide was employed as a calibration substance. 14 MeV neutron irradiation to the mixture of (NH4) 2SO4and Al2O3leads mainly to14N (n, 2n) 13N, 27Al (n, p) 27Mg, and27Al (n, α) 24Na reactions. The ratios of the partial full energy peaks of 0.51MeV annihilation gamma rays due to13N to those of 0.84 MeV gamma rays from27Mg were found to be completely proportional to the amount-of nitrogen added to a given amount of aluminum. Hence, nitrogen contained in certain materials can be analyzed quantitatively by the use of the relationship above obtained. Quantitative analysis of nitrogen in gluten was accomplished with around 4% error.
Electrolysis with glassy-carbon electrodes was employed as a preliminary separation step prior to thermal neutron irradiation. Low parts per billion of gold in cadmium metal was electrodeposited on a glassy-carbon cathode from hydrochloric acid-nitric acid solution in greater than 90% yields, leaving about 99.999% of cadmium in the electrolyte. The golddeposited electrodes were then irradiated in a nuclear reactor. About 6 parts per billion of gold was found in a sample of commercial high-purity cadmium metal (purity 99.999%) .
Mechanism of radioprotective action of Tween 80, the most effective radioprotector for E, coli B/r in aerated condition among water soluble non-ionic surfactants, was investigated. Experimental results show that the protective effects of Tween so depend mostly on polyoxyethylene groups and slightly on sorbitol moiety. In the presence of 0.06 M of MEA, protective effects of Tween 80 are not additive but rather competitive. In spite of good protection for B/r, Tween 80 does not protectBs-1. This strain specific property suggests the action of Tween 80 will possibly concern to the repair systems rather than DNA itself.