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Ware, Anthony Ronald (1965) Nature of phosphorus-32 produced by neutron irradiation of sulphur. Doctoral thesis, Sir John Cass College.
The reports of the nature of phosphorus produced by neutron irradiation of sulphur are based mainly upon the chemical form found after extraction of the phosphorus from the target. This has resulted in a difference of opinion, probably due to varying irradiation conditions and extraction methods, which have generally been vigorous. During this work, irradiation conditions were kept constant and much milder extraction processes were developed.
The phosphorus-containing residues were examined by micro-chemical analysis, precipitation experiments, chromatography, adsorption and volatility studies. The possibility that phosphorus sulphides were formed in irradiated sulphur was disproved, by comparison of the chemical behaviour of irradiated sulphur with mixtures of active phosphorus and sulphur, and known phosphorus sulphides. The presence of phosphates and other phosphorus compounds was investigated, but all the evidence pointed to the formation of an ortho-phosphate salt during irradiation. In certain circumstances, this appeared to be aluminium phosphate.
The phosphorus-32 was shown by means of absorption and decay curves, and beta spectrometry, to be contaminated with 1% of phosphorus-33 at the end of the irradiation period.
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