Evolution of iodine from $NaI-Na_2 O_2$ System

The evolution of radioiodine 131I from a sodium peroxide system as a function of time, temperature, and carrier gas (nitrogen) flow rate was studied. Virtually no iodine was volatilized at 25$0^{\circ}C$ and a very small amount, of the order of 10$^{-3}$ % per flour, at 63$0^{\circ}C$. Substantially greater amounts of iodine were volatilized at 7$25^{\circ}C$ and 83$0^{\circ}C$. The data are consistent with the hypothesis that the mechanism of transfer is distillation of sodium iodide, and that elemental iodine is not produced in this system.

Sodium을 냉각제로 사용하는 증식원료로계(LMFBR)에서 원자로의 정상, 비정상 가동하에서 Sodium 또는 Sodium화합물과 핵분열물질의 하나인 기체상 I$^{131}$ 의 역활은 장해도평가에 중요한 요인이 된다. 본 실험에서는 Sodium peroxide계에서 시간, 온도, flow rate에 따른 I$^{131}$ 의 방출과정을 규명하였음.