Determination of Li generated from 10B(n·α)7Li reaction in Boric acid solution

붕산수용액에서 10B(n·α)7Li 핵반응에 의해 생성된 Li 정량

  • 최계천 (한국원자력연구소, 원자력화학연구부) ;
  • 정용주 (한국원자력연구소, 원자력화학연구부) ;
  • 연제원 (한국원자력연구소, 원자력화학연구부) ;
  • 김원호 (한국원자력연구소, 원자력화학연구부)
  • Received : 2003.09.18
  • Accepted : 2003.11.27
  • Published : 2003.12.25

Abstract

Thermal neutron irradiation experiment of boric acid solution was carried out using HANARO in following three conditions: (A) $^{10}B$ concentration = $203.0{\mu}g/mL$, irradiation time = 1 hr; (B) $^{10}B$ concentration = $381.4{\mu}g/mL$, irradiation time = 1 hr; (C) $^{10}B$ concentration = $381.4{\mu}g/mL$, irradiation time = 0.5 hr. The amount of lithium produced from $^{10}B(n{\cdot}{\alpha})^7Li$ reaction which was generated on neutron irradiation, was measured by flameless atomic absorption spectroscopy. The concentration of $^7Li$ measured in the three experiments was $0.18{\mu}g/mL$ (78.3% of theoretical value, $0.23{\mu}g/mL$) in (A), $0.31{\mu}g/mL$ (70.5% of theoretical value, $0.44{\mu}g/mL$) in (B) and $0.16{\mu}g/mL$ (71.6% of theoretical value, $0.22{\mu}g/mL$) in (C). The pH value of irradiated boric acid was shifted to considerably low. It is estimated that boric acid would be transformed into the polyborate fonn, by radiolysis products of water, which has high dissociation constant.

Acknowledgement

Supported by : 과학기술부

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