Discharges of 14C from Nuclear Facilities; Implication in environmental science.

Iwakura, Tetsuo

doi:10.3327/jaesj.35.874

Cited by 1 publication

(1 citation statement)

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“…In the nuclear plants, 14 C is generated by a thermal neutron interaction with N, O and C in coolants, moderators, fuels and constructional materials (1) . In decommissioning graphite reactor particularly, reduction of discharging 14 C is important.…”

Section: Introductionmentioning

confidence: 99%

Radioactive Carbon Isotope Monitoring System Based on Cavity Ring-down Laser Spectroscopy for Decommissioning Process of Nuclear Facilities

Tomita

Watanabe

Takiguchi

et al. 2008

JPES

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In decommissioning process of nuclear facilities, large amount of radioactive isotopes are discharged as waste. Radioactive carbon isotope (14 C) is one of the key nuclides to determine the upper limit of concentration in the waste disposal. In particular, 14 C on the graphite reactor decommissioning should be separated from stable carbon isotopes (12 C and 13 C) and monitored for the public health and safety. We propose an isotope analysis system based on cavity ring-down laser spectroscopy (CRDS) to monitor the carbon isotopes (12 C, 13 C and 14 C) in the isotope separation process for the graphite reactor decommissioning. This system is compact and suitable for a continuous monitoring, because the concentration of molecules including the carbon isotope is derived from its photo absorbance with ultra high sensitive laser absorption spectroscopy. Here are presented the necessary conditions of CRDS system for 14 C isotope analysis through the preliminary experimental results of 13 C isotope analysis with a prototype system.

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Section: Introductionmentioning

confidence: 99%