講演情報
[2B10]Development of a Cavity Ring-Down Spectroscopy Instrument for Iodine Isotope Analysis.
*Luc BERNARD1, Menglin LI1, Shuichi HASEGAWA1, Chao ZHANG1, Ryohei TERABAYASHI3, Fumiko YOSHIDA2, Yukiko KUSANO2 (1. UTokyo, 2. NUMO, 3. Nagoya Univ.)
キーワード：
Cavity Ring-Down Spectroscopy、Iodine Isotopes、Absorption spectrum、Groundwater
Radioactive iodine isotopes in groundwater pose significant environmental and public-health concerns. Released through nuclear activities or medical waste, isotopes such as I-129 or I-131 must be carefully monitored to ensure environmental safety.
Techniques such as ICP-MS, AMS, and LSC each offer advantages in terms of sensitivity, measurement speed, and precision, but no single method successfully combines all these strengths. The aim of this research is to develop an instrument capable of quantifying trace concentrations of iodine isotopes in groundwater.We constructed a cavity absorption cell and measured the laser intensity decay after abruptly switching off the beam, allowing us to extract the relative absorption spectrum of iodine.
The measured spectrum was compared with simulations generated using IodineSpec5, showing good agreement. After subtracting background signals across different sample concentrations, we derived absorption coefficients that exhibit clear linearity with concentration.
Techniques such as ICP-MS, AMS, and LSC each offer advantages in terms of sensitivity, measurement speed, and precision, but no single method successfully combines all these strengths. The aim of this research is to develop an instrument capable of quantifying trace concentrations of iodine isotopes in groundwater.We constructed a cavity absorption cell and measured the laser intensity decay after abruptly switching off the beam, allowing us to extract the relative absorption spectrum of iodine.
The measured spectrum was compared with simulations generated using IodineSpec5, showing good agreement. After subtracting background signals across different sample concentrations, we derived absorption coefficients that exhibit clear linearity with concentration.