Emission characteristics of gadolinium ions in a water Cherenkov detector

水チェレンコフ検出器におけるガドリニウムイオンの発光特性

岩田 圭弘   ; 関谷 洋之*; 伊藤 主税   

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

本研究では、レーザー誘起発光分光をベースとした実験装置を構築し、水中Gdイオンの発光特性を調査した。励起波長を245-255nmの範囲で変えたところ、波長246.2nm及び252.3nmで共鳴ピークを観測し、発光寿命は3ms程度であった。Gd濃度と発光量に良い直線性が得られ、構築した実験装置がGd濃度の遠隔モニターにも有用であると考えられる。

In this work, we constructed an experimental setup based on time-resolved laser-induced luminescence spectroscopy to investigate the emission characteristics of Gd ions in water. The excitation laser wavelength was tuned in the range of 245-255 nm, and large resonant peaks were observed at 246.2 nm and 252.3 nm with measured emission lifetimes of around 3 ms. Good linearity was observed between Gd concentration and emission intensity for these two wavelengths, indicating that our setup is useful for remote monitoring of Gd concentration.