悬臂增强光声法测量水蒸气中的氚化水

Karhu Juho, Nyman Markus, Siitari-Kauppi Marja, Hieta Tuomas

Metrology Research Institute, Aalto University, Maarintie 8, Espoo, 02150, Finland.

Department of Chemistry, University of Helsinki, P.O. Box 55, Helsinki, 00014, Finland.

Photoacoustics. 2022 Dec 30;29:100443. doi: 10.1016/j.pacs.2022.100443. eCollection 2023 Feb.

A photoacoustic detection of tritiated water (HTO) is presented. The method uses cantilever-enhanced photoacoustic spectroscopy (CEPAS) to reach sub-ppb sensitivity for HTO in the gas phase. A noise equivalent concentration of 0.88 ppb is reached with a sampling time of 1 min. The high performance and small sample volume of CEPAS allows sensitive detection of HTO from a sample with low total activity.

本文介绍了一种用于检测氚化水（HTO）的光声检测方法。该方法采用悬臂增强光声光谱法（CEPAS），可实现气相中HTO的亚ppb级灵敏度检测。在1分钟的采样时间下，噪声等效浓度达到0.88 ppb。CEPAS的高性能和小样本量使得能够从总活度较低的样本中灵敏地检测出HTO。