[10p-N206-1~13] 2.2 Radiation physics fundamentals & applications, radiation generators, new technology

△ [10p-N206-4] Investigation of Quantum pH Sensing Technology Using Angular Correlation Changes of Cascade Nuclides

〇Fumiki Sensui¹, Mizuki Uenomachi², Kenji Shimazoe^1,3, ZHIHONG ZHONG¹, Kei Kamada⁴, Hideki Tomita^3,5, Hiroyuki Takahashi¹ (1.Tokyo Univ., 2.RIKEN, 3.PRESTO-JST, 4.Tohoku Univ., 5.Nagoya Univ.)

Keywords:Quantum Sensing, Angular Correlation, Cascade Nuclide

Nuclides that emit multiple gamma rays simultaneously in the decay process are called cascade nuclides. The angle of emission of multiple gamma-rays in cascade decay is not random, but has an angular correlation depending on the local environment of the nuclide. In this study, we propose and investigate a new quantum sensing method to detect the pH and chemical state around radioisotopes by measuring the angular correlation changes of cascade nuclides. In order to verify the principle, we measured the angular correlation change of ¹¹¹InCl₃aqueous solution in different pH environments, and observed a 5% increase in the emission near 180 degrees and a 5% decrease in the emission near 90 degrees in environments with pH above 3. By measuring multiple samples simultaneously, we succeeded in separating the pH information of the solution, which could not be captured visually, from the measurement of angular correlation changes.