On-Line Measurement of High Concentration Tritium Based on BIXS Method

The high concentration tritium on-line measurement in tritium processing system requires the detector to have the characteristics of small volume, good sealing and high stability. Therefore, the on-line tritium measurement system is estabilished based on β-ray induced X-ray spectrometry(BIXS) in this paper. The key parameters of this system was optimized by PENELOPE code. And the system is built and the volume of BIXS measurement chamber is 1.77 mL. The response of this system was evaluated by using hydrogen and argon mixed gas containing tritium. The results of repeated experiments show that the deviations of total counting rate of BIXS spectra and the characteristic X-ray of Ar and Au are less than 0.8%, 1.3%, 3.8%, respectively. In addition, the counting rate of BIXS spectra, characteristic peak of argon and bremsstrahlung linearly increase with pressure, however the intensity of characteristic peak of Au hardly changes with the tritium partial pressure in this atmosphere.