Monitoring of tritium in diluted gases by detecting bremsstrahlung X-rays

摘要

For developing an alternative mean for on-line and real-time tritium monitoring, the method of detecting bremsstrahlung X-rays was examined by measuring the counting rate of bremsstrahlung X-rays as a function of pressure in two mixed tritium gases diluted with hydrogen or helium. At a constant tritium partial-pressure ratio of 0.010, the relationship between the counting rate of bremsstrahlung X-rays, X (cpm) and the total pressure, P (Pa) can be expressed as X=4.1 x 10~5 (1 - e~(-4.0 p/100,000).. The counting rate depends only on tritium partial-pressure and the total pressure if the mixed gases contain no other species but hydrogen isotopes and helium isotopes. In addition, the relation between X and P can be simplified to a linear function in the low-pressure region of P K 2.5 x 10~4 Pa.