TREATMENT METHOD FOR MATERIAL ACCOUNTANCY OF RADIOACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To accurately calculate tritium amount captured in whole surface area by casting ultraviolet laser, giving material surface abrasion and uniformly vaporizing or gasifying only within the irradiation area with photochemical effects. SOLUTION: Ultraviolet laser transmitted through a fiber 24 is focused with a lens 26 and casted on a specific area surface of a material 20. On the surface of the material 20 irradiated by the ultraviolet laser, abrasion is caused and the surface is ground according to the energy density and shot number. Tritium dissociated from the surface by the abrasion is extracted out through an exhaust pipe 28. By measuring the tritium amount in the exhaust air with a quadrupole mass analyzer 30 connected with the exhaust pipe 28, the tritium in the area of abrasion can be measured. By examining the measured tritium amount as a function of depth, the captured tritium amount as a function of the depth in the surface layer of the material 20 can be measured.