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Report No.
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Release behavior of $$^{203}$$Hg in J-PARC Materials & Life Science Experimental Facility

Sato, Koichi ; Masuyama, Koichi; Tajima, Takahiro; Yoshino, Koji; Seki, Kazunari; Kasugai, Yoshimi ; Miyamoto, Yukihiro 

Various kinds of experiments on material and biological science have been carried out using neutrons and muons generated by bombarding the mercury and muon target with high-energy (3 GeV) and high-intense (1MW) protons in the Materials and Life Science Experimental Faculty (MLF) of Japan Proton Accelerator Complex (J-PAPC). It was found that radioactive nuclide of $$^{203}$$Hg induced in the mercury target during the beam operation was released to the environment via the ventilation system from the stack at specific times during maintenance periods. The weekly-average concentrations of $$^{203}$$Hg in the stack were 2.4 $$times$$10$$^{-10}$$$$sim$$1.5 $$times$$10$$^{-9}$$ Bq/cm$$^{3}$$, which was much less than the legal limit by a factor of 1/10,000. The release behavior of $$^{203}$$Hg will be reported in the presentation.

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