The recent IAEA environmental transfer parameter handbooks and contribution from Japan

In 1994, the IAEA published technical reports series No. 364 entitled "Handbook of Parameter Values for the Prediction of Radionuclide Transfer in Temperate Environments" (hereafter, TRS-364). Data in TRS-364 have been used in environmental radiation dose assessments in Japan. About ten years after TRS-364, IAEA started to revise the handbook and finally produced two TRS books Nos. 472 and 479; TRS-472 was published in 2010 to follow-up TRS-364 considering climate condition dependent parameter values and TRS-479 was published in 2014 to assess dose to wildlife and whole body is its target, while TRS-364 and 472 were for edible parts. These two handbooks are useful for estimating the migration and transfer of radionuclides in various types of environments. As contributors of these handbooks, we reported herewith some specific background conditions for these publications, especially focused on the data from Japan. In TRS-364, nine Japanese papers were used, but only several data were adopted in the handbook. In TRS-472 and TRS-479, more Japanese data sets, such as soil-to-rice transfer factors and soil-soil water distribution coefficients, were included successfully. It was probably because of the international scientists participated in the IAEA meetings for these TRS publications recognized that the data from our group and other Japanese were highly reliable. (author)