Annual limits on intake and concentration limits for radioactive isotopes of astatine

For 209At and 210At which are not considered in ICRP Publication 30, annual limits on intake and derived concentration limits were calculated with the methodology shown in ICRP Publication 30. Values of committed dose equivalent and weighted committed dose equivalent in target organs or tissues per intake of unit activity were calculated using Evaluated Nuclear Structure Data File (ENSDF) decay data with a computer code system DOSDAC for preparing dosimetric data, which has been developed in the Japan Atomic Energy Research Institute. Calculated values for concentration limits on air and exhaust air are from six to seven orders of magnitude larger than the values in the current regulations, and those on draining water are also larger by four orders. Defects of ENSDF decay data for the radionuclides were modified in the calculation by the DOSDAC system. The dosimetric data were also calculated for 207At and 211At which are considered in ICRP Publication 30. The computer code system and relevant parameter values used here were verified by comparing these results with the values in the Supplement of ICRP Publication 30. (author)