1. 1) NCRP Report No.109 (1991)
2. 2) IAEA, Technical Report Series 332, IAEA, Vienna (1992)
3. 3) UNSCEAR, Report to the General Assembly, (1996)
4. 4) OECD, “DECD Guidelines for Testing of Chemicals”, Nos.201-210 (1993)
5. 8) Sugiura, K.: Environ. Toxicol. Chem., 11, 1217-1226 (1992)