1. (1) The Materials No. 1-1, The 66th meeting of Nuclear Safety Commission (NSC), Nov. 4, 1999.
2. (2) K. Komura (private communication).
3. (3) R. B. Firestones and V. S. Shirley, Table of Isotopes (8th Edition, John Wiley & Sons INC., 1996).
4. (4) E. A. C. Crouch, Atom. Data Nucl. Data Tables 19, 417 (1977).