* One month is equal to 1/12 part of a year.
** One year is equal to 365 days.
Reference data: T.V.Golashvili, V.P.Chechev, A.A.Lbov, V.M.Kupriyanov, A.P.Demidov "Nuclide Guide-2". Edited by V.N.Mikhajlov, 2-nd edition, revised, Moscow, ATOMINFORM, 2002.