Mercury mass results
The NAA Hg mass measurement method for lamps is demon strated for an H-type lamp (fig. 4) irradiated in the DONA5 channel . table 1 lists the activities of most important radio nuclides, where T½ is the half –life in days, A0 A 20 and A 40 are activities at the end of irradiation , and after 20 days and 40 days of decay , respectively . The activity measurement , from which A0 A20 and A 40 were calculated, was carried out 7 day after the end of irradiation . in the last column, σ is thhe statistical counting error for 8 h of acquisition time.