Half life of Technetium is: (A) 6 hours, (B) 12 hours, (C) 24 hours, (D) 26 hours
Answer is A. A i.e. 6 hours Half life (tin) of radium (Ra226)is 1602-1626 years (longest)Q; Cesium (137Cs) is 30 yearsQ; Cobalt (60Co) is 5.2 yearsQ; iridium (1921r)is 74.5 daysQ; Iodine (P31)is 8 daysQ; 1123 is 13 hoursQ; technitium (Tc99) is 6 hoursQ; and 1132 is 2.3 hoursQ.