<prompt> MC used in Brachytheraphy of Carcinoma cervix:Radium-226Cobalt-60Gold-198Caesiom-137  <response>: Brachytherapy: Type of radiation in which radioactivesources are placed in dose proximity to or directly into tumors.Interstial RT Needles Placed into Prostatepenisothersoft tissue.Intracavitaryeg. In urethra mc used csl37 MC used source in Brachytherapy - Irl 90. C.S.I. REMEMBER, somecommonly asked half life of ISOTOPESRadium 2261620 yearsCaesium- 13730 yearsCobalt 60 --- 5.3 yearsIridium 19274.4yearsIodine 125 --- 60 daysPhosphorus3214.3 daysGold 1982.7 days 