[en] Superheated emulsion detector consists of droplets of two metastable states, one with a much shorter life-time (second metastable state) than the other (normal metastable state). The SED made from R-12 (CCl₂F₂) is sensitive to gamma rays near 40 ^oC. Gamma detection sensitivity of superheated R-12 increases monotonically beyond this threshold temperature. The radiation induced nucleation frequency of normal superheated drops of R-12 is studied in the temperature range 45-58 ^oC for gamma rays of energy 59.54 and 662 keV obtained from ²⁴¹Am and ¹³⁷Cs sources, respectively. It is observed that the radiation induced nucleation frequency and hence the gamma detection efficiency increase with temperature and with the energy of the gamma rays.