Threshold temperature for gamma-ray detection in superheated drop detector

The gamma -ray detection threshold temperatures of superheated drops of ref rigerant liquid R-12 is presented here for the three gamma -ray energies 59 .54 keV (Am-241, 500 mCi), 662 keV (Cs-137, 32.5 mCi) and 1250 keV (Co-60, 0.45mCi). Nucleation was detected with an active device by counting the num ber of drops vaporized per minute as a function of the temperature of the d etector over a wide range. The results show that the threshold temperature for detection increases with the energy of the incident photons. (C) 2001 E lsevier Science Ltd. All rights reserved.