  R-134a (C2H2F4) is a low cost, easily available and chlorine free
refrigerant, which in its superheated state can be used as an efficient neutron
detector. Due to its high solubility in water the R-134a based superheated
droplet detectors (SDD) are usually very unstable unless the detector is
fabricated using a suitable additive, which stabilizes the detector. The SDD is
known to have superheated droplets distributed in a short-lived and in a
relatively longer-lived metastable states. We have studied the detector
response to neutrons using a 241AmBe neutron source and obtained the
temperature variation of the nucleation parameters and the interstate kinetics
of these droplets using a two-state model.
