STUDIES ON NI-63 BASED CHECK-LIGHT SOURCES FOR TL READERS

The performance of indigenously produced, electrodeposited Ni-63 sourc es having 10 mm x 10 mm active area and individually coupled to a plas tic scintillator has been studied. TL phosphors such as CaF2, CaF2:Dy, CaF2:Tm, CaF2:Eu, TLD-100 and CaSO4:Dy with Ni-63 have been studied f or their possible use as check-light sources for testing TL readers. S tability at ambient temperatures (298-323 K), build-up and decrease of light output with time have been examined. A preliminary study of the fluorescent species in the gamma irradiated plastic scintillator has been made.