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Some irradiated saccharides emit light when dissolved in water. Glucose, xylose and mannose were selected as the most suitable materials for lyoluminescence dosimetry. Using 6oCo as a radiation 7-source, the performance of these materials has been evaluated from the point of view of sensitivity, stability against thermal annealing or exposure to light and their linear behaviour with doses up to 100 krads. Their lower limit, depending upon the apparatus used is about 100 rads. With trehalose 2 H 2 0 and luminol solution, doses between 1 and lo6 were measured.their esr spectra with their lyoluminescent behaviour. But the actual mechanism of light emission needs further It appears that trapped free radicals are responsible for the light emission. An attempt has been made to correlate investigation.

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The piezoluminescence emission spectra in γ‐irradiated ultra pure KBr and KCl single crystals are investigated. An isothermal blue shift is observed which increases with the increasing uniaxial pressure. The isobaric thermoluminescence spectra of the same crystals are also measured for comparison. A red shift is observed in this case which increases with the increasing temperature. The results are explained on the basis of the change in the lattice parameter and the band gap energy with pressure and temperature. Glow curve measurements are made to support the proposed explanation.

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