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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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Lyoluminescent properties of mannose, glucose monohydrate, sucrose and trehalose dihydrate were investigated from the point of view of suitability as dosimetric materials in a new system of solid state dosimetry. Distilled water was used as a solvent. With a reader equipped with an uncooled PM tube it was possible to measure doses of X- and gamma-rays in the range from a few rad to about 100 krad. Various experimental factors which could affect the dose measurements using lyoluminescence are discussed, including the energy response for X-rays. Some preliminary information on the response of saccharides to fast neutrons is also included.