Systematic radon monitoring in the Gran Sasso Underground Laboratory was performed in order to determine the background radon contribution to the sophisticated experimental apparatus and to check health physics standards for the personnel. As expected, the radon concentrations were found to depend strongly on the ventilation in the three experimental halls. Considerable reductions in the radon concentrations were obtained in 1993, when fresh air was drawn into the laboratory through a pipe and exhaust air was routed into the highway tunnel.
Thin ceramic pellets of BeO are now being used in many institutions as cheap, reliable, personnel monitoring dosemeters. Morphologically, in contrast to LiF TLDs, the BeO detectors have an opaque microporous, and hard ceramic constitution. It is evident that during the readout of BeO chips, exposed to gamma rays, where the TL emission centres are uniformly distributed throughout the bulk of the detector, a substantial amount of TL output is absorbed inside the chip. The present paper describes the experimental procedure for the determination of the self-absorption coefficient of TL light in the Be0 Thermalox 995 detectors. The results show that the self absorption effect should be considered when comparing the TL readouts measured with BeO detectors of different thickness.
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