A radio-photoluminescence dosimeter glassof low dependence on energy, consistingessentially of an inorganic silver compoundand at least one metal fluoride selected fromthe group consisting of an alkalimetal, alkaline earth metal, lanthanum, andaluminum.A radio-photoluminescence dosimeter glassof low dependence on energy, consistingessentially of an inorganic silver compoundand at least one inorganic complex metalfluoride.
The basic principle of RPLGD is that the color centers areformed when the luminescentmaterial inside the glasscompound exposed to radiation and fluorescence are emittedfrom the color centers after irradiated with ultra-violet light.The excited electrons generated from the color centers returnto the original color centers after emitting the fluorescence.This process is called radio-photoluminescence phenomena.Because the electrons in the color centers return to theelectron traps after emitting the fluorescence
Repeatable readoutThe luminescence signal does not disappear afterreadout; therefore, repeated readout for asingle exposure is possible.
Small difference in individual sensitivityThe readout variation between differentRLGDs with the same exposure is small.RPLGDis manufactured with melted glass;therefore, its individual sensitivity is smallas comparedto that of either TLD or OSLD.
Better reproducibilityBy using pulse ultra-violet laser as excitedsource, the accuracy of repeated readout canbemaintained. Therefore, RPLGD has a verygood reproducibility.
Wide measurable dose rangeThe dose linearity range for RPLGD is 0 –500 Gy. This range covers the dose rangeused inthe medical field. RPLGD can therefore beapplied for dose verification in radiotherapyaswell as in diagnostic radiology. RPLGD isalso desirable for high dose gradientarea, such asIMRT (Intensity Modulated Radiotherapy)procedures or HDR (High Dose Rate RemoteAfterloader) procedures because of its smalleffective readout area.
Feasibility of personal dose monitor toolsThe characteristics, physical andchemical, of RPLGD are equal to or betterthan that of TLDand OSLD because of its luminescencematerial and readout technique.Hence, RPLGD canbe used as dose monitor for radiation fieldworker.