COMPREHENSIVE STUDY ON LIFCU,MG,P (GR-200-A)

The main properties of a new thermoluminescent (TL) material (LiF:Cu,M g,P) produced in the People's Republic of China under the name of GR-2 00A have been already investigated by others. The purpose of this work is to establish a standarised procedure for use. Careful experiments were carried out with the aim of identifying the optimal annealing cyc le and the dependence of TL sensitivity on the heating rate. Furthermo re, reading procedure, fading, calibration and TL dependence on dose w ere studied along with other relevant physical features. The high sens itivity (20 to 30 times that of LiFTLD-100), the wide range of dose li nearity (0-18 Gy), the short annealing procedure (10 min at 513 K) tog ether with a negligible fading at room temperature, quick readout cycl e (35 s), good tissue-equivalence (Z(eff)=7-8) and TL signal reproduci bility (SD < 2.5%) make GR-200A TLDs particularly valuable for several dosimetry purposes. Their high sensitivity makes them especially elig ible for environmental and radiological dosimetry, while the wide dose linearity range allows various radiotherapeutic applications in patie nt and machinery output dosimetry.