The preparation and characteristics of LiF:Mg,Cu,P TL material are described and recent improvements are also dealt with. The reproducibility, glow curve structure and other properties of LiF:Mg,Cu,P are dependent not only on the dopant concentration and crystallisation procedure but also on the thermal treatment programme, i.e. the temperature and the time of annealing. Usually the sensitivity (light integration) of LiF:Mg,Cu,P is influenced by the high temperature peak (250 oC). The combined annealing method (270 oC/240 oC double temperatures) can significantly reduce the higher temperature peak and therefore the TL repeatability is improved. Once the optimised preparation procedure and thermal treatment are chosen, the TL sensitivity is stable with re-use. The experimental results show that LiF:Mg,Cu,P has a promising potential in routine applications, (e.g. personal and environmental monitoring for gamma radiation) especially for ultra-low dose monitoring.

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Radiometric methods have been used in exploration for oil and gas by the Institute of Geophysical and Geochemical Exploration (IGGE) since 1984. More than 20,000 km2 of regional survey and 2,000 km2of detailed survey on the surface have been covered successively by this method. As a result, the distribution pattern of abnormal radiometric fields over oil and gas fields is confirmed by cavity gamma thermoluminescence dosimetry, which is an ideal radiometric accumulation measurement technique in searching for oil and gas. GR-200 LiF(Mg,Cu,P) dosemeters made in China are suitable detection elements. A thermoluminescence anomaly delineated survey over an oil field in comparison with drilling results, shows the advantages of this method in that 91% of dry holes or wells with water are outside the anomaly, and 61% of oil wells are inside the anomaly.