The Possibility to Use Natural Material as a Measure of Ionizing Radiation

The suitability of gabbro for the gamma radiation dosimetry using thermo- luminescence (TL) technique has been investigated. Its properties are systematically investigated utilizing measurements of natural and laboratory induced blue TL emission band, annealing effects, and storage effects. The emission of the natural blue band exhibited broad peak at ~ 342oC. The TL- dose response has a linear behavior over the dose range 0.1Gy-10Gy followed by a supralinear one at high dose level 100Gy-700Gy.The fading in TL signal over two weeks of storage period at room temperature was not more than 41%. From our obtained results it is possible to conclude that the natural gabbro is a suitable material for accident and environmental dosimetric applications.. Keywords: Thermoluminescence; Gabbro; Gamma; Fading

Thermoluminescence Sensitization of Phyllite Natural Rock

A sensitization procedure is used to enhance the thermoluminescence (TL) sensitivity of phyllite to emit radiation. Phyllite is a type of foliated metamorphic rock made from slate. This study examines naturally grown phyllite rock, which had not been previously studied. Using a Thermo 3500 manual reader, the TL sensitivity of phyllite as a function of dosage was measured. The doses required to perform this study were administered using a 60Co source. The statistical regression test of the data had a significance level of p < 0.05. The study also included thermal and pre-dose effects. Using the sensitization procedure, the nonlinearity in TL dose–response was removed, and the sensitivity was increased 44 times that of its original value. The fading study showed a dependence on the test dose. According to the obtained results, the combination of linear dose–response and high sensitivity to gamma radiation makes phyllite an important rock for dating and retrospective dosimetry