Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan.
Health Phys. 2013 Aug;105(2):150-5. doi: 10.1097/HP.0b013e31828cf924.
Topaz is a natural hard silicate mineral that has the potential to be used as a thermoluminescent dosimeter (TLD). It is difficult to manufacture chips of topaz and problematic to use its powder as TLDs. Topaz-glass composite (in the form of pellets) can be made easily and applied for radiation dosimetry. To produce pellets of topaz-glass composite in 2:1 wt (%), topaz powder was combined with commercial glass. The pellets with 6 mm diameter and 1 mm thickness were sintered in a furnace at 900°C for 1 h. The composite pellets were irradiated with x-ray and gamma photons and alpha and beta particles. The pellets yielded two peaks in the glow curve; Peak 1 at temperature range 150-160°C and Peak 2 at 250-260°C. The intensity of Peak 2 rose linearly with the increase in absorbed dose. The intensity of Peak 2 was comparable with peaks for photons and beta irradiation but relatively low for alpha exposure. The reproducibility of the intensity of Peak 2 was within 5-8%. Two months after irradiation of the pellets, the fading of the intensity of Peak 2 was found to be about 7%. The topaz-glass composite can be used effectively and efficiently for dosimetry of alpha, beta, and gamma radiation.
黄玉是一种天然硬质硅酸盐矿物，有潜力被用作热释光剂量计（TLD）。制造黄玉芯片很困难，将其粉末用作 TLD 也存在问题。黄玉-玻璃复合材料（以颗粒形式）易于制造，可用于辐射剂量测定。为了在 2:1wt（%）的比例下生产黄玉-玻璃复合材料的颗粒，将黄玉粉末与商业玻璃结合。将直径为 6 毫米、厚度为 1 毫米的颗粒在 900°C 的炉中烧结 1 小时。用 X 射线和伽马光子以及阿尔法和贝塔粒子对复合颗粒进行辐照。在热释光曲线中，颗粒产生了两个峰；在 150-160°C 温度范围内的峰 1 和在 250-260°C 的峰 2。峰 2 的强度随吸收剂量的增加呈线性上升。峰 2 的强度与光子和贝塔辐照的峰值相当，但与阿尔法辐照的峰值相比相对较低。峰 2 强度的重现性在 5-8%以内。辐照颗粒两个月后，发现峰 2 的强度衰减约为 7%。黄玉-玻璃复合材料可有效、高效地用于阿尔法、贝塔和伽马辐射的剂量测定。
