Benny P G, Bhatt B C
Isotope Division, Bhabha Atomic Research Centre, Trombay, India.
Appl Radiat Isot. 1996 Jan;47(1):115-21. doi: 10.1016/0969-8043(95)00239-1.
Thermoluminescence (TL) properties of sand, collected from sewage sludge, were studied after extensive cleaning procedures. In the sand samples treated with either hydrogen peroxide (H2O2) or hydrofluoric acid (HF), there was a prominent TL peak at about 220 degrees C after gamma-irradiation and 120 degrees C, 20 min post-irradiation annealing treatment. The dose vs TL response curves in hydrogen-peroxide-treated and HF-treated sand samples were found to be linear up to 30 and 100 Gy, respectively, beyond which they were supra-linear. The extent of post-irradiation fading in the sand sample, which was treated with H2O2 and post-irradiation annealed at 120 degrees C for 20 min, was observed to be 8% after 21 days, while no detectable fading was observed for the sample which was HF treated and annealed at 120 degrees C for 20 min after gamma-irradiation. Therefore, H2O2- as well as HF-treated sludge sand samples could be considered for use as in situ TL dosimeters for radiation disinfection of sewage sludge.
在经过广泛的清洗程序后，研究了从污水污泥中收集的沙子的热释光（TL）特性。在用过氧化氢（H2O2）或氢氟酸（HF）处理的沙子样品中，γ辐照后约220摄氏度处有一个明显的TL峰，辐照后退火处理20分钟后在120摄氏度处有一个明显的TL峰。发现过氧化氢处理和氢氟酸处理的沙子样品中的剂量与TL响应曲线分别在30和100 Gy之前呈线性，超过该剂量则呈超线性。观察到，用H2O2处理并在120摄氏度下辐照后退火20分钟的沙子样品，21天后辐照后褪色程度为8%，而γ辐照后用HF处理并在120摄氏度下退火20分钟的样品未观察到可检测到的褪色。因此，H2O2处理以及HF处理的污泥沙子样品可考虑用作污水污泥辐射消毒的原位TL剂量计。
