González P R, Mendoza-Anaya D, Ávila O, Escobar-Alarcón L
Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca S/N, La Marquesa, Ocoyoacac, Estado de México, C.P. 52750, Mexico.
Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca S/N, La Marquesa, Ocoyoacac, Estado de México, C.P. 52750, Mexico.
Appl Radiat Isot. 2023 Oct;200:110975. doi: 10.1016/j.apradiso.2023.110975. Epub 2023 Aug 9.
The luminescent and dosimetric properties of the MgBO phosphor co-doped with Tm and Dy ions (MgBO:Tm,Dy) obtained by the solution combustion technique were investigated. With the prepared material, sintered dosimeters in pellet form were made. The MgBO dosimeters doped with Tm and Dy with 0.25 and 0.10 mol% respectively and sintered at 1223 K for 3 h showed a sensitivity almost 11 times greater than the sensitivity of the TLD-100 commercial dosimeter. The TL response as a function of the gamma dose showed linearity up to 50 Gy followed by a supralinearity region and, above 500 Gy, the saturation region of the electron traps is reached. The fading of the main TL peak was negligible in the first five days after irradiation reaching 13% after 60 days and the lower detection limit was 43 μGy. The kinetic parameters were determined using the deconvolution method revealing general and second order kinetics. The morphology, crystallography and photoluminescence of the prepared phosphor samples are also reported.
研究了通过溶液燃烧技术获得的共掺杂Tm和Dy离子的MgBO磷光体（MgBO:Tm,Dy）的发光和剂量学特性。利用制备的材料制作了丸状烧结剂量计。分别掺杂0.25和0.10 mol%的Tm和Dy且在1223 K下烧结3小时的MgBO剂量计显示出的灵敏度几乎是TLD-100商业剂量计灵敏度的11倍。作为γ剂量函数的热释光响应在高达50 Gy时呈线性，随后是超线性区域，在500 Gy以上，达到电子陷阱的饱和区域。辐照后的前五天，主要热释光峰的衰减可忽略不计，60天后达到13%，检测下限为43 μGy。使用去卷积方法确定了动力学参数，揭示了一般动力学和二级动力学。还报道了制备的磷光体样品的形态、晶体学和光致发光情况。
