Danilczuk M, Gustafsson H, Sastry M D, Lund E, Lund A
Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Jan;69(1):18-21. doi: 10.1016/j.saa.2007.03.001. Epub 2007 Mar 6.
Polycrystalline ammonium dithionate has been examined for its radiation response in the low dose range (<5Gy) using EPR technique. The SO(3)(-) radical ion was detected as a single EPR line with a peak-to-peak derivative width of ca. 0.44mT in irradiated samples and its intensity was found to vary linearly with dose. At equal and moderate settings of microwave power and modulation amplitude ammonium dithionate was at least seven times more sensitive than l-alanine which is the most common EPR dosimeter standard. Pulse experiments were performed on the powder samples to obtain the longitudinal relaxation time. These and microwave saturation experiments served to indicate the optimal microwave power to be applied during measurements as an EPR dosimeter for best sensitivity of this material. It is thus claimed that ammonium dithionate has excellent potential to become an EPR dosimeter with a low limit of the measurable dose for cases where tissue equivalence is not required or can be corrected for.
利用电子顺磁共振（EPR）技术，已对多晶连二硫酸铵在低剂量范围（<5Gy）内的辐射响应进行了研究。在辐照样品中，SO(3)(-) 自由基离子被检测为一条单EPR线，其峰 - 峰值导数宽度约为0.44mT，并且发现其强度随剂量呈线性变化。在微波功率和调制幅度相同且适中的设置下，连二硫酸铵的灵敏度至少是最常用的EPR剂量计标准物质L - 丙氨酸的七倍。对粉末样品进行了脉冲实验以获得纵向弛豫时间。这些实验以及微波饱和实验有助于确定在测量过程中作为EPR剂量计应用的最佳微波功率，以实现该材料的最佳灵敏度。因此，可以声称，对于不需要组织等效性或可以进行校正的情况，连二硫酸铵具有成为具有低可测量剂量下限的EPR剂量计的巨大潜力。
