STUDY OF THE STABILITY OF EPR SIGNALS AFTER IRRADIATION OF FINGERNAIL SAMPLES
STUDY OF THE STABILITY OF EPR SIGNALS AFTER IRRADIATION OF FINGERNAIL SAMPLES
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DOI：
10.1097/hp.0b013e31824ac338
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发表时间：
2012-08-01
期刊：
影响因子：
2.2
通讯作者：
Romanyukha, Alexander
中科院分区：
文献类型：
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作者：
Reyes, Ricardo A.;Trompier, Francois;Romanyukha, Alexander
以往的研究表明，指甲中的电子顺磁共振可用于辐射剂量测定的目的。使用指甲作为应急剂量计的好处是容易，非侵入性采样和快速剂量测量（类似于10分钟）可能在现场条件下，几乎立即曝光事件后。这项研究代表了EPR指甲剂量学发展的下一步;例如，在一个实施例中，在不同储存和辐照条件下，评价辐射诱导信号（RIS）的稳定性。在两种温度条件下研究了应力（未处理）和非应力（浸泡在水中）样品（n = 20）在储存期间的RIS褪色：冷冻（温度约为-20 ℃）和室温（20-24 ℃）。用同样大小和数量的指甲标本，经15和20戈伊照射200 d以上，进行了测量。100和200戈伊照射114 d。另一组样品接受1、3、8和20戈伊辐照，储存时间为25个月。该研究表明，所有保存在低冷冻温度下的样品均显示出稳定的RIS，没有明显的褪色。所有保持在室温下的样品显示出信号的初始衰减，其中EPR信号在照射后随时间缓慢上升至饱和水平。获得的结果允许提出建议的适当储存条件的指甲EPR剂量测定使用。健康物理学103（2）：175-180;2012
Previous studies have suggested that the electron paramagnetic resonance in fingernails can be used for radiation dosimetry purposes. Use of fingernails as an emergency dosimeter has benefits of easy, noninvasive sampling and fast dose measurements (similar to 10 min) potentially in field conditions and almost immediately after an exposure event. This study represents the next step in the development of EPR fingernail dosimetry; e. g., evaluation of the stability of the radiation-induced signal (RIS) at different storage and irradiation conditions. RIS fading during storage in both stressed (untreated) and unstressed (soaked in water) samples (n = 20) was studied at two temperature conditions: freezing (temp approximate to -20 degrees C) and room temperature (20-24 degrees C). Fingernail samples with the same clipping size and number and irradiated to 15 and 20 Gy were measured for over 200 d. Those irradiated to 100 and 200 Gy were measured for 114 d. The other group of samples irradiated to 1, 3, 8, and 20 Gy was followed for 25 mo of storage time. This study demonstrated that all samples that were kept at low freezing temperatures showed a stable RIS with no significant fading. All samples that were kept at room temperatures showed an initial fading of the signal with a slow rise of the EPR signal after irradiation with time to a saturation level. Obtained results allow making recommendations on the appropriate storage conditions of fingernails for EPR dosimetry use. Health Phys. 103(2):175-180;2012