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首页> 外文期刊>Radiation Protection Dosimetry >DETERMINATION OF THE AVERAGE NATIVE BACKGROUND AND THE LIGHT-INDUCED EPR SIGNALS AND THEIR VARIATION IN THE TEETH ENAMEL BASED ON LARGE-SCALE SURVEY OF THE POPULATION
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DETERMINATION OF THE AVERAGE NATIVE BACKGROUND AND THE LIGHT-INDUCED EPR SIGNALS AND THEIR VARIATION IN THE TEETH ENAMEL BASED ON LARGE-SCALE SURVEY OF THE POPULATION

机译：基于人口大调查的平均牙本质背景和光诱发的EPR信号及其在牙齿珐琅质中的变化

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The aim of the study is to determine the average intensity and variation of the native background signal amplitude (NSA) and of the solar light-induced signal amplitude (LSA) in electron paramagnetic resonance (EPR) spectra of tooth enamel for different kinds of teeth and different groups of people. These values are necessary for determination of the intensity of the radiation-induced signal amplitude (RSA) by subtraction of the expected NSA and LSA from the total signal amplitude measured in L-band for in vivo EPR dosimetry. Variation of these signals should be taken into account when estimating the uncertainty of the estimated RSA. A new analysis of several hundred EPR spectra that were measured earlier at X-band in a large-scale examination of the population of the Central Russia was performed. Based on this analysis, the average values and the variation (standard deviation, SD) of the amplitude of the NSA for the teeth from different positions, as well as LSA in outer enamel of the front teeth for different population groups, were determined. To convert data acquired at X-band to values corresponding to the conditions of measurement at L-band, the experimental dependencies of the intensities of the RSA, LSA and NSA on the m.w. power, measured at both X and L-band, were analysed. For the two central upper incisors, which are mainly used in in vivo dosimetry, the mean LSA annual rate induced only in the outer side enamel and its variation were obtained as 10 ± 2 (SD = 8) mGyy~(-1), the same for X- and L-bands (results are presented as the mean ± error of mean). Mean NSA in enamel and its variation for the upper incisors was calculated at 2.0 ± 0.2 (SD = 0.5) Gy, relative to the calibrated RSA dose-response to gamma radiation measured under non-power saturation conditions at X-band. Assuming the same value for L-band under non-power saturating conditions, then for in vivo measurements at L-band at 25 mW (power saturation conditions), a mean NSA and its variation correspond to 4.0 ± 0.4 (SD = 1.0) Gy.
机译：该研究的目的是确定牙釉质在不同种类的牙齿上的自然本底信号幅度（NSA）和太阳光感应信号幅度（LSA）的平均强度和变化。和不同的人群。对于体内EPR剂量测定法，通过从L波段中测得的总信号幅度减去预期的NSA和LSA，可以确定这些值对于确定辐射诱导信号幅度（RSA）的强度。在估计估计的RSA的不确定性时，应考虑这些信号的变化。对早期在X波段在俄罗斯中部人口的大规模检查中测量的几百个EPR光谱进行了新分析。基于此分析，确定了不同人群牙齿的NSA振幅的平均值和振幅（标准差，SD），以及前牙外釉质中的LSA的平均值。为了将在X波段获得的数据转换为与L波段的测量条件相对应的值，RSA，LSA和NSA的强度的实验相关性取决于m.w。分析了在X波段和L波段测得的功率。对于主要用于体内剂量测定的两个中央上切牙，仅在外侧牙釉质中诱导的平均LSA年率及其变化为10±2（SD = 8）mGyy〜（-1），对于X波段和L波段也是如此（结果表示为平均值±平均值误差）。相对于在X波段在非功率饱和条件下测得的RSA校准后对伽玛射线的剂量响应，平均牙釉质的NSA及其上切牙的变化为2.0±0.2（SD = 0.5）Gy。假设在非功率饱和条件下L波段的值相同，然后在25 mW（功率饱和条件）下在L波段进行体内测量时，平均NSA及其变化对应于4.0±0.4（SD = 1.0）Gy 。

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