Department of Radiological Life Sciences, Graduate School of Health Sciences, Hirosaki University , Hirosaki , Japan.
Free Radic Res. 2014 Jun;48(6):679-83. doi: 10.3109/10715762.2014.900174. Epub 2014 Apr 1.
We investigated effects of low-dose X-ray irradiation on eggshells radical production. Eggshells irradiated by low-dose X-ray produced stable radicals. The stable radicals at the central region of the spectrum are the carbonates and CO2(•-) signals. The electron spin resonance (ESR) signals increase with increasing absorbed dose. The estimated radical concentration (spin number) was approximately 3.6 × 10(12) (spins/g) at 10-Gy dose using various known concentrations of TEMPOL (4-hydroxy-2, 2, 6, 6-tretramethylpiperidin-1-oxyl) aqueous solutions. The stable radicals in irradiated eggshells were recognized at the low-level dose (0.10 Gy). In addition, no significant dose rate (0.5-1.5 Gy/min) dependence was found for the radical production.
我们研究了低剂量 X 射线照射对蛋壳自由基生成的影响。低剂量 X 射线照射后的蛋壳产生了稳定的自由基。光谱中心区域的稳定自由基是碳酸盐和 CO2(•-)信号。电子自旋共振（ESR）信号随吸收剂量的增加而增加。使用不同浓度的 TEMPOL（4-羟基-2,2,6,6-四甲基哌啶-1-氧自由基）水溶液，在 10Gy 剂量下，估算的自由基浓度（自旋数）约为 3.6×10(12)（自旋/g）。在低剂量（0.10Gy）下即可检测到辐照蛋壳中的稳定自由基。此外，自由基的产生与剂量率（0.5-1.5Gy/min）没有明显的相关性。
