Associate Professor of Medical Physics, Babol University of Medical Sciences, Babol-Iran.
Dose Response. 2010 Jan 15;8(3):368-77. doi: 10.2203/dose-response.09-011.Monfared.
The effect of natural background radiation on Cancer is still challenging. The investigation of association between external gamma rays and Cancer was the main goal of study. MATERIALS #ENTITYSTARTX00026;
External Gamma rays were measured using a radiation survey meter in 184 urban and rural health centers to estimate the exposure to the population in residential areas of Babol. The dose distribution map was compared to the 5 years radiation induced cancer incidence data from cancer registry center in north part of Iran.
Results showed that although the external gamma ray level in Babol is nearly equal to the average natural background radiation in the world, there is a relatively weak inverse association between local external gamma ray and incidence of Cancer [Correlation coefficient = -0.43, (p<0.01)].
This finding might be due to the inhibition of cancer induction following exposure to the low doses of ionizing radiation and probably can be a confirmation of radiation hormesis. However, due to some uncertainties, the conclusion should be interpreted with caution. Further national and international studies are suggested.
自然本底辐射对癌症的影响仍具有挑战性。本研究旨在调查外照射γ射线与癌症之间的关系。
使用辐射测量仪在 184 个城乡卫生中心测量外照射γ射线，以估算居民在巴博尔居住区的辐射暴露情况。将剂量分布图与伊朗北部癌症登记中心的 5 年辐射致癌发病率数据进行比较。
结果表明，尽管巴博尔的外照射γ射线水平接近世界平均天然本底辐射水平，但当地外照射γ射线与癌症发病率之间存在较弱的负相关关系[相关系数=-0.43，（p<0.01)]。
这一发现可能是由于低剂量电离辐射暴露后对癌症诱导的抑制作用，可能是辐射兴奋效应的证实。然而，由于存在一些不确定性，应谨慎解释这一结论。建议开展进一步的国家和国际研究。
