A chain of “International Conferences on High Levels of Natural Radiation and Radon Areas” has been held in the past in Brazil (1977), India (1981), Iran (1990), China (1996), Germany (2000), Japan (2004), India (2010), and Czech Republic (2014). These conferences have been on high levels of natural radiation and radon areas with themes to estimate risks of radiation-induced health-effects on public living in such areas. The International Committee on High Levels of Natural Radiation and Radon Areas (ICHLNRRA) has been highly instrumental to facilitate, regularize and organize such periodic chain of conferences in cooperation with different countries for enhancing new radiological, radiobiological, and epidemiological data in order to better disseminate state-of-the-art information and to harmonize future studies for obtaining consistent and reliable radiation-induced health risk data needed in radiation protection.

At the 8th IC-HLNRRAs in Prague, Czech Republic (1-5 September 2014), it was decided to expand the scope of this chain of conferences for gaining broader information on the areas with environments contaminated due to natural and/or man-made radionuclides and installations forming exiting, planned and emergency exposure situations with emphasis on human health effects, epidemiology, and social impacts. In this context, the scope of such conferences was expanded to “International Conference on High Level Environmental Radiation Areas (IC-HLERA). Accordingly, the 9th IC-HLERAs was the first conference of this kind successfully held at the Hirosaki University, Japan from 24 to 27 September 2018, for Understanding Chronic Low-Dose-Rate Radiation Exposure Health Effects and Social Impacts (http://hirosakiconf.sakura.ne.jp/). The conference through the International Committee on High Level Environmental Radiation Areas (ICHLERA) Panel among other things also concluded that from the countries expressed interest to host the 10th IC-HLERAs, the University of Strasbourg, France to host the 10th IC-HLERAs from 6 to 9 July 2020.