The 304^th Session of Xiangshan Science Conference was held in Beijing from June 19^th to 21^st, themed as “Hazard Control of Radon and its Daughters”.

Academician of Chinese Academy of Engineering PAN Ziqiang delivered a report on the current research achievements and existing problems and the delegates had in-depth discussion on various sub-topics, such as radiation exposure by radon and its daughters, indoor and outdoor density of radon and thorium, geological source of radon and its control, etc.