Study and Search for Main Reason of Lung Cancers Based on Cherenkov Radiation in Environmental Radiation

Graduate of School of Science, Chiba University, Chiba, 268-8522, Japan

e-mails: hiroshi@hepburn.s.chiba-u.ac.jp

Published online: 10 January 2018

Abstract

The number of lung-cancer-related death is highest among all cancers in the world, and it is increasing in Japan where population aging in progressing. The main reason for the lung cancer of non-smokers is regarded to be environmental pollution or exposure of the lung to radon in the nature. The risk of lung cancer was estimated to increase by 8 to 13% per every 100 Bq m^-3 concentration of radon in the air. We observed beta rays with maximum energy of 3.27 MeV emitted from ²¹⁴Bi as one of the progenies based on a detection of Cherenkov radiation. The surface radioactivity concentration of ²¹⁴Bi on the sample was measured; the relation between the concentration and exposure time for the sample at the room air is researched. The behavior of the radon progenies in the air is discussed by a research for the progenies attaching on the sample after the radon decay. The inhalation of the radon progenies is not clear. Thus, to understand the behavior of progenies in the air make to clear the causal relation between the radon concentration and lung cancers.