全国では概ね15軒中1軒のラドン濃度が高い
Reduce Lung Cancer Risk in 2013 by Testing Your Home for Radon Gas / Elevated radon levels found in roughly 1 in 15 homes nationwide
01/14/2013
http://yosemite.epa.gov/opa/admpress.nsf/bd4379a92ceceeac8525735900400c27/e0101775de4c6bf585257af3005bbc71!OpenDocument
1月はラドン対応月間
Radon
http://www.epa.gov/radon/