Natural radioactivity and radon emanation coefficient in the soil of Ninh Son region, Vietnam Thu, Huynh Nguyen Phong ; Thang, Nguyen Van ; Loan, Truong Thi Hong ; Dong, Nguyen Van ; Hao, Le Cong Abstract Publication: Applied Geochemistry Pub Date: May 2019 DOI: 10.1016/j.apgeochem.2019.03.019 Bibcode: 2019ApGC..104..176T