Combined backscatter and transmission method for nuclear density gauge Seyed Mohammad Golgoun, Dariush Sardari, Mahdi Sadeghi, Mohammad Ebrahimi, Mojtaba Aminipour and Mohammad Reza Davarpanah EPJ Web of Conferences, 100 (2015) 02004 Published online: 09 July 2015 DOI: 10.1051/epjconf/201510002004