Accurate measurement of a fission chamber efficiency using the prompt fission neutron method Ludovic Mathieu, Mourad Aïche, Grégoire Kessedjian, Serge Czajkowski, Beatriz Jurado, Paola Marini and Igor Tsekhanovich EPJ Web Conf., 146 (2017) 03016 Published online: 13 September 2017 DOI: 10.1051/epjconf/201714603016