Neutron track length estimator for GATE Monte Carlo dose calculation in radiotherapy.The out-of-field dose in radiation therapy is a growing concern in regards to the late side-effects and secondary cancer induction.  The neutron track length estimator, a neutron variance reduction technique inspired by the track length estimator method has thus been developped for the first time in the Monte Carlo code GATE to allow a fast computation of the neutron dose in radiotherapy. 
GATE