Measured Neutron Spectra and Dose Equivalents From a Mevion Single-Room, Passively Scattered Proton System Used for Craniospinal Irradiation. - Howell RM; Burgett EA; Isaacs D; Price Hedrick SG; Reilly MP; Rankine LJ; Grantham KK; Perkins S; Klein EE (International journal of radiation oncology, biology, physics, 2016)