title: Dosimetry measurements of 26, 35 and 45 MeV p-Be and p-Li neutron beams.
abstract: Dosimetric properties of neutron beams produced by stopping 26, 35 and 45 MeV protons in beryllium and lithium have been measured. The effects of filtering the p-Be beam with 6 cm of polyethylene have been investigated. The tissue kerma rate in air exhibited an energy dependence of approximately E3 and the rate for p-Be beams was approximately one-fifth of the rate for d-Be beams. The penetrability of the neutrons was significnatly enhanced by the use of the filter, but with a 50% attentuation in tissue kerma rate. The tissue kerma rate for the p-Li beam was nearly the same as that for the p-Be beam.
mesh_terms: D001608:Beryllium; D008094:Lithium; D009502:Neutrons; D011522:Protons; D011834:Radiation Monitoring; D011882:Radiotherapy, High-Energy; D013679:Technology, Radiologic
chemical_list: D011522:Protons; D008094:Lithium; D001608:Beryllium