NUCLEAR-DATA NEEDS FOR NEUTRON THERAPY AND RADIATION PROTECTION

New nuclear data are required for improved neutron and proton radiothe rapy treatment planning as well as future applications of high energy particle accelerators. Modern neutron radiotherapy employs energies ex tending to 70 MeV, while industrial applications such as transmutation and tritium breeding may generate neutrons exceeding energies of 100 MeV. Secondary neutrons produced by advanced proton therapy facilities can have energies as high as 250 MeV. Each use requires nuclear data for transport calculations and analysis of radiation effects (dosimetr y). The nuclear data needs supportive of these applications are discus sed, including the different information requirements. As data in this energy region are sparse and likely to remain so, advanced nuclear mo del calculations can provide some of the needed information. In this c ontext new evaluated nuclear data are presented for C, N, and O. Addit ional experimental information, including integral and differential da ta, are required to confirm these results and to bound further calcula tions. The required new data to be measured and the difficulties in ca rrying out such experiments are indicated.