Neutrons produced by bombarding beryllium with 16-, 30-, and 50-MeV deuterons are compared in terms of dose rate, skin sparing, depth dose, and field flatness. In general, the dosimetric properties improved as the energy increased, but at 50 MeV flattening filters were necessary. Isodose curves for treatment planning were generated, using the decrement-line method, and were compared to curves measured by a computer-controlled isodose plotter. This system was also employed to measure the isodose curves for wedge fields. Dosimetry checks on various patients were made, using silicon diodes as in vivo fast neutron dosimeters.
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Smith et al. (1974) studied this question.