Depth dose measurements of d T neutrons for radiotherapy applications
article
In connection with clinical applications of fast neutrons, depth dose measurements have been carried out for collimated 15 MeV neutron beams at various source to skin distances, using different phantoms of the upper part of the human body. The distribution of fast, thermal and intermediate neutron dose or kerma and gamma dose over the phantoms was determined with tissue equivalent ionization chambers, gold foils with and without cadmium covers and a shielded Geiger Muller counter, respectively. In order to determine the tumour dose and the exit dose for the irradiation of patients with pulmonary metastases, depth dose measurements have been performed for an inhomogeneous phantom containing lung equivalent material. The measurements indicate a considerable difference in depth dose with respect to the dose distribution in a homogeneous phantom. Measurements with sulphur activation detectors to monitor the exit dose are discussed and compared with the results obtained in the actual patient irradiations.
Topics
TNO Identifier
227863
ISSN
00392073
Source
Strahlentherapie, 149(6), pp. 585-596.
Pages
585-596
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