Neutron and gamma spectroscopy for clinical dosimetry

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Abstract
Neutron and photon energy spectra were measured in different depths and lateral positions in tissue-equivalent [human] phantoms exposed to a therapeutic 14.1 MeV neutron beam. Intensity weighted mass energy absorption coefficients were derived for application in ionization chamber dosimetry in mixed neutron-.gamma. fields. The relative depth doses show that on the beam axis for depths in excess of 20 cm, .gamma. radiation contributes more than 10% to the total dose; off the axis outside the direct beam neutron and .gamma. doses are comparable. The differences between these doses and those neglecting the spectra distribution increase with depth and distance from the beam axis.

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