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A detector system based on partially depleted silicon surface barrier detectors and fast front‐end electronics has been built and cross calibrated to a set of absolutely calibrated 4He recoil detectors. The cross‐calibration factor for the channel with the widest dynamic range is 2.5×10−13 counts per 14 MeV source neutron. These data agree well with the independent neutron activation data. The new detector system covers a large dynamic range (corresponding to 1013–1018 neutrons/s). The response is linear, except at the highest count rates where the detector dead time (∼200 ns) causes departure from linearity. The noise discrimination against 2.5 MeV neutrons and γ pileup is excellent. Measurements of D‐T neutrons from a tritium gas puff experiment as well as from a high‐power D‐T discharge in the TFTR tokamak are presented.

Measurement of 14 MeV neutrons at TFTR with Si-diode detectors