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In the paper, the physical model of a doped scintilator is described. The Monte Carlo type code NEU-7 [Cvachovec, Cvachovec, and Tajovsky, Nucl. Math. Inst. Phys. Res. A, Vol. 476, 2002, pp. 200–202], which was created for a NE-213 and stilben type scintillators containing also hydrogen and carbon only, was extended for scintillators containing 10B, 11B, and O also. The modified NEU-7 code is called NEUB-7, and with it the response function for scintilator BC-523A doped with 4.41 % 10B was calculated. The dimensions of the cylindrical scintilator are 5 × 6 in.2, corresponding to the real detector. The created response matrix was implemented in the unfolding code with the maximum likelihood method.

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Abstract-This paper shows the results of digital processing of output pulses from combined photon-neutron detector using a commercially available digitizer ACQUIRIS DP 210. The advantage of digital processing is reduction of the apparatus in weight and size, acceleration of measurement, and increased resistance to pile-up of pulses. The neutron and photon spectrum of radionuclide source 252 Cf is presented.