[en] A combined detector intended for both experiments in search of anomalous nuclei and using as an integral differential monitor in the course of experiments with reactor antineutrinos is described. The combined detector consists of three independent detectors: neutron detector, liquid scintillation detector and semiconductor or gas scintillation detector, structurally united with each other. The neutron detector is made of wood and has dimensions of 800x800x1080 mm. Neutron detection is realized by 105 proportional counters each of which represents a steel cylinder filled with He³ and Ar mixture. To increase the neutron detector efficiency either a liquid scintillation detector or aluminium containers with 13 proportional counters are placed along the neutron detector axis. The neutron detector efficiency in experiments with ²⁵²Cf operating with a liquid scintillation detector constitutes 54 %, when operating with aluminium containers filled with D₂O - 64%. The liquid scintillation detector of 10 l volume is filled with a scintillator on the hexafluoro-benzene (C₆F₆) base. Its energy solution at the 1 MeV level constitutes 20%. In the centre of the liquid scintillation detector a gas scintillation detector filled with Ar and N mixture at 500 kPa pressure is located. The efficiency of such detector to ²⁵²Cf fission is not less than 99.5 %. The results of the combined detector preliminary experiments are presented