is designed to measure the thermal neutron flux caused by fast neutron moderation in the rock to provide the formation total waterlogged porosity and lithology within different kind of wells.
Features and advantages • downhole tool small diameter; TzSP-2NNK-43/60 is to be run with the log recorder Volcan V3 with one-core and tree-core cable. Waterlogged porosity range, % 1÷40 Relative measurement error, % 5 Probe length (small/large), mm 300/600 Probe length variability (build-up number/length), mm 3/100 Neutron generator type IBN-8-5 Neutron source emission rate, n/sec 2×107 Maximal operating temperature, °C 120 Maximal operating pressure, MPa 100/60 Downhole tool dimensions, mm: diameter length 43/60 1600 Weight, kg, up to 12/18 
• pulse miscount elimination thanks to recording channel “dead time” correction for analog signal transmission with bipolar pulses 10÷20 microsec due to statistic adjustment;
• high-efficiency neutron counter with helium filling agent.