Neutron Survey Meter - Radiation Detectors.

Neutron survey meters measure ambient neutron radiation dose rate and fluence in real time. Radiation protection officers, nuclear facility workers, and CBRN teams use these instruments to assess neutron exposure levels during facility inspections, source handling operations, and emergency response scenarios. Unlike gamma survey meters, these instruments detect the electrically neutral neutron particle specifically — providing separate neutron dose data alongside gamma measurements in mixed radiation fields.

Neutrons do not ionize matter directly. Survey meters therefore use nuclear conversion reactions to generate detectable secondary charged particles. He-3 proportional counter tubes achieve thermal neutron detection efficiencies above 70% through the n + He-3 → p + T reaction. Polyethylene moderator enclosures surround the detector tube. They slow fast neutrons to thermal energies before detection. This produces a dose response that remains relatively flat across the thermal to fast neutron energy range. Furthermore, Li-6 scintillator and boron-lined proportional counter detectors provide He-3 alternatives. These suit border portal monitors and field search instruments where He-3 supply constraints apply.

Dose rate display ranges cover 0.1 µSv/h to 10 Sv/h on professional rem meters. Energy-compensated detector assemblies display dose equivalent directly in µSv/h or mSv/h without manual calculation. Instruments such as the Ludlum 42-40 and Thermo Fisher REM-500 use tissue-equivalent moderator geometries. They meet IAEA and ANSI N13.5 requirements for personnel neutron dose monitoring. Additionally, audible count rate outputs increase in frequency as dose rate rises — alerting operators to increasing neutron fields without requiring visual display attention during active survey work.

Data logging on professional models stores dose rate readings and accumulated dose values with timestamps. Moreover, Bluetooth and USB connectivity transfer stored data to PC-based radiation monitoring software for regulatory compliance reporting and incident reconstruction documentation.

These meters serve Pakistan’s PAEC nuclear facility radiation protection programs, Pakistan Army CBRN reconnaissance units, Pakistan Customs radiation monitoring teams at Karachi Port and Torkham border crossing, and university nuclear physics research departments in Lahore and Islamabad requiring dedicated neutron dose rate measurement alongside gamma radiation survey instruments.

Tactical Supply Pakistan supplies neutron survey meters for nuclear facility radiation protection, CBRN reconnaissance, and border security neutron screening procurement across Pakistan.