Neutron survey meter

< return to the range

Portable Neutron Survey Meter NSN3

Portable Neutron Survey Meter NSN3The protection of workers exposed to radiation requires the control and monitoring of the level of contamination of sites before and during your interventions.

  • Reduce the duration of your on-site interventions thanks to easy deployment and handling
  • Optimise your measurement campaigns
  • Choose reliability with high precision measurements and data collection
  • Facilitate the recovery of collected data   


What is a portable neutron survey meterWhat is a portable neutron survey meter?

In accordance with the ICRP* recommendations, the survey meter is used for the detection of contamination and the evaluation of the ambient dose equivalent H*(10) before field work, before handling an object and when searching for hot spots. It allows rapid and immediate measurements of neutron radiation.

It is a complementary support to dosimetry for the protection and safety of workers.
*ICRP (International Commission on Radiation Protection)

How does the neutron survey meter NSN3 work?

FUJI Electric's major innovation is the use of an organic gas mixture of methane and nitrogen instead of 3He or BF3.
Fast neutrons are detected by the elastic diffusion reaction of hydrogen from methane. Thermal, slow neutrons are detected using the 14N (n,p) 14C reaction of nitrogen. The proton energy in this reaction is 626 keV.
By these two reactions, the measurement of the ambient dose equivalent of neutrons can be obtained from 0.025 eV up to 15 MeV.
This unique and patented technology, the result of Fuji Electric's R&D, allows high sensitivity to be achieved with a minimum of moderator in an ultra-light and handy device.


The Portable Neutron Survey meter NSN3 is designed for professionals exposed to radiation

NSN3 is designed for professionals exposed to radiationReduce the time spent on site with easy deployment and handling

The NSN3's portability and low weight of only 3kg make it easy to monitor.
Designed for adaptability in the field, the NSN3 operates on rechargeable or non-rechargeable batteries. It offers a long battery life of more than 12 hours of continuous display and more than 31 hours of non-displayed time.
It can also be used continuously via a mains supply.

Optimise your measurement campaigns

The device can be used in portable or stationary mode.
Record your data (up to 1200 points) and transfer it to the removable display memory or opt for continuous measurement and unlimited recording via an external power supply.
Save time and simplify your decontamination procedures with the NSN3's detachable display. Only decontamination of this removable accessory is required before leaving the controlled area.

Choose reliability with high accuracy measurements and data collectionChoose reliability with high accuracy measurements and data collection

The high sensitivity of the portable survey meter provides reliable, accurate measurements over the energy range from thermal neutrons (0.025 eV) to fast neutrons (15 MeV).
It has excellent gamma rejection.
This performance is comparable to that of a transportable device (with heavy moderator). 
The dose rate measurement range extends from 0.01μSv/hr to 99.99 mSv/hr with an accuracy of ≤ ±20% at 10 μSv/hr.
The dose measurement range extends from 0.01μSv to 99.99 mSv with an accuracy of ≤ ±20% to 1 μSv.
Be confident in your measurements: the NSN3 survey meter is approved by CTHIR to IEC610005 edition 3, 2014.

Make it easy to retrieve the data collected   

The survey meter is equipped with a USB drive to display and share collected data on a PC. 


Applications and fields of use of the neutron survey meterApplications and fields of use of the neutron survey meter

The neutron survey meter is designed for:

  • Radiation protection of workers exposed to radiation,
  • The search for neutron sources or the presence of radionuclides,
  • Detection and monitoring of radiological contamination,

It is perfectly adapted to the requirements and applications of:

  • Nuclear power plants,
  • Synchrotrons, particle accelerators,
  • Fusion reactors,
  • Experimental reactors,
  • Particle physics laboratories,
  • Decommissioning activities
  • Spent fuel processing and transport facilities
  • Civil security: protection of first responders
  • Industrial activities and non-destructive testing


Neutron survey meter documentation