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CHM-12 Neutron Detector with Preamplifier

The GS-Neutron MKII released November 2016 is an easy to use neutron detector with excellent gamma rejection. This challenging product has been under development for some time and we now have an excellent working product.. Our goal was to develop a useful neutron detector from relatively low cost Russian corona tubes (CHM-12 and others). These tubes are famously difficult to work with as they are terribly noisy and the neutron pulse is weak and short, many people have bought these tubes and given up after spending hours trying to get them to work. The new GS-Neutron-015 has a very stable circuit with a completely steady baseline and strong neutron pulse. The detector is completely blind to gamma radiation and is not easily affected by EMF as many other detectors are. 

At 15% efficiency this detector is

about 125 times more sensitive

than a typical BTI bubble detector (33 BpmR)

The preamplifier circuit has an adjustable lower limit threshold (LLD) and hysteresis setting to allow for fine tuning of noisy signals. 

The detector comes supplied with one 9V battery, which will power the detector for approximately 50-100 hours.

This detector is best powered by a GS-1100-PRO as it requires only 500V, as voltage drift is not an issue it will also work with a modified GS-1100A (send us a query if you want to do this mod). 

Connectivity

The GS-Neutron-150 requires an external DC power source to provide 450 to 475 volts DC high voltage, high impedance bias, we suggest our GS-1100-PRO

The signal output from this detector connects directly to the PC Line In port. It does not work well with the Mic port so for computers without a Line In port we recommend using an external USB sound card. 

 

CHM-12 Tube Specifications

  1. Corona discharge Voltage, MIN..................... 450 V
  2. Recommended working voltage MAX............ 500 V
  3. Relative efficiency (nvth)................................ 15%     (may vary from tube to tube)
  4. Background counts........................................ 12 cph.
  5. Working temperature range ......................... -50 to +100 C˚
  6. Tube working life, not less than.................... 1500 h.
  7. Shelf life, not less than 4 years.
  8. Weight........................................................ 200 gr. (tube only)
  9. Dimensions................................................ length 215mm diameter 8.5 mm
     

Preamp and Build

  1. Moderator ................................................ Black HDPE
  2. Moderator diameter ................................. 90 mm
  3. Preamplifier power (battery)..................... 9V 
  4. HV Connector ......................................... BNC
  5. Signal connector ...................................... 3.5 mm Audio Jack (mono)
  6. Output pulse ........................................... 1.7 V 150 µS
  7. Overall dimensions ................................. H 320 mm x 90 mm Ø  


Still have questions? .......... Contact us

 

Important Notes

These detectors are built from old tube stock and the efficiency may vary from tube to tube,

we shall do our best to test that the tubes are working, but we do not offer a calibration guarantee at this time. 

 

Hobbyists wanting to roll their own tubes, see separate listing for preamplifier board, click here.

 

 

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Neutron Detector

  • USD 449.00


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Tags: neutron detector, snm-12, scm-12

Refund & Return Policy

We want you to be 100% happy with your Gammaspectacular product, and offer free after sales support to get you up and running.

If you for any reason you require a refund or replacement, please contact us within 30 days of purchase to arrange the return.
Return shipping cost and risk is the sole responsibility of the buyer.

Return shipping address: Bee Research, Po Box 6259, Alexandria, NSW 2020, Australia