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PN 25/PN 50™

B-10 Proportional Counters

Neutron flux detectors for the source range

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Data Sheet

Tag Features

  • Wide thermal neutron flux range
  • Robust design, uniform sensitivity
  • High temperature range (up to 200 °C)
  • Available in various lengths with sensitivities up to 15 cps/nv
  • Connectorized (HN connectors) or with integral mineral insulated cable (PN 50)
  • Suitable for long-term operation in high radiation environment (w/o organic materials)
  • Integral MI cable with PEEK layer for mechanical protection and electrical insulation (PN 50)
  • Environmental and seismic qualification

Description

The B 10 proportional counters of type PN 25 and PN 50 are designed to measure the neutron flux outside the reactor core in the source range during reactor start-up. The detector signal consists of charge pulses that are generated in the active gas volume of the B 10 proportional counter by either the lithium nucleus or the alpha particle resulting from the B 10 (n, α) Li 7 reaction.

These detectors are available with a neutron sensitivity of 4.5 cps/nv for the PN 25 and from 5 to 15 cps/nv depending on the sensitive length for the PN 50. The typical thermal neutron flux range covered with these detectors is therefore approx. 0.1 nv to 3E+5 nv.

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