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LB 6414 Neutron Survey

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  • Search for illicit trafficking plutonium
  • Search for plutonium contamination
  • Measurement of Pu-240 equivalent mass
  • Nuclear waste inspection
  • Measurement of Cf-252 and other neutron sources
  • Monitoring of neutron radiation field intensities

The LB 6414 is a portable neutron survey meter with extremely high sensitivity. The energy dependent response of the instrument was maximized for fission neutrons.

Data sheet

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Stefan Mårtensson

Stefan

Technical specification

Neutron detector: He-3 proportional counter tube in PE moderator
Fluence response: 26,4 cm² for fission neutrons response: 10,7 cm² for Am-Be
Detection limit: 75 g weapon´s plutonium in 5 s (distance 1 m)
Neutron energy range: Optimized for 10 keV to 1000 keV 
Pu-240 equivalent mass response: 0,2 cps per g of Pu-240 at 1 m distance
Ambient dose equivalent response to H*(10): 27 counts/nSv or 0,13 µSv/h per cps for Am-Be;  68 counts/nSv or 0,05 µSv/h per cps for Cf-252
Directional response: 100% at normal incidence, 78% sideways, 60% frontal for Am-Be
Dimensions probe: 310 mm x 180 mm x 130 mm (Length x Width x Height)
Weight of probe: 3850 g
Typical background rate: 0.06 cps
Intrinsic detector background:< 0.006 cps at total neutron flux φn < 2 x 10-4 cm-2 s-1


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