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Model 42-38

The Ludlum Model 42-38 WENDI-2 (Wide Energy Neutron Detection Instrument) Neutron Detector is designed for detection of thermal and fast neutrons (0.025 eV to approximately 5 GeV). The neutrons are not directly detected, but through nuclear reactions, which result in energetic charged particles such as protons and tritons. In many instances, intense fields of gamma rays are also found with neutrons. Therefore, it is important to choose a method of neutron detection with the ability to discriminate against these gamma rays in the detection process.

A common reaction for the conversion of slow neutrons into directly detectable particles is n + 3He → 3H + 1H + 0.764 MeV. The Ludlum Model 42-38 WENDI-2 utilizes this reaction in the form of helium-3 (3He), which fills the gas proportional tube of the detector.

This detector is typically used with area monitors, such as Ludlum Models 375, 3276, and 177-61. It can also be used with with portable survey meters.

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Headphone Jack

This modification for survey meters adds a headphone jack to the instrument body so headphones can be used to monitor click-per-event audio and audio alarms. Headphones are helpful when the instrument is being used in areas with high ambient noise levels or in areas where the audio would be distracting to others, such as in a medical or office environment.

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Shoulder Strap

This 1.8 m (6 ft) adjustable shoulder strap is a great way to keep your hands free while operating survey meters. The nylon strap with a wide rubber comfort pad can also be helpful for conveying some of the heavier instrument/detector combinations in the field. 

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Model 3-IS NORM Kit
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Model 14C-MERK
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Model 2241-3MERK
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Model 3001-MERK
Medical Environment Response Kit
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Model 14C-RK
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Cables

Ludlum offers straight cables with either type C, BNC, SHV, MHV, or UHF connectors. Unless specified otherwise, Ludlum survey meters and detectors are shipped with “C” type connectors. When a meter and accompanying probe are ordered as a matched set, Ludlum automatically includes a 99 cm (39 in.) straight-type cable with “C” connectors at no additional charge. (Note: We no longer offer coiled cables.)

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Model 3002/FM Series
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  • Active Window Area: 400 or 1080 cm2 (62 or 167.4 in2)
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Model 42-38
WENDI-2 Wide Energy Neutron Detector
  • Detector Type:
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    • Moderator: 22.9 cm (9 in.) dia.
  • Sensitivity (241Am/Be): 450 cpm per mrem/hr
  • Detection Range: Thermal to 5 GeV
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  • Extends to 3.6 m (12 ft.)
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Model 78-6
Stretch Scope Survey Meter
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Model 79/2
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Model 79/1
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Model 79
Stretch Scope Survey Meter
  • Digital Meter
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  • Energy-Compensated GM Detector
  • Range: 10 µSv/h to 10 Sv/h (1 mR/hr to 1000 R/hr)

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