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Wall-mounted neutron detector (Ludlum 42-30H) for area monitoring in WebiSmarts
Wall-mounted proportional neutron detector for area monitoring, supplied by Rotem for its systems. The detector is a Ludlum Model 42-30H in a 25.4 cm polyethylene sphere and detects thermal and fast neutrons, from 0.025 eV to approximately 12 MeV, through nuclear reactions that produce charged particles.
Download product sheet (PDF)All values with references – for tender documents
Specifications checked against the manufacturer’s documents on 2026-10-17
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
| Detector | Proportional neutron detector Ludlum Model 42-30H; moderator: polyethylene sphere ø25.4 cm1 |
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| Gamma rejection | 10 cpm or less up to 0.1 Sv/h (10 R/h)1 |
| Energy range | Thermal to approx. 12 MeV1 |
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| Energy response | Approximately follows the radiation protection guide curve for neutron dose2 |
| Sensitivity | Typically 20,000 cpm per mSv/h (200 cpm per mrem/h), AmBe1 |
| Detector high voltage | Typically 1,200 V1 |
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| Mounting | Wall mount (bracket included)2 |
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| Dimensions | 38.1 × 25.4 × 26.2 cm (H × W × L) including bracket1 |
| Weight | 8.8 kg (19.5 lb)1 |
| Operating temperature | −15 to +50 °C1 |
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| Ordering code | BAK-2459; 42-30 detector with wall bracket BAK-12901 |
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The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
Ethernet area monitor with PoE for WebiSmarts, with or without an internal detector
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Neutron rem counter for pulsed fields
Gamma-neutron portal monitor
We help you choose the right configuration, detector and accessories for your measurement task.
Rotem Industries