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Very high-efficiency neutron spectrometer, from thermal to 10 GeV
All-in-one active neutron spectrometer with very high counting efficiency, for on-line spectrometry and absolute flux measurements. A ⁴He gas scintillator with LiF converter is read out by SiPMs and surrounded by moderators forming four sub-volumes; the built-in electronics unfold the spectrum directly. HERMES W-PIE is a lighter standalone version for up to about 100 MeV with battery, 4G and GPS.
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 type | ⁴He gas scintillator (12 L cylinder) with LiF converter and 24 low-voltage SiPMs; four moderator sub-volumes; ³He-free1 |
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| Energy range | Thermal to 10 GeV (W-PIE); to about 100 MeV (HERMES W-PIE)1 |
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| Typical neutron sensitivity | Approx. 4,000 counts per hour in typical ground-level cosmic neutron background1 |
| Gamma sensitivity | Completely insensitive up to >10 mSv/h (¹³⁷Cs)1 |
| Software | Built-in unfolding algorithm for on-line spectrum analysis; raw data can be saved for off-line analysis1 |
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| Communication | W-PIE: Power over Ethernet and Ethernet to a PC; HERMES W-PIE: battery, single-board computer, 4G router, GPS and dual SIM for remote control1 |
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| Power supply | W-PIE: Power over Ethernet; HERMES W-PIE: battery powered1 |
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| Dimensions | Ø50 × 100 cm (W-PIE); Ø40 × 100 cm (HERMES W-PIE)1 |
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| Weight | Approx. 120 kg (W-PIE); approx. 40 kg (HERMES W-PIE)1 |
| Options | HERMES W-PIE low-energy version; traceable calibration (1 dose-rate point, Am-Be), outdoor long-term mounting kit, photovoltaic power supply and warranty extension (24 months) on request1 |
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| Use | Homeland security, cargo inspection, calibration laboratories, background suppression in high-energy physics, cosmic-ray neutron sensing (CRNS) in agriculture and snow water equivalent (SWE) in hydrology2 |
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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.
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We help you choose the right configuration, detector and accessories for your measurement task.
ELSE NUCLEAR