ELSE NUCLEAR
ELSE NUCLEAR
HERMES GSU
Portable gamma spectrometry
- Detector type
- 2 × 2 inch NaI(Tl), SiPM
- Energy range
- 30 keV–3 MeV
- Typical energy resolution, Cs-137
- Below 7.5%
12 referenced values
Bild: ELSE NUCLEAR
GSU
Shielded NaI(Tl) spectrometry unit for small samples
Gamma spectrometry unit with a 3 × 3 in NaI(Tl) crystal in a lead well with inner tin and copper layers. It measures small samples such as foundry castings, air filters and environmental samples in sample holders or Marinelli beakers, and calculates specific activity and MDC. The GSU-NORM version determines naturally occurring ⁴⁰K, ²³²Th and ²³⁸U in rocks, sediments and soils.
- Detector type
- NaI(Tl) 3 × 3 in with PMT or SiPM and MCA1
- Energy range
- 30 keV–3 MeV2
- Spectrum channels
- Up to 2,0482
Download product sheet (PDF)All values with references – for tender documents
Specifications checked against the manufacturer’s documents on 2026-10-17
Overview
Key features
- Background subtraction lowers the MDC without longer counting
- Customisable isotope libraries and alarm thresholds
- Efficiency curves from Monte Carlo simulations, validated with reference sources
Specifications
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
| Detector type | NaI(Tl) 3 × 3 in with PMT or SiPM and MCA1 |
|---|---|
| Sample geometry | Sample holders fitting the detector head, or Marinelli beakers 250 mL–1 L1 |
Performance
| Energy resolution at 662 keV | <7.5%2 |
|---|
Measuring range
| Energy range | 30 keV–3 MeV2 |
|---|
Electronics & signal
| Spectrum channels | Up to 2,0482 |
|---|
Software & data
| Software | ELSE GSU software: specific activity and MDC (Bq/kg, Bq/l, Bq/m³), background subtraction, customisable isotope libraries and password-protected isotope-specific alarm thresholds1 |
|---|
Mechanical
| Total weight | 240 kg including support2 |
|---|
Ordering & accessories
| Options | NORM version, 10 cm lead well, other detector size or type; calibration sources and warranty extension (24 months) on request2 |
|---|
General
| Lead shielding | 5 cm lead with 1 mm tin and 1 mm copper layers; 10 cm lead well as an option2 |
|---|---|
| Typical MDC | Casting samples: 0.02 Bq/g for ¹³⁷Cs in 300 s; GSU-NORM: 0.002 Bq/g ⁴⁰K, 0.001 Bq/g ²³⁸U and 0.003 Bq/g ²³²Th in 6 h2 |
The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.
Documents
Sources
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.
- 1
- 2
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8 referenced values
Contact us
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Oscar ÅgerstamFounder & CEO