Coaxial HPGe Detector with Lead Shield is used to measure the specific gamma radiation of radionuclides from various types of environmental objects such as rocks, minerals, sludge, slag, soil, plant, sediment and particulate matter in air and water.
Ordering information
For LN2 cooled dipstick HPGe detection units:
For electrically cooled HPGe detection units (Monolith):
Foe hybrid cooled dipstick HPGe detection units (Nicole):
| Parameter | Value |
|---|---|
| Detection limit for Cs137 radionuclide specific activity, measurement time 1 hour, Bq/kg | 0.5 |
| Absolute sensitivity to gamma flux for 30% efficient detector, pulse/quantum | 4.5 x 10-3 |
| Instrumental background intensity for energy range from 40 KeV to 3 MeV, pulse/KeV x sec | 5 x 10-4 |
| Cs137 radionuclide specific activity measurement error for measurement time 1 hour, % | 20 |
| Shield thickness: Lead wall, mm Copper wall, mm | 100 10 |
| AC power supply: Voltage, V Frequency, Hz | 230 50 |
| Overall dimension, mm Lead shield with detector Spectrometric device | 1300x580x480 300x180x80 |
| Weight, kg Lead shield with detector Spectrometric device | 725 2 |
| Detection Unit (example) | |
| Relative efficiency (with respect to 3’’ x 3’’ NaI detector and Co-60 source mounted 25 cm above the endcap) at 1.33 MeV g-photon, % | > 30 |
| Energy resolution with LN2, eV at 122 keV at 1.33 MeV | < 850 < 1850 |
| Peak to Compton ratio at 1.33 MeV | 60 : 1 |
| Energy range of detector operation, keV | 40 – 10000 |
| Material of input window | Al/Be/Carbon |
| Endcap diameter, mm | 83 |
| Preamplifier SHP (built in detector capsule) with cooled FET and resistive feedback - Preamplifier power supply is ±12 V with 9 pin connector compatible with NIM standards - TTL signal to shut down the HV: - detector warm -0V; - detector cold: +5V - HV INHIBIT – BNC - Preamplifier and High voltage filter included - Automatic high-voltage shutdown to protect preamplifier input FET | |
| 2 LEDs on the separate cable end from preamplifier: - GREEN – detector is cooled down - RED – high count rate | |
| Cable connectors: - 9 pin – PA Power supply; - 11 SHV - detector bias power supply; - BNC - signal output of detector | |
| Indicator warns of excessive counting rate |
