Based on the tremendous success of the Hidex 300 SL Automatic TDCR liquid scintillation counter Hidex has developed a new instrument for challenging low radioactivity applications.
The Hidex 300 SL super low-level scintillation counter is equipped with additional lead shielding, low level PMT detectors and an active guard detector for further background reduction. The instrument is ideal for 3H in water measurements as well as other low-level environmental monitoring, radiocarbon dating and biofuel verification applications.
The advanced Active Guard is a separate scintillator detector which detects and subtracts real-time background radiation. The guard can be turned off for high energy samples and does not interfere with alpha/beta separation.
Digital Pb shield is a proprietary Hidex spectral fitting algorithm that improves counting performance by utilizing spectrum information for active sample tritium counts and background counts.
New Active Guard for low level environmental measurements:
- 3H & 14C in natural waters
- ground water dating (3H)
- 90Y/90Sr
- gross alpha/beta
- biobased 14C
- low level alphas
- 55Fe, 66Ni
- 3H & 90Sr radiobioassays
Models and technical data
Standard #425-201
- Sample capacity, 20mL/7mL: 40/96
- Counting efficiency 3 H/14C (%): 70/96
- Background 3 H in water (CPM): 12
- Dimensions, W/H/D (cm): 52/68/63
- Weight (kg): 125
Super Low Level #425-020
- Sample capacity, 20mL/7mL: 40/96
- Counting efficiency 3 H/14C (%): 70/96
- Background 3 H in water (CPM): 3
- Dimensions, W/H/D (cm): 52/68/63
- Weight (kg): 180
Metrology #425-202
- Sample capacity, 20mL/7mL: 40/96
- Counting efficiency 3 H/14C (%): 70/96
- Background 3 H in water (CPM): 12
- Dimensions, W/H/D (cm): 52/68/63
- Weight (kg): 125
Hidex 600 SL #425-206
- Sample capacity, 20mL/7mL: 210/500
- Counting efficiency 3 H/14C (%): 70/96
- Background 3 H in water (CPM): 12
- Dimensions, W/H/D (cm): 125/69/64
- Weight (kg): 200
Optional features
- 525-003 alpha/beta separation
- 462-019 External Eu-152 std source
- 425-2001 Cooling
- 425-018 LL PM tubes
Performance Specifications
All the measurements are performed at temperature of 22°C ± 2°C and at normal humidity conditions of Hidex laboratory, Turku, Finland (relative humidity not measured). Background may vary locally depending on natural environmental radiation.
Counting efficiency
- Counting efficiency typical > 70 % for 3 H and typical > 96 % for 14C with unquenched samples.
- > 35 % for 3 H quenched (8 mL water sample + 12 mL AquaLight cocktail)
- α’s (210Po, 234U/238U, 241Am, 222Rn, 226Ra) > 95 %
Typical background
- < 3 CPM with 8 mL water + 12 mL AquaLight Low Level cocktail. *Background value measured using window with 25 % counting efficiency.
- < 0.3 CPM for alphas (with a/b separation option)
FOM (E2/B)
- 3 H in water, optimized window > 220
- 3 H in water, with Digital Pb shield > 300
- 3 H unquenched Low Level standards, optimized window > 350
- 14C unquenched Low Level standards, optimized window > 1150
- 14C Benzene 3.5 ml in a mini glass vial > 2000 (71 % window / 2.5 CPM background)
