The Contamination Monitor with Dose Rate Detector LB 124 SCINT-D is used to measure radioactive alpha and beta-gamma contaminations on surfaces such as floors, walls, desks, objects, clothing or skin as well as gamma dose rate in ambient dose rate equivalent H*(10).
Features
Highlights:
- Lightweight, easy to handle and rugged instrument
- Wide temperature range
Contamination Detector
- Simultaneous and separate measurement of alpha and beta-gamma contamination with a ZnS(Ag)-scintillation detector
- High sensitivity and uniform response
- No counting gas required
Dose Rate Detector
- Detector positioned parallel to the front side of the instrument
- Energy response to H*(10) Ambient Dose Equivalent
- Halogen quenched Geiger-Müller tube
- Dynamic Range: 0.1 μSv/h to 20 mSv/h
- Energy Range: 50 keV to 1.3 MeV
- Alarm threshold for dose rate measurement
- Unit selection: μSv/h
- Dose accumulation is possible
| Instrument | |
| Display | Monochrome LCD 192 x 64 pixel Electro-luminescence illumination |
| Radiation detector | ZnS(Ag) scintillator + Geiger-Müller tube |
| Detection of light | Photomultiplier (PMT) |
| Measurement modes | α- and β-γ-measurement, simultaneous and separate, additional gamma dose rate H*(10) ratemeter, scaler-timer-mode, clearance measurement, survey mode |
| Entrance window’s dimensions | 118 mm × 145 mm |
| Sensitive area | 170 cm² |
| Entrance window’s material | 2 x 3 μm Plastic metallized (0.4 mg/cm²) |
| Protective Grid | 80 % Transmission |
| External dimensions | 240 mm × 140 mm × 110 mm (L x W x H) |
| Weight | 1400 g (with batteries) |
| Alarm | Acoustic with adjustable alarm thresholds |
| Data memory | 1000 measured values with date & time |
| Interface | RS232, headphone connection |
| Power supply | 3 × C size batteries or NiMH batteries, rechargeable by plug type power supply or alternatively in the wall mounting bracket |
| Max. operating time (without illumination) | > 50 h with alkaline batteries 7.8 Ah > 25 h with NiMH batteries 4.5 Ah |
| Ambient Conditions | |
| Temperature range | -20 °C to +40 °C (operation) -40 °C to +60 °C (storage) |
| Relative humidity | 0 % to 80 % (no condensation) |
| External pressure | 500 to 1300 hPa (operation) 100 to 1300 hPa (storage/transport) |
| Protection class | IP 53 (according to IEC 60529) |
| Typical Efficiencies (according to ISO 7503-1) |
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| Contamination Detector: | |||
| 241Am | 44 % | (α-channel) | |
| 239Pu | 41 % | (α-channel) | |
| 14C | 29 % | (β-γ-channel) | |
| 36Cl | 69 % | (β-γ-channel) | |
| 60Co | 58 % | (β-γ-channel) | |
| 137Cs | 71 % | (β-γ-channel) | |
| Background | approx. 0.1 cps approx. 10 cps |
(α-channel) (β-γ-channel) |
|
| Gamma sensitivity at 1 µSv/h (137Cs) |
not detectable < 100 cps |
(α-channel) (β-γ-channel) |
|
| Spillover | < 20 % < 2 x 10-5 |
(α- to β-γ-channel) (β-γ- to α-channel) |
|
| Measuring range (Dead time < 10 %) |
0 to 5.000 cps 0 to 50.000 cps |
(α-channel) (β-γ-channel) |
|
| Overrange indication | at rates > 50.000 cps |
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| Suface response uniformity |
max. ± 20 % | (α-channel with 241Am, β-γ-channel with 14C point sources) |
|
| Gamma Radiation Detector: | |||
| Dose rate range | 0.1 µSv/h to 20 mSv/h | ||
| Energy range | 50 keV to 1.3 MeV | ||
| Calibration factor | 0.625 µSv/h per cps 137Cs | ||
| Intr. background | approx. 0.07 cps | ||
