Portable radiation detectors
Scintillation sensitivity in a 90 g instrument you run with one button: dose rate, accumulated dose, alarms and a built-in Food Check.
Built around a scintillation sensor
CsI(Tl) sensor
2,000–3,000 CPM/µSv/h (Cs-137): many times the counts of a typical GM tube, so readings settle faster and low levels become visible.
Full-face display
128 × 240 backlit LCD with a 2-minute trend graph, statistical uncertainty (±%) and Korean or English screens.
One button
Short press to move between menus, long press to act. Alarm level, averaging time and sound are set on the device.
Ready for the field
IP64, 1 m drop, about 3 days per charge with auto backlight and USB charging.
From counts to Bq/kg, on the device
QSF104, QSF104B and QSF104F calculate the detection limit and the Food Check result themselves, at 95% confidence (2σ). No manual count logging or calculation needed.
- Measure the background for 30 minutes with a water-filled container.
- Measure the food sample in the same container for 30 minutes.
- Read the result: “ND < limit” or the activity ± 2σ in Bq/kg.
Limit 73 Bq/kg
Not detected
346 ± 78 Bq/kg
Choose your model
QSF104
StandardGamma and X-ray detector with built-in Food Check.
View details →
QSF104B
Beta+Adds beta detection for surface contamination checks.
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QSF104F
Food+Highest sensitivity in the series for food screening.
View details →
QSF104m
EntryEntry model with beta, gamma and X-ray detection.
View details →| QSF104 | QSF104B | QSF104F | QSF104m | |
|---|---|---|---|---|
| Radiation | Gamma, X-ray | Beta, gamma, X-ray | Beta, gamma, X-ray | Beta, gamma, X-ray |
| Energy range | 50 keV – 6 MeV | 10 keV – 6 MeV | 10 keV – 6 MeV | 100 keV – 6 MeV |
| Gamma sensitivityCs-137 | ≥ 2,000 CPM/µSv/h | ≥ 2,000 CPM/µSv/h | ≥ 3,000 CPM/µSv/h | ≥ 800 CPM/µSv/h |
| Beta sensitivitySr-90 0.1 µCi at 1 cm | – | 6,000 CPM | 8,000 CPM | 2,000 CPM |
| Food Check (Bq/kg) | O | O | O | X |
| Menus | 9 | 9 | 9 | 8 |
Common specifications
| Sensor | CsI(Tl) scintillator + photodiode, 1.5 mm aluminum EMI shield |
|---|---|
| Dose rate / accumulated dose | 0.001 – 100 µSv/h / 0.001 µSv – 999.9 mSv |
| Total count / count rate | 0 – 999 M counts / 0 – 99,999 CPM |
| Accuracy | 15% or 0.05 µSv/h (Cs-137) |
| Display | Monochrome 128 × 240 dots, backlight, Korean / English (firmware option) |
| Alarm | 2-color LED (green / red), magnetic buzzer ≥ 60 dB |
| Battery | Li-polymer 3.7 V 1,200 mAh, USB 5 V charging; about 6 h (backlight on) / 3 days (auto off) |
| Size · weight | 95 × 60 × 17 mm, 90 g; ABS body with aluminum front plate |
| Environment | −10 – 50 °C, 20–90% RH (non-condensing), IP64, 1 m drop |
| In the box | Detector, USB charger and cable, user manual |
Accessories and services
Food measuring container
Dedicated container the Food Check is calibrated for. Required for Bq/kg results.
Lead shield (14 mm)
Cuts the natural background to one-fifth or less and lowers the detection limit well below 100 Bq/kg.
Cs-137 reference source
100 Bq/kg reference solution to check the sensitivity constant yourself.
Silicone protective case
Grip and drop protection for daily field use.
USB communication
Data output with collection software for logging on a PC.
Calibration certificate
In-house calibration report or KOLAS-accredited calibration on request.
Catalogs and manuals
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