If you have found yourself asking "what instruments can detect radiation?" — you are not alone. Radiation is invisible, odorless, and completely undetectable by human senses. The only way to know whether you are being exposed, and at what level, is to use a dedicated instrument designed for exactly that purpose.
This guide explains the main types of radiation detection instruments available today, who uses each type, and why the CESTSEN GM-100 Series Personal Dosimeter is one of the most practical choices for individuals and professionals who need reliable personal radiation monitoring.
Ionizing radiation — emitted by radioactive materials, X-ray machines, and natural sources — exists at low background levels everywhere on Earth. In most everyday situations, natural background radiation poses no significant health risk. However, radiation levels can be significantly elevated in certain environments:
In all these situations, a radiation detection instrument is the only reliable way to know your actual exposure level.
Who uses them: Individual radiation workers, medical staff, industrial personnel
Personal dosimeters are worn or carried by a specific person to continuously monitor their individual radiation exposure throughout a working day. They display real-time dose rate readings and accumulated total dose, and trigger alarms when pre-set thresholds are exceeded.
Key features to look for: dual alarm modes, dose accumulation counter, compact wearable form factor, wide measurement range.
Best example: CESTSEN GM-100H / GM-100M
Who uses them: Radiation safety officers, field engineers, inspection teams
Handheld survey meters are used for area scanning and spot-check measurements — sweeping a room, checking equipment leakage, or surveying a site for contamination. They are larger than personal dosimeters and optimized for fast, reliable field readings.
Best example: CESTSEN MR-50, MR-50EXP, GM-300 series
Who uses them: Hospitals, nuclear facilities, industrial plants, customs authorities
Wall-mounted permanently installed monitors provide continuous 24/7 area monitoring at fixed locations — X-ray rooms, furnace charging areas, perimeter gates. They connect to alarm systems, building management platforms, and cloud monitoring services.
Best example: CESTSEN MR-50X/L, GM-R200 system
Who uses them: System integrators, facility engineers, OEM developers
RS485-output sensor probes serve as detection nodes in multi-point monitoring networks, connecting to central host controllers via standard industrial protocols.
Best example: CESTSEN RAD-S104, RAD-S101, RAD-S200 series
Who uses them: Environmental agencies, nuclear medicine departments, research institutions
Includes radon detectors, submersible wastewater radioactivity detectors, negative ion testers, and atmospheric ozone analyzers — each designed for a specific measurement application.
Best example: CESTSEN RAD-1750 (radon), RAD-S300 (wastewater), KEC900+II (negative ions)
For most individuals and professionals just beginning to address radiation safety, a personal dosimeter is the most practical first instrument. It is:
Among personal dosimeters available in the Chinese domestic market, the CESTSEN GM-100 series consistently stands out for its combination of professional sensor technology, dual alarm capability, and competitive factory-direct pricing.
The GM-100 series is developed by Shenzhen WanYi Technology Co., Ltd. (CESTSEN / ONETEST Technology) and is available in two variants optimized for different radiation environments:
| Model | Sensor | Ray Types | Measurement Range | Best For |
|---|---|---|---|---|
| GM-100H | All-metal GM tube (Russia) | Hard β, γ, X-rays | 0.01 μSv/h – 50 mSv/h | General radiation worker dosimetry |
| GM-100M | Glass GM tube | γ and X-rays | 0.01 μSv/h – 100 mSv/h | High dose rate environments |
| Parameter | Specification |
|---|---|
| Sensor Type | All-metal Geiger-Müller tube — imported from Russia |
| Sensitivity | 2100 cpm/mR/h |
| Energy Response | 50 keV – 1.3 MeV |
| Measurement Accuracy | ±18% |
| Sensor Service Life | 1 × 10⁹ counts |
| Alarm Mode | Sound AND shock (vibration) — independent switches |
| Alarm Setting | User-configurable automatic alarm values |
| Measurement Units | μSv/h, mSv/h, CPS, mSv (accumulated) |
| Total Dose | Automatic accumulation + manual reset |
| Maximum Hold | ✅ Auto maximum value retention |
| Curve Display | ✅ 1-hour trend with max & average calculation |
| Measurement Mode | Rapid and smooth modes |
| Language | Chinese / English bilingual |
| Power Supply | 1 × AA dry battery |
| Operating Environment | -30°C to 60°C, 5%–95% RH |
| Dimensions | 74 × 58 × 29 mm |
| Weight | 80 grams |
| Certification | CE, CMA & CNAS accredited test reports |
The GM-100H uses an all-metal Geiger-Müller counter imported from Russia — the same sensor technology at the core of European professional dosimeters. With a sensitivity of 2100 cpm/mR/h, it responds quickly and reliably to radiation field changes, even at low dose rates typical of medical and office environments.
The independent sound and vibration (shock) alarm switches ensure you receive radiation alerts regardless of your environment. Silent vibration mode is ideal for clinical settings; sound mode provides clear audible warning in low-noise environments. Both can run simultaneously for maximum alertness.
The GM-100H continuously accumulates your total radiation dose from power-on — enabling shift-by-shift tracking against regulatory dose constraints. Manual reset at the start of each working period keeps records clean and organized.
At just 80 grams and 74 × 58 × 29 mm, the GM-100H is smaller and lighter than a standard TV remote control. It clips to a breast pocket or belt without any ergonomic burden — meaning radiation workers actually wear it continuously rather than leaving it on a desk.
Running on a single standard AA dry battery — available in any convenience store worldwide — the GM-100H is always ready, even during power outages or in remote field locations where charging infrastructure may not be available.
| User Profile | Why GM-100H Is Right |
|---|---|
| Hospital radiology staff | Real-time dose rate + accumulated dose tracking alongside TLD badge |
| Nuclear medicine technicians | High sensitivity detects Tc-99m, I-131, Co-60, Cs-137 exposure |
| Dental and veterinary X-ray workers | Compact wearable with vibration alarm for clinical environments |
| Industrial NDT radiographers | Wide temperature range (-30°C to 60°C) for field use |
| Building material inspectors | Quick check of stone and construction material gamma emission |
| Emergency responders | Instant personal radiation awareness in incident response scenarios |
Shenzhen WanYi Technology holds a government-issued Radiation Safety License, calibrates instruments with Co-60 and Cs-137 standard sources, and carries CE, CMA, CNAS, ISO 9001, and ISO 14001 certifications. Every GM-100H ships factory-calibrated with a one-year warranty and free engineer onboarding support.
📩 Request Pricing and Product Specifications:
- 🌐 www.cestsen.com
- 📞 0755-29058210
- 📍 Guangming District, Shenzhen, China
