Environmental gamma dose rate transmitter
RadGM  Environmental gamma dose rate transmitter


  • Nuclear facilities
  • Radiation monitoring
  • Environment survey
  • Mobile monitoring systems
  • Process control: level-, concentration-, density measurement
  • Environmental dose rate measurement H*(10) measurements
  • High sensitivity
  • Wide measuring range
  • Quick operation
  • Full parameter programming
  • Excellent reliability, control of measurement data
  • Special average calculation, handling of outstanding values
  • Freely adjustable fix and dynamic alarm thresholds
  • Dose rate dependent count sound signal
  • Multiple configurable outlets for alerting and alarming purpose
  • Input for acknowledging alarms

The RadGM is a highly sensitive gamma radiation meter with a wide measurement range. The device was engineered for continuous operation even under extreme meteorological conditions. The instrument have a closed housing, it does not have external physical buttons and can only be controlled remotely. It can be installed on monitoring stations, vehicles or even on aerial vehicles. In industrial applications it can measure the level of solid and liquid materials in different containers and silos. Due to the special algorithm applied in the instrument close to background level radiation increases can be detected as well without raising the number of false alarms. The RadGM can be connected to a PC, data collector unit or PLC via standard industrial RS-485 connection.

Technical parameters

One or two GM-tubes

Nuclear parameters
according to IEC 61017
environmental dose equivalent H*(10) and
environmental dose rate equivalent H*(10)

Measurement range
Two GM-tubes: 60 nSv/h ... 100 Sv/h (-15% ... +22%)
One GM-tube: 60 nSv/h ... 20 mSv/h (-15% ... +22%)
Dose: 50 nSv... 1000 Sv

Indication range
40 nSv/h ... 120 Sv/h at most

Energy range
50 keV ... 1,5 MeV

Energy dependence
< ±30% in the effective energy range (83 keV ...1,5 MeV)
Angular dependence
< ±30% 2 π solid angle

Set-up time
5 s

Measuring time
Continuous, 2 s ... 3600 s

Launched measurement
(with software): user initiated
measurement with adjustable
measurement time. Storage and
query of launched measurements.

Self diagnostics, automatic recovery
after the error disappears

RS-485, max 115200 Bps speed
(MODBUS protocol)

Number of devices on one cable
max. 32
Calibration and test
Through remote access

Power source
9 VDC ... 32 VDC

Power consumption
12VDC @ 45 mA (540 mW)
Energy saving mode, after initiating a
launched measurement: 12VDC @ 5 mA (60 mW)

Operational temperature range
-40 °C ... +65 °C

Environmental resistance
Closed housing, IP67

Dimensions, weight:
HxWxL 150x125x90 mm, 0,78 kg

Software (optional)
Windows based software to query the
instrument data, to access instrument settings
and control