Features

• Measuring range from 100 nSv/h up to 100 mSv/h resp. 1 Sv/h
• One proportional counter tube for the entire range
• Sensitivity starts at 30 keV
• The instrument can be calibrated in "air kerma" or in the new ICRU-units "ambient dose equivalent"
• Simultaneous operation of internal and external detectors
• Very simple operation
• Configuration and data read out via PC
• Storage of up to 256 data records
• Waterproof (IP 67) and shock resistant
• ADF mode (Advanced Digital Filter)

The FH 40 G is a wide range survey meter, suitable for nearly all measurement tasks arising in radiation protection:

• Classic survey meter for personal radiation protection
• Stationary gamma dose rate meter
• System center with external probes for monitoring and detection
• Simultaneous and discriminative gamma and neutron measurement in mixed radiation fields, for x-ray/gamma dose rate and beta contamination, for the highly sensitive proof of artificial gamma radiation even in variable natural radiation fields....
• System component in complex measurement systems

External probes for FH 40 G Survey Meter

A rich choice of external probes can be connected to FH 40 G with cable. Readings from both the internal and external detectors are measured simultaneously!  Examples where this may be very useful include:

• Neutron and gamma measurement
• Alpha/beta contamination and dose rate
• Doserate of remote and local detector
• Local dose rate and 20 m under water

Upon connection of an external probe, the probe parameters are automatically read into the FH 40 G and the correct parameters are set. Separate alarms can be set by the user for both the internal and external detectors. Cable length between the FH-40G and detector may be up to 50 meters.

List of available external detectors for FH 40 G Survey Meter:

Gamma dose, dose rate detectors

• FHZ 632 L 100 nano Sv/h up to 100 milli Sv/h
• FHZ 612 wide range, up to 10 Sv/h
• FHZ 312 under water, high range up to 100 Sv/h
• FHZ 302 under water, medium range up to 1 Sv/h

NaI Scintillation detectors

• FHZ 512 NaI 1"x1" light weight, fits to telescope 
• FHZ 502 E NaI 2"x2" aluminum housing with holder 
• FHZ 502 P NaI 2"x2" rugged plastic housing
• FHZ 503 E NaI 3"x3" similar to FHT 502E , increased sensitivity

Plastic scintillation NBR detectors

• FHZ 672 E aluminum housing with "red - green information" for detection of artificial gamma radiation

Neutron Detectors

• FHT 752: BF₃ detector, neutron dose rate equivalent according to ICRP 60
• FHT 752 E: BF₃ detector, handy and lightweight, fits to telescope
• FHT 752 S: BF₃ detector, small size & light weight
• FHT 752 H: He₃ detector, neutron dose rate equivalent according to ICRP 60
• FHT 752 EH: He₃ detector, handy and lightweight
• FHZ 752 SH: He₃ detector, small size
• BF₃ detectors for excellent suppression of gamma radiation
• He₃ detectors for increased neutron sensitivity 

Contamination Detectors

• FHZ 732 alpha+beta probe 44 mm diameter
• FHZ 742 alpha, beta probe 125 cm²