QRV Systems | TERRA

Purpose of use

Features

Five independent measuring channels with alternate indication of data on the single liquid crystal display.
Built-in gamma, beta sensitive Geiger-Muller counter.
Prompt evaluation of gamma background within 10 seconds.
Automatic subtraction of gamma background at measurement of beta contamination.
Measurement results averaging, manually and automatically interrupted.
Automatic setting of measurement intervals and ranges.
Audio signalling of each detected gamma-quantum and beta-particle with possible switching off.
Two-tone audio alarm of exceeded programmed threshold levels.
Digital display backlight.
Two AAA size batteries.
Low battery indication.
Shock resistant frame.
Small weight and dimension parameters.

Delivery kit

Specifications

Measurement ranges and main relative errors:
Gamma and X-ray radiation ambient dose equivalent rate (137Cs)
0.1…9 999 µSv/h
Main relative error %
±(15+2/H*(10)), where H*(10) is a numeric value of measured DER equivalent to µSv/h
Gamma and X-ray radiation ambient dose equivalent (137Cs)
0.001…9 999 mSv ±15%
Beta-particles flux density (90Sr+90Y) 1/(cm²×min) 10…100 000;
% ±(20+200/φβ), where φβ is a numeric value of measured beta-particles flux density equivalent to part./(cm²×min)
Ambient dose equivalent accumulation time and accuracy of measurement
1 min…9 999 h; ±0.1 s per 24 h

Energy ranges of measurement and energy dependence:

Gamma and X-ray radiation
0.05…3.0; ±25% MeV
Beta radiation
0.5…3.0 MeV
Resolution of threshold level programming for:
– dose rate 0.01 µSv/h
– dose 0.001 mSv
– flux density 10³/(cm²×min) 0.01

Battery life* 1 500 hours

Operating temperature range -20…+50 °С

Weight 0.2 kg

Dimensions 120×52×26 mm

TERRA