X-ray area dosimeter Gamma Twin

Gamma ray

Overview
The Gamma Twin is a PTB-approved dose rate meter for the measurement of gamma radiation and X‑rays for ambient dose rate equivalent p*(10) and ambient dose equivalent H*(10) (local dose). It features an energy compensated Geiger‑Müller tube detector in a compact casing with a large backlit LC-display. The instrument is suitable for field monitoring and industrial radiation surveillance.

Main functions and features
The Gamma Twin provides selectable simultaneous or separate indication of dose and dose rate together with an analog dose rate logarithmic bar graph. Four preset dose and dose rate alarm thresholds are available. Alarm thresholds can be configured to customer requirements upon request. The meter offers switchable acoustic single‑pulse indication, automatic and continuous storage of the dose into a non‑volatile memory, and retention of dose and set parameters during battery change. Protection class IP54 (splash proof).

Technical specifications

• Temperature range: -20 °C up to +60 °C
• Power supply: 2 batteries 1.5 V (type AAA)
• Acoustic alarm: 80 dB(A) measured at 30 cm distance
• PTB-Approval No.: 23.51 / 10.02
• Dimensions: 26 x 66 x 103 mm
• Weight: 190 g (incl. batteries)
• Dose rate indication range: 0 nSv/h – 70 mSv/h
• Dose rate measuring range: 0.5 Sv/h – 70 mSv/h
• Dose indication range: 0 nSv – 1.0 Sv
• Dose measuring range: 0.5 Sv – 1.0 Sv
• Energy range: 45 keV – 1.3 MeV
• Dose rate alarm thresholds: 7.5 Sv/h, 25 Sv/h, 40 Sv/h, 300 Sv/h
• Dose alarm thresholds: 200 Sv, 500 Sv, 1000 Sv, 2000 Sv
• Detector: energy compensated Geiger-Müller tube
• Display: large backlit LC-display
• Data storage: automatic and continuous dose storage in non-volatile memory; retains dose and settings during battery change
• Protection class: IP54 (splash proof)