GSM-501R Micro-Rem Survey Meter
With internal tissue-equivalent scintillation detector

The GSM-501R Micro Rem survey meter is ideal for measuring low levels of gamma and X-ray in the 0-5000 Micro Rem range. Higher energy betas are also detectable. The tissue-equivalent, internal plastic scintillation detector yields a nearly flat energy response. Only a pressurized ion chamber will provide a more accurate dose measurement and linear response than this survey meter. The GSM-501R Micro-Rem Survey Meter is recommended for nuclear power plant, health physics, and medical applications, whenever true dose is required.

Specifications:

Input Sensitivity: 0.050v-p-p
External CPM / Dose Switch: External switch selects CPM mode or dose-linearized mode in micro Rem.
Ranges: 0 - 5, 0 - 50, 0- 500 & 0 -5,000 Micro REM
Calibration Controls: Each range has separate non-interacting controls.
Diagnostics:  HV out of range, Battery low, Probe over range
Range Adjustment: Auto-ranging LED Range Indicators in Meter Face
Electrical Linearity: ± 5% of full scale
Response time: Optimized each range
Drift: < 5%
Environmental: -20°F (-28° C) - 140°F (60° C)- 5 - 95% RH
High Voltage: Adustable - 300 - 1500 VDC,  Regulation ± 1%
Low Voltage: ±5 vdc,  Regulation ±0.5%
Battery:  6- "AA" Alkaline,  400 HRS Nominal
Audio: ON/OFF Panel Switch
Meter: 3.5” Scale ruggedized meter—W/LED Range Indicators in
Meter Face —Linearity ±3%
Circuitry: 100% Digital Microprocessor controlled, with analog meter face
Dimensions: 5¼” (14cm) H X 4” (10cm) W X 7” (18cm) L
Weight: 2.5 lbs (1.2 kilos)
Probe: Internal 1 in  X 1 in,  plastic tissue equivalent scintillation probe
Probe Operation Voltage: 900 VDC
Probe Energy Response: 40 keV—2MeV Gamma ±10% (based on Cs137)