Fluke Biomedical 956A-201-M2 - Manual (Page 6)

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The Model 956A-201 Series Readout and 897A Series G-M detectors have been successfully subjected
to seismic and environmental qualification testing per IEEE 344-1975 and IEEE-323-1983. In addition,
EMI/RFI testing per the requirements of EPRI TR-102323-R1, MIL-STD-461D, and EN 61000-6-1:2001
has also been successfully performed. Please consult the factory for specific details of the qualification
testing program.
The 956A-201-M2 operation described herein is based on the use of EPROM P/N 94095605, Rev. 1.
Geiger-Mueller Detector, Model 897A-Series
Victoreen 897A-Series G-M detectors use a thin walled Geiger-Mueller tube to detect ionizing radiation.
Each 897A-Series detector has a G-M tube, a check source, and a preamplifier. The check source is a
low-level radioactive source actuated by a + 15 Vdc meter movement. The preamplifier provides the
pulse conditioning and cable driving capability necessary to drive a Victoreen 956A-201 Series digital
ratemeter.
All 897A-Series detectors are functionally identical. They differ only in housing material, tube type, and
range. The 897A Series detectors operate in the voltage range of 500 - 650 Vdc. An example of the
detector plateau, based on different high voltages, is located in Figure 1-1. Refer to the specifications for
all 897A-Series G-M detectors for further information.
The 897A Series G-M detectors contain an eight-microcurie 36 CI
check source. Nuclear Regulatory Commission regulations
define this source as an exempt quantity.
Application
The Model 897A G-M Detector is designed to operate with the Victoreen Model 956A-201 Universal
Digital Ratemeter (UDR) or with other Victoreen readouts. Each detector measures a five-decade range.
Three measurement ranges are available: low, medium, and high. The low range covers 0.01 to 10
3
mR/h, the medium covers 0.1 to 10 4 mR/h, and the high covers 1 to 10 5 mR/h. The Model 897A detector
may also be used with the Victoreen Model 960 Digital Radiation Monitoring System equipment or the
Victoreen Model 856 Analog Readout.
NOTE