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965 Stack Continuous Air Radiation Monitor

Continuous Air Radiation Monitor

965 Stack Monitor

The 965 Stack Monitor is a single-channel radiation monitoring system which operates over the range of 10 to 107 CPM. The system monitors gamma radiation and provides indication when the radiation level decreases below a fail threshold, exceeds a warn setpoint, exceeds a high set pointor exceeds an overrange setpoint.

The overrange feature provides two significant benefits. First, it prevents the system from displaying an on-scale but inaccurate reading should the detector become saturated. Second, it lessens the risk of damaging the detector by disabling it during an overrange condition.


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Key Features

  • Count Range: 107 CPM
  • Energy response: 15% from 70 keV to 3 MeV
  • No external power needed at detector location
  • Preamplifier integral with detector
  • Ratemeter may be remotely located up to 1500 feet
  • Single cable between ratemeter and detector
  • 8 µCi 36Cl check source
  • Replaces high maintenance off-line monitoring system
  • Deadtime correction < 1% at 107
  • CPM User adjustable alarm setpoints
  • Seismically tested with high reliability Stack flow monitoring and release calculation
  • Specifications, Gamma Detector


Relay outputs are available to activate alarm annunciators. Analog outputs are available for trend display on a strip chart recorder or computer. Also, the monitoring system has an integral check source to verify operational integrity. The system consists of a 943-36CS Gamma Scintillation Detector and a 942A Universal Digital Ratemeter (UDR). The 965 Stack Monitoring system can be used in any size or shaped stack. Since the detector mounts directly in the stack,there is no need for an expensive, high-maintenance off-line monitoring system. This monitor can be used as a single channel stand-alone, or grouped together in a multi-channel monitoring system.

  • Gamma Scintillation Detector with built-in radioactive check source
  • Monitors radioactivity in exhaust stacks or ducts, and in positron emission tomography (PET) applications
  • Airborne 15O monitor
  • For use with Model 942A UDR or Model 960 electronics
  • Stack/duct flow monitoring capability


The 965 Stack Monitoring system is designed to be used in any size or shaped stack. Since the detectors are mounted directly in the stack, there is no need for an expensive or high maintenance off-line monitoring system. This monitor can be used as a single channel, stand-alone, or grouped together as a multi-channel monitoring system. The standard UDR is factory-modified to include three option boards to allow for computer communications, an analyzer to count 15O (or other selected isotopes) only, and flow compensation to measure stack effluent releases.


Specifications, Gamma Detector

The Model 943-36CS Gamma Scintillation Detector consists of a scintillation crystal, a photomultiplier tube, a preamplifier assembly and an integral check source. The Model 943-36CS detector is designed to be sensitive to gamma radiation. The scintillation material, photomultiplier tube and preamplifier are contained within a cylindrical housing. The preamplifier provides pulse conditioning and cable driving capabilities to match the input characteristics of the instruments used to monitor the detector output. The Model 943-36CS Gamma Scintillation Detector can be used with Universal Digital Ratemeters or with the 960 Digital Radiation Monitoring System (DRMS). Ratemeters are used in systems where individual control room readouts are employed, while the 960 DRMS is used when a complete digital process control system is supplied.


Specifications, Universal Digital Ratemeter

The Model 942A UDR, when connected to a Model 943 Series Scintillation Detector, comprises a monitoring system which operates over a seven decade range. The UDR provides display, control, and annunciation functions for the monitoring system, and will display readings in the range of 10 to 107 CPM. Standard features for the instrument consist of a five digit display of the radiation value and a multicolored bargraph indicator which covers the entire range of the UDR. The bargraph will change color in the event of an alarm condition (green for normal, amber for warning and red for high). Front panel alarm indicators and rear panel relay outputs for alarm annunciation are also included. Front panel pushbuttons are provided to apply power, display alarm limit set points, acknowledge alarms, and activate the check source. Analog outputs of 0 to 10 VDC (1) and 4 to 20 mA (2) are provided for recording and computer monitoring. The outputs may also be used to drive a remote meter or a local (i.e. near the detector) indicator. All electronics required to interface with a Model 943 Series detector are included within the Model 942A UDR. The electronics consist of a high voltage power supply, low voltage DC power supply and the hardware/software required for UDR operation. The system also includes an overrange indicator to preclude the possibility of on-scale readings when the radiation field is beyond the range of the detector.


Model Name


965 Stack Monitor
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