Fluke Biomedical 943-27 Detector - Manual (Page 5)

General Information
General Description
1
1-1
Section 1
General Information
1.1 General Description
The Victoreen
®
Model 943-27 Current Mode Beta Scintillation detector is a radiation detection device that
detects beta radiation. The detector is housed in a 1.5-inch diameter stainless steel tube. The detector is
identified as the Model 943-27 and is manufactured as a P/N 943-27-31 detector assembly. Both
identification numbers are used interchangeably throughout this manual. The detector is designed for
accident range operation.
The detector operates at a potential of approximately (-) 500 VDC and provides a nominal DC output
current of 1 x 10
-12 amperes at 1 x 10 -3 to 1 x 10 -5 uCi/cc. The maximum current output is 1 x 10 -4 amperes.
The detector consists of a 0.002-inch thick Titanium end window, a calcium fluoride scintillation crystal
optically coupled to a quartz light pipe and a photomultiplier tube.
The detector is designed to operate with a Model 943-227-15 Series Digital preamplifier and a Model 960
Digital Process Radiation monitoring system or a Model 942A-200C Series Digital Ratemeter. The Model
943-227-15 Digital Preamplifier is a self-contained electrometer housed in a NEMA 4 enclosure. The
preamplifier processes the DC input signal, digitizes the signal, and then transmits the digitized radiation
value to the readout device via a RC232C compatible serial data communication. For additional
information on the preamplifier and readout device, refer to the applicable product or system level
instruction manual.
Interconnection between the detector and preamplifier is accomplished using two (2) six (6) foot coaxial
cables. One cable supplies the detector high voltage and the other cable provides the signal output
For additional information on the detector preamplifier or readout device, refer to the instruction manual
for the Model 943-227-15 Preamplifier, the Model 942A-200C UDR, or the applicable Model 960 System
manual.
1.2 Application
The Model 943-27-31 Detector is used with the Victoreen 942A-200C or Model 960 Digital Process
Radiation monitor and the Model 943-227-15 Series Digital preamplifier. The Model 942A-200C or 960
system readouts provide the +15 VDC preamplifier electronics power, (-) 500 VDC detector power and
the RS232C serial communications support. The digital preamplifier converts the detector output into a
digital signal for processing by the digital readout. Table 1-1 is a list of available configurations and
compatible 9XX series equipment. Please contact Fluke Biomedical Radiation Management Services for
additional information.
Table 1-1 943-27 Variations and Compatible Equipment
Detector Preamplifier
Variations Application Readout
943-27-31 Beta
Detector,
Current Mode
Operation
943-227-15 Digital
Preamplifier
Transmission
Distances
Less than 50 feet
942A-200C Digital Ratemeter
or Model 960 Digital Process
Control System
943-227-15VL Digital
Preamplifier
Transmission
Distances up to 1
mile
942A-200C Digital Ratemeter
or Model 960 Digital Process
Control System