Fluke Biomedical 943-25 - Manual (Page 5)

Introduction
General Description
1
1-1
Section 1
Introduction
1.1 General Description
The 943 series beta detectors are designed to be sensitive to a beta radiation source.
Although the 943 series beta detectors are functionally identical, the detectors differ in the material used
for the housing; the material used for the end window, and in the response ratio achieved through the
scintillation disc area variations (refer to Section 1.2, Specifications).
Two end window materials are used for the 943 series beta detectors. The mylar end window is used for
replacement of existing beta detectors with similar windows. The beta detectors with titanium end
windows offer greater durability and ease of decontamination.
The beta detector has preamplifier circuitry located in the interior of the overall protective housing. The
preamplifier provides pulse conditioning and cable driving capabilities to match the input characteristics of
the Victoreen instruments used to monitor detector output. The detector is supplied with an eight (8) foot
coaxial cable that normally terminates in a junction box located within a sampling system.
1.2 Application
The detector can be used with Victoreen ratemeters or Scaler Module 960SF. Ratemeters are used with
beta detectors in small single channel analog monitoring systems while scaler modules and detectors are
primarily used in multiple channel digital monitoring systems.
1.3 Specifications
Detector
Dimensions 9 x 2.5 in (22.9 x 6.4 cm)
Weight 3 lbs (1.4 kg), approximately
Housing Stainless Steel 943-25, 943-25A, 943-25B, 943-25T, 943-25TA, 943-
25TB
Carbon Steel 943-26, 943-26A, 943-26B, 943-26T, 943-26TA, 943-
26TB
Power +2000 VDC @ 500 uA, +15 VDC @ 50 mA, -15 VDC @ 50 mA
Connector MS 3106E 2427B
Operating Temperature 32° to 122°F (0° to 50°C)
Storage Temperature 32° to 104°F (0° to 40°C)
Relative Humidity 0 to 95% non-condensing