3 detector types – Fluke Biomedical 1060AM User Manual
Page 9
Introduction
Specifications
1
1-5
• Provide digital input and analog inputs signals, such as for pressure and
flow
10.
Responds to data entry switches.
11.
Updates indicators, and digital and analog outputs, and responds to
serial communications within 250 mSec.
12.
Task and prioritize Interrupts
1.3 Detector Types
The radiation detected and energy response are a function of the radiation detectors selected. The four
most common types are Geiger Mueller tubes used to detect: x-rays, gamma rays, and beta rays;
Proportional tubes used to detect alpha particles, and beta rays, BF
3
tubes to detect neutrons, and
photomultiplier tubes/scintillators used to detect x-rays and gamma rays.
The standard detectors are listed as follows:
1.3.1 Geiger Mueller Tubes
Model 1B85 Geiger Mueller tubes are routinely supplied for environmental monitoring. These tubes are
rugged, relatively large in size, very sensitive to radiation, and are thin walled for enhanced low energy
sensitivity.
P/N Range
Name
Range in mR/hr CPS/mR/hr
380-49
Low
.002 – 200
36.67
90-12 Low
BKGND
-
10
3
20
IE qualified Geiger Mueller tubes have demonstrated their reliability in use in various Nuclear Facilities.
The tubes supplied are summarized as follows:
P/N Range
Name
Range in mR/hr CPS/mR/hr
857-210-20
Low
0.01 - 10
3
8.0
857-220-20 Medium
0.1-
10
4
1.2
857-230-20 High
1.0-
10
5
0.53
Many other custom Geiger Mueller tubes are available, upon special request.
14
C Beta
0.158
59
5.3
l33
Ba Gamma
0.356
72
6.5
129
I Beta/Gamma 0.029
49
4.4
1.3.2 BF
3
Tubes
These tubes are used to detect neutrons, but must be configured into a detector assembly with the
appropriate moderator and attenuator. The part number for this detector assembly is RP-N. In the neutron
detector, the moderator/attenuator assembly is a polyethylene cylinder 9.5 in x 8.5 in diameter containing
a BF
3
proportional counter and neutron energy compensating materials. This arrangement is based upon
the standard reliable Snoopy designs for neutron energy response.
The operating characteristics of the BF
3
tube are as follows:
The BF
3
proportional counter operates at 1150 V.
Active length:
2 in (5.08 cm)
Gas pressure:
20 cm Hg
Fill Gas:
enriched BF
3
, 96% Boron 10