Fluke Biomedical 190N - Manual (Page 5)

Introduction
Product Description
1
1-1
Section 1
Introduction
1.1 Product Description
The Model 190N is a portable neutron survey meter in the classical Anderson and Braun design
(Snoopy). This survey meter provides mRem rate and dose measurements by combining a moderator /
attenuator probe with all of the features of the Model 190, a “smart” digital survey instrument.
The 190N is lighter in weight than previous designs and ergonomically designed to be easier to carry and
use.
The probe can also be attached to a Model 190AC or the Model 190F Frisker. Both of which can be AC
powered, for continual area monitoring. The Frisker version also includes a metal stand for the 190F.
1.2 Specifications
General The Model 190N is comprised of a neutron moderator / attenuator
containing a BF
3
proportional counter and a Model 190. A handle and a
carrying strap are attached to the moderator. The Model 190 serves as
the readout. It is attached to the moderator as well and can be placed
on either side of the handle. It is also completely removable. A special
probe adapter in the Model 190 is cabled to a preamplifier in a housing
on the moderator which is coupled directly to the BF
3
tube inside.
Readout The Model 190N uses the standard Model 190 as the readout. See the
Model 190 manual for a full description of the audio and visual display
features
Alarm Audio and visual alarms can be programmed into the Model 190N via
the Model 190-1A Infared Communicator
Logging of Data The 190-1A communicator interfaced to a personal computer can be
used to set up data logging
Detector Assembly, Model RP-N The detector assembly is a polyethylene cylinder 9.5 inches long by
8.5 inches in diameter (24.1 x 21.6 cm) containing a BF
3
proportional
counter and neutron energy compensating materials. This
arrangement is based upon the standard reliable Anderson and Braun
design for neutron energy response. The handle is padded for ease of
gripping. An adjustable shoulder strap is provided
BF
3
Operating Characteristics The BF
3
proportional counter nominally operates at 1150 V
Active Length: 2 inches ( 5.08 cm)
Fill Gas: Enriched BF
3
, 96% Boron 10
Gas Pressure: 20 cm Hg.
Resolving Time: 1 microsecond
Plateau Slope: 2% per 100 V
Tube Life Expectancy: Greater than 10 10 counts
Neutron Energy Response The energy range is thermal ( 0.025 eV ) to 15 MeV.