|
Readout Programmable features of a standard Model 190 Survey
Meter.
Alarm Audio and visual setpoint can be programmed into the Model
190N via the Model 190-1A Infrared Communicator
Logging of data The 190-1A Infrared Communicator interfaced to a
personal computer can be used to set up data logging
Detector Assembly The detector assembly is a
polyethylene cylinder, 9.5 inches long by 8.5 inches in diameter,
containing a BF3 proportional counter and neutron energy
compensating materials. It 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.
BF3 Operating Characteristics The BF3 proportional counter operates
at 1150 V. Active length is 2 inches (5.08 cm). Fill gas is enriched
BF3, 96% Boron 10. Gas pressure is 20 cm Hg. Resolving time is 1
microsecond, plateau slope is 2% per 100 V and tube life expectancy
is greater than 1010 counts
Typical Neutron Sensitivity Nominal 2000 counts per mRem
Range Rate: 0 μRem/h to 75 Rem/h,
0 μSv/R to 0.75 Sv/h,
0 CPM to 2.5 x 106 CPM,
0 CPS to 41,660 CPS. Integrate 0 μRem to 1000 Rem,
0 μSv to 10 Sv,
0 to 109 counts
|
|
Gamma Sensitivity/Rejection No response in 137Cs gamma radiation
in fields up to 500 R/
Accuracy 10% of theoretical ICRP dose rate
Dimensions 12.50 Ø x 10.25 in (d) (31.75 x 26 cm)
Flexibility The Model 190 is detachable from the detector assembly
for remote readings. The Model 190 can be held or can be mounted
on either side of the cylinder for convenient carrying
Miscellaneous Detector assembly cable length: 4.5 ft (1.37 m). An
optional 30 ft (9.14 m) cable is available
Weight 21 lb (9.52 kg) (total Model 190 + detector assembly)
Directionality Less than 20% in three orthogonal directions
Temperature Range The Model 190’s operating range is 14º to 104ºF
(- 10° to + 40°C). The detector assembly operating range is - 112º to
176ºF (- 80° to + 80°C)
Power Requirements Four 9 V alkaline batteries supplied, 100 hours
operation
Calibration The Model 190N is calibrated against a NIST traceable “Tissue Equivalent Proportional Counter” and uses Radium/
Beryllium neutrons at a distance of 100 cm
|
