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190N Portable Neutron Survey Meter

 190N
The self-contained 190N measures mRem in accordance with the classical Anderson and Braun design. The neutron probe can be attached to either a 190 Survey Meter or a 190F Frisker for continuous neutron surveys or area monitoring.

Neutron Probe, RP-N, can be interfaced to the 190F Frisker, with ac power for continuous monitoring.

Key Features
  • Auto-scaling measurement of rate and dose (integrate mode includes dose and time accumulation)
  • True Rem readings recorded across a wider (lower and higher) rate range
  • Ergonomic, portable design: adjustable shoulder strap and rugged handle with padded grip
  • Flexible detector assembly, 190 can be removed for remote readings
  • Available in SI units
Product Specifications
Readout
Programmable features of a standard Model 190 Survey Meter. Refer to the Model 190 data sheet for complete details
Alarm
Audio and visual setpoint can be programmed into the Model 190N via the Model 190-1A Infrared Communicator
Detector assembly, Model RP-N
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/h
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
Model NameDescription
190NPortable Neutron Survey Meter
190N-SIPortable Neutron Survey Meter, SI Unit

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