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Rem 500 shown
with optional source
SMALL SIZE AND WEIGHT
NO MODERATOR
NEEDED
TRUE REM
RESPONSE
INTEGRATE
AND RATE MODES
AUTORANGES
RAD and
REM DISPLAYS
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The
HPI model REM 500 is a small lightweight Neutron Survey Meter. It
eliminates the need for a large heavy moderator by measuring the
neutrons with a Tissue Equivalent Proportional Counter (TEPC) combined
with a 256 channel multichannel analyzer. The instrument applies
the appropriate ICRU/P quality factors to each neutron event which
results in a true REM response.
The REM 500 has all the convenience of a microprocessor based instrument
including an alphanumeric display, softkeys, and front panel calibration.
It is an easy to use instrument with on screen menus directing the
user to the various functions. The display autoranges through a
full 7 decades on both RADs and REMs. It has both a rate and integrate
mode. The integrate range also displays the integration time in
hrs/min/sec.
A built in optional check source verifies correct operation and
detector calibration. The detector is sealed; this design has been
used in the field for over 10 years.
The aluminum case is rugged and gasketed. Battery access is through
a cover on the end of the case. The Battery life is 100 hours on
6 C cells.
The REM 500 Neutron Survey Meter is the ideal instrument to measure
neutrons both in the lab or in the field.
Specifications
Mechanical
 Size:
12"L x 4.5"W x 4.5"H excluding handle, handle extends
height to 6.25".
Weight: 5
lbs., 2 oz including alkaline batteries.
External
Controls: 5 pushbutton switches for POWER ON/OFF, MODE, ALTERNATE,
RESET and LIGHT.
Internal
Controls: Cal and Reset button; Gain, Pole Zero, High Voltage, and
LLD trimpots.
Detector
Type:
Sealed Spherical Tissue Equivalent Proportional Counter. Rossi Type.
2 1/4" ID.
Wall Material:
A150 Conducting Tissue Equivalent plastic.
Wall Thickness:
0.12 cm, 144 mg/cm; Aluminum can .065"
Filling Gas:
Propane gas
Optional
Internal Source: Approx 0.3 uC Cm244
Operational
Readout:
Alphanumeric 2 line x 16 character LCD. Rate range displays radiation
level, counts and log bargraph. Integrate range displays radiation
level, time in HH:MM:SS, and counts.
Rate Range:
Autoranging from .001 mREM/h to 100 REM/h and .001 mRAD/h to 100
mRAD/h.
Time Constant:
Slow, Fast and Infinite. Infinite is rate calculated from special
integrated dose and time.
Integrate
Range: Autoranging from .001 mREM to 999 REM and .001 mRAD to 999
RAD. Integrate range is operational when displaying rate range.
Useful Range:
For valid statistics on rate range: 1 mREM/h to 100 Rem/h and 1
mRAD/h to 10 RAD/h (Depends on average QF of radiation).
Warm Up Time:
15 seconds
Battery Life:
100 hours; 6 ea alkaline C cells. Low battery indicator in display.
Response
Sensitivity:
~480 counts/mRem, ~4800 counts/mRad.
Quality Factor
Derivation: Smoothed data from ICRU 19 QF table and ICRP 60 table.
Neutron Energy
Response: 70 KeV to 20 MeV.
Gamma Response:
Less than 1% at 1 RAD/h
Environmental
Shock:
Banging on the instrument will make it respond.
Temperature
Dependence: Less than ± 15 % from 15 to 45°C
Humidity
Response: Less than 10 % change from 0 to 95 % RH non condensing.
Optional Internal Source
The
optional Internal Cm244 source requires radioactive materials license.
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