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Specifications
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NEUTRON SURVEY METER, MODEL REM 500

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

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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Specifications subject to change without notice.
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