Original FWT REM500B neutron measuring instrument

REM500 (including optional source) is small in size, light in weight, and does not require a moderator. It has a real REM response integration and rate mode automatic range.

RAD and REM display that the HPI model REM500 is a small and lightweight neutron detector. It measures neutrons through the combination of a Organizational Equivalent Proportional Counter (TEPC) and a 256 channel multi-channel analyzer, without the need for large heavy moderators. The instrument applies appropriate ICRU/P quality factors to each neutron event to achieve true REM response.

The REM500 has all the conveniences of a microprocessor based instrument, including an alphanumeric display, soft keys, and front panel calibration. Guide users to use various functions through the screen menu, with easy operation. The display screen can automatically cover a complete range of 7 orders of magnitude in both RAD and REM units, with both rate mode and integration mode. The integration mode will also display the integration time in hours/minutes/seconds.

The built-in optional verification source can verify the correctness of device operation and detector calibration. The detector is designed to be sealed and has been in use on site for over 10 years. The aluminum casing is sturdy and comes with a sealing gasket. The battery is replaced through the cover at the end of the casing, and the 6-cell C-type alkaline battery can last up to 100 hours.

The REM500 neutron detector is an ideal instrument for laboratory and field measurements of neutrons.

Technical specifications of the original FWTREM500B neutron measuring instrument:

Mechanical parameters;

Size: 12 inches long x 4.5 inches wide x 4.5 inches high (excluding handle), the handle extends the height to 6.25 inches;

Weight: 5 pounds 2 ounces (including alkaline battery);

External control: 5 button switches (power on/off, mode, alternate, reset, backlight);

Internal control: calibration and reset buttons; Gain, pole zero, high and low level discriminator (LLD) fine adjustment potentiometer;

Detector:

Type: Sealed spherical tissue equivalent proportional counter (Rossi type), inner diameter 21/4 inches;

Wall material: A150 conductive tissue equivalent plastic;

Wall thickness: 0.12 centimeters (144 milligrams per square centimeter); Aluminum shell 0.065 inches;

Filling gas: propane gas;

Optional internal source: approximately 0.3 microcuries Cm244;

Working parameters:

Reading: 2-line x 16 character alphanumeric LCD display screen. Rate mode displays radiation levels, counts, and logarithmic bar charts; Integral mode displays radiation level, time (hours: minutes: seconds), and count;

Range: Automatic range, 0.001 milliradians per hour to 100 milliradians per hour, 0.001 milliradians per hour to 100 milliradians per hour;

Time constants: slow, fast, and infinite (infinite mode calculates rate through special integrated dose and time);

Integral range: automatic range, 0.001 milliREM to 999REM, 0.001 milliRAD to 999RAD (integral mode is available when displaying rate range);

Effective range: The effective statistical range of the rate range is 1 milliREM/hour to 100 REM/hour, and 1 milliRAD/hour to 10 RAD/hour (depending on the average quality factor QF of radiation);

Preheating time: 15 seconds;

Battery life: 100 hours (6 alkaline C-type batteries), display screen with low battery indicator.

The response parameters of the original FWTREM500B neutron measuring instrument.

Sensitivity: Approximately 480 counts/milliREM, approximately 4800 counts/milliRAD.

Quality factor derivation: Smooth data from ICRU19QF table and ICRP60 table.

Neutron energy response: 70keV to 20MeV.

Gamma response: less than 1% at 1RAD/hour.

environmental parameters

Impact resistance: The instrument will trigger a response when impacted.

Temperature dependence: Deviation within the range of 15 to 45 ° C is less than ± 15%.

Humidity response: Less than 10% change in relative humidity (non condensing) from 0 to 95%.

Optional internal source: Optional internal Cm244 source requires a radioactive material license.