Environmental gamma radiation monitor FD-71A

The predecessor of FD-71A environmental gamma radiation monitoring, FD-71, was mainly used for geological surveys of radioactive deposits in the nuclear industry from the 1960s to the 1980s. --Afterwards, this instrument was widely used for gamma ray detection in enterprises and institutions engaged in radioactive work, such as the environment, building materials, radiation health, inspection, and irradiation

Environmental gamma radiation monitor FD-71AMain features:

1. Lightweight, waterproof, reliable, suitable for outdoor work

2. High sensitivity, header indication, and intuitive degree reading

3. Low power consumption and long battery life

Main technical parameters:

1. Measurement range: I. 0-12.5 nC/kg. h (0-50 micro revolutions per hour)

II. 0-50nC/kg. h (0-200 micro revolutions per hour)

III. 0-250nC/kg. h (0-1000 micro revolutions per hour)

2. Non linearity of each measurement range: ≤ 8%

3. Gamma ray energy threshold: ≤ 35keV

4. Sensitivity threshold of the instrument: not greater than 2 microvolts per hour (0.5nC/kg. h)

5. Time constant: ≤ 5 seconds

6. Long term stability: No standard source calibration is required within ten days, and the relative error of repeated readings is ≤± 10%

7. Power supply: Two No.1 batteries

8. Length and weight: 650mm; 1.6kg