Measure Specific Activity of 137Cs and 131I Radioactive Isotopes in
Food and Water Radioactive Detector
1 Instrument Overview:
FJ-45WF-2 Water and Food Contamination Radioactive Detector is a
water and food contamination radioactive monitoring instrument
based on a sodium iodide (low potassium) detector. Used to measure
the specific activity of 137Cs and 131I radioactive isotopes in
food and water (including various beverages), it is an ideal
instrument for rapid detection of radioactive contamination levels
in food or water by households, enterprises, shopping malls,
inspection and quarantine, disease control, environmental
protection and other institutions..
The probe of this instrument uses highly sensitive sodium iodide
scintillation crystals with a crystal size of 45mm * 70mm. Fast
operation, accurate measurement, and high sensitivity. This
instrument is lightweight, beautiful, highly reliable, equipped
with a high pixel and environmentally friendly LCD color display
screen. The human-machine interaction is simple and convenient,
making it easy for workers to carry around and perform real-time
target detection. It has been widely applied in relevant
departments of radiation monitoring and protection, providing
reliable technical support and decision-making contributions for
national counter-terrorism and nuclear emergency, nuclear power
plants, customs and exit inspection and quarantine.
2 Main Performance and Technical Parameters
| Detector | 45mm * 70mm NaI detector+Marinelli cup |
| Dose rate range | 0.1-20 μ Sv/h (relative to Cs-137) |
| Adaptive density range | 0.2-1.8g/cm3; Range: 10Bq/L to 105Bq/L (relative to Cs-137, using a
standard sample cup) |
| Measurement accuracy | 3% to 6% |
| Minimum detection activity | 10Bq/L (relative to Cs-137) |
| Measurement speed | The typical time for reading 95% is 5 seconds (activity>100Bq) |
| Display units | Bq/L, Bq/kg |
| Environmental temperature | -20~40℃ |
| Relative humidity | not greater than 95% |
3 Construction and Working Principle:
FJ-45WF-2 Water and Food Nuclear Radiation Detection Analyzer, due
to its lightweight design, integrates detectors, rechargeable
batteries, complex and large electronic components, and liquid
crystal displays inside. The main accessories of the equipment
department include external power adapters, exquisite instrument
packaging boxes, and a set of user manuals.
3.1 Overall assembly structure:
This equipment is powered by batteries during normal operation.
After running out of power, an external adapter can be used to
charge the equipment. The schematic diagram of the final assembly
is shown in the following figure:
3.2 Host Structure:
This instrument has high integration, and as long as its built-in
battery is fully charged, it can complete measurement and analysis
tasks such as dose rate/activity measurement, gamma spectroscopy
measurement, and nuclide analysis. NaI detectors are used for both
low radiation dose measurement and gamma spectrum measurement in
the environment. The main function of electronic components is to
digitize the nuclear pulse signal output by the detector, convert
it into amplitude spectrum data, and use it for upper level
analysis software. The front panel of the instrument mainly has
four buttons: left button, confirm button, right button, and on/off
button; LCD screens are used to display the working status,
measurement data, and other information of instruments. The
aviation interface on the side panel includes USB communication
data interface and external power adapter interface.
3.2.1 Power adapter and power interface:
The lithium battery power charger uses 220V/50Hz AC power to charge
the built-in rechargeable battery of the spectrometer. When
starting up and charging, it is recommended that users remove the
charger when using the spectrometer for energy spectrum
measurement.
3.2.2 Precautions for Power Supply System:
After each startup, the battery level icon should be observed
first. If the battery icon shows an empty state, a power adapter
should be used to power the instrument and charge the built-in
rechargeable battery for 4 to 6 hours. After the built-in
rechargeable battery is fully charged, it can provide the
instrument with normal operation for about 10 hours.
After 2-3 years of operation (under normal circumstances), if the
built-in rechargeable battery cannot be charged or the amount
charged each time is too small, causing the instrument to not
function properly, the rechargeable battery needs to be replaced;
If the system time cannot be set properly or there is an error
time, it is necessary to replace the button battery powered by the
system clock. If you need to replace the built-in battery, please
contact the after-sales service center of the instrument for
assistance. Do not open or replace the battery without
authorization during the warranty period.
