If you are a real estate inspector, you are probably equipped with or concerned by the use of a device for detecting lead in paint in order to carry out your lead exposure risk assessments (CREP). But do you really know the technology behind your machine? This article provides an example with the FEnX, a latest-generation lead detector for paint designed and distributed in France by Fondis Electronic, a subsidiary of the Physitek group.
Lead detectors for paint contain a radioactive source
A portable lead detector works using X-ray fluorescence and contains a radioactive source: an isotope of Cadmium 109, which is sealed. When a measurement is taken, the radiation from this source is absorbed by the chemical elements contained in the paint being analyzed. This radiation then causes the emission of a fluorescence spectrum in the form of lines characteristic of each element in the periodic table.
A source sealed in accordance with regulations
The use and possession of radioactive sources are covered by a legal framework aimed at preserving safety, health, public health, and environmental protection. Devices for detecting lead in paint are therefore subject to these regulations. The isotope contained in the FEnX is sealed in a tungsten container, a heavy alloy that limits radiation. In addition, it is equipped with a double safety feature (indicator diodes when the shutter is opened, pressing the measuring head to trigger an analysis). These mechanisms make it a safe device for the operator. As a reminder, minimal training is required to use a lead detection device in paint.
The lifespan of the source
The lifespan of a radioactive source corresponds to the time required for the radioactive nuclei to decay. This period is directly related to the radionuclide and does not depend on the environment. Radioactive activity is expressed in MBq (megabecquerels). It corresponds to the number of nuclear decays per second on a given date (source date). This means that day after day, the radioactive activity of the element decreases.
In the FEnX lead analyzer, the Cadmium 109 source can be 370 MBq (i.e., 3 years) or 850 MBq (i.e., 5 years). Beyond this period, the aging of the source reduces the speed and accuracy of measurements. This is why it is essential to replace the source.
Replacing the source
Warning: Diagnostic technicians who do not follow the manufacturer’s recommendations for replacing the source risk providing inaccurate analysis reports and are therefore liable.
Only the manufacturer is authorized to replace the source. At Fondis Electronic, we have authorization from the ASN (French Nuclear Safety Authority) to provide after-sales service for the devices. Our dedicated technical team can quickly replace the source and assist you with the administrative procedures (ASN declaration, IRSN supply request). To replace the source in your lead analyzer:
- Contact the sales department;
- Submit a supply request to the IRSN (red document) to obtain the IRSN Visa;
- Once you have obtained your IRSN Visa, our teams can proceed with the replacement of the source.
