What is one of the main advantages of using fluorescent particles in magnetic particle tests?

Using fluorescent particles in magnetic particle testing offers the significant advantage of higher visibility under ultraviolet (UV) light. The fluorescence produced by these particles enhances the contrast of the indications against the background, making it much easier for inspectors to identify and evaluate subsurface and surface flaws in ferromagnetic materials. This increased visibility allows for more effective and efficient defect detection, particularly in low ambient light conditions where traditional visible-dye penetrants may not be as effective.

Fluorescent particles emit a bright glow when exposed to UV light, which not only aids in visibility but also allows inspectors to detect defects that may otherwise be missed due to the subtlety of the indications. This characteristic is particularly valuable in critical applications where integrity is paramount.

In contrast, other options such as lower cost or less magnetic interference do not relate specifically to the advantages of fluorescent particles in this context, nor does the option about the magnetic field address the fundamental aspects of the testing process where magnetic fields are essential for creating the conditions necessary for effective defect detection.