track-etch detector

A track-etch detector is a type of passive radiation detector that utilizes the damage caused by charged particles in solid materials. When a charged particle passes through certain dielectric materials, it leaves a damaged track. This damage can be revealed through chemical etching, which erodes the material. The etching rate is higher along the damaged track than on the undamaged surface, creating pits that can be observed under a microscope.1

The number of these pits per unit area is a measure of the particle flux. There's a minimum damage density required for pits to form, which correlates with the particle's energy loss per distance (dE/dx). This means track-etch detectors are sensitive to heavier charged particles and can be insensitive to beta particles and gamma rays, making them useful for specific applications like measuring radon gas.1