The work horse (OSL Reader)
The Landauer OSLR 5O reader utilizes a High-Powered Light Emitting Diode (LED) AND Pulsed Optically Stimulated Luminescence (P-OSL) technology to achieve better separation between the optical stimulation spectra (green region):

Uses LED (Light Emitting Diode) to stimulate the detectors
Light emitted is measured by a photomultiplier tube (PMT) using a high sensitivity photon counting system.
Amount of light released during optical stimulation is directly proportional to the radiation dose.
A dose equivalent estimation algorithm is applied to the measurement.