Development of wavelength-resolved 3D-inegrated TL and OSL reader system

A new wavelength-resolved thermo luminescence (TL) cum optically stimulated luminescence (OSL) reader system has been designed and developed. This reader system uses the compact Seya-Namioka optical layout based monochromator, PMT, and resistive heating method to acquire TL glow curve emissions spectrum. The phosphor samples heated from room temperature to 400 degrees C, either linearly with a programmable heating rate of 0.01 to 30 K s(-1) or alternative constant step temperature profiles. The TL glow curve emission spectrum has been resolved by rotating the grating attached to a monochromator covering the wavelength from 200 to 900 nm. The wavelength scanning is linear with respect to time and the scan rate can be selected from 0.1 to 8 n m s(-1). A broad spectral response of the PMT detection module has been used to record the emitted TL spectrum. The blue (465 nm) reference LED light source is provided for a spectrum calibration of the monochromator. The isometric 3D TL emission spectra of LiCaAlF6:Eu,Y, alpha-Al2O3:C, and CaSO4:Dy have been successfully recorded using this reader system. In order to record the OSL emission spectrum, 470 nm blue LEDs have been provided as a separate stimulation module.