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

Abstract

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 °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 LiCaAlF 6 :Eu,Y, α-Al 2 O 3 :C, and CaSO 4 :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.