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Thermal lens spectroscopy dosimetry at high doses using a commercial transparent glass

2019; Elsevier BV; Volume: 124; Linguagem: Inglês

10.1016/j.radmeas.2019.03.013

1879-0925

Adriel S. Almeida, Gerardo B. Rivera, Claudevan A. Sousa, Francisco Eroni Paz dos Santos, Divanízia N. Souza,

Laser Material Processing Techniques

A dual-beam mode-mismatched configuration of the thermal lens spectroscopy technique was applied to characterize commercial transparent glass irradiated with high doses of beta radiation (90Sr+90Y). Thermo-optical properties of the glass were studied after irradiation within an approximate dose range of 1.103–7.103 Gy. The glass family and structural group type as well as its amorphous nature were confirmed by Raman spectroscopy and X-ray diffraction. The spectral absorption in UV–Vis range of the samples revealed changes due to radiation exposure. The parameters of thermal diffusivity and phase difference were investigated as a function of the radiation doses, using a CW diode laser (488 nm and 40.0 mW) for excitation and a HeNe laser (632.8 nm) as a probe beam. The theta phase difference and the steady-state thermal lens signal presented a linear response in the dose range studied. Thermal lens spectroscopy was found to be a relatively good candidate as a dosimetry technique that can be useful for investigation of dosimetry characteristics in new glasses.