Studies of UV Induced Phototransferred Thermoluminescence in CaSO4:Dy Pellets

Grossi, F. H.; Campos, L.L.

doi:10.1093/oxfordjournals.rpd.a005904

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…PTTL is the thermoluminescence due to the light incident on a material that was exposed earlier to ionising radiation and partially annealed, leaving some residual charge carriers trapped in the deep traps which are localised in the band gap due to impurities and lattice defects (3) . The CaSO 4 :Dy pellets showed high sensitivity and reproducibility, linear response and good signal resolution for a wide range of absorbed energy (0.01-40 mJ) and gamma doses (5-100 Gy) (4,5) .…”

Section: Introductionmentioning

confidence: 99%

PTTL method applied to UV radiation detection during refractive surgery using excimer laser

Grossi¹,

Melo²,

Schor³

et al. 2005

Radiation Protection Dosimetry

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The method of phototransferred thermoluminescence (PTTL), using CaSO(4):Dy pellets produced at IPEN as sensitive material, was used to detect the spread laser radiation inside the surgery room during refractive surgical procedures using ArF excimer lasers. The purpose of this work was to study the viability of performing the ultraviolet radiation (UVR) exposure detection of patients and the hospital's surgical staff during a refractive surgery. The CaSO(4):Dy pellets were positioned at different distances from the laser source inside the surgery room: patient's ( congruent with 0.15 m), surgeon's ( congruent with 0.5 m) and nurse's ( congruent with 1.0 m) foreheads, lateral ( congruent with 1.5 m) and back ( congruent with 4.0 m) walls. The measurements of PTTL were carried out at two different conditions: five surgeries, each one taking approximately 10 min, and during a period of 4 h (cumulative), when several operations were performed. The detectors positioned as far as 4.0 m from the UV laser source were sensitised, making the UVR detection feasible at large source-detector distances. The absorbed energy was detected in the range from 40 microJ to 30 mJ during a surgery. This result indicates that the method studied can be used to detect the spread UVR.

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Section: Introductionmentioning

confidence: 99%