title: PTTL method applied to UV radiation detection during refractive surgery using excimer laser.
abstract: 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.
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares, Radiation Metrology Center, Av Prof. Lineu Prestes, 2242, São Paulo, SP 05508-000, Brazil. fhgrossi@macbeth.if.usp.br
authors.forename: F H
authors.initials: FH
authors.lastname: Grossi
authors.forename: L A S
authors.initials: LA
authors.lastname: de Melo
authors.forename: P
authors.initials: P
authors.lastname: Schor
authors.forename: L L
authors.initials: LL
authors.lastname: Campos
mesh_terms: D001822:Body Burden; D001938:Brazil / Q000453:epidemiology; D006801:Humans; D054018:Lasers, Excimer; D016273:Occupational Exposure / Q000032:analysis* / Q000706:statistics & numerical data*; D018903:Photorefractive Keratectomy / Q000706:statistics & numerical data*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000379:methods*; D012030:Refractive Errors / Q000453:epidemiology; D054140:Refractive Surgical Procedures; D012062:Relative Biological Effectiveness; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation / Q000379:methods*; D014466:Ultraviolet Rays