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Radiation Protection Dosimetry Advance Access published online on January 18, 2005
Radiation Protection Dosimetry, doi:10.1093/rpd/nch443
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Radiation Protection Dosimetry © Oxford University Press 2005; all rights reserved
Received August 17, 2004
Revised November 10, 2004
Accepted December 5, 2004

TECHNICAL NOTE

PTTL METHOD APPLIED TO UV RADIATION DETECTION DURING REFRACTIVE SURGERY USING EXCIMER LASER

F. H. Grossi 1*, L. A. S. de Melo Jr2, P. Schor 2, and L. L. Campos 1

1 Instituto de Pesquisas Energéticas e Nucleares, Radiation Metrology Center, Av Prof. Lineu Prestes, 2242, São Paulo, SP 05508-000, Brazil
2 Universidade Federal do Estado de São Paulo, Bioengineering Department, R Napoleão de Barros, 715, São Paulo, SP 04024-000, Brazil

* To whom correspondence should be addressed.
F. H. Grossi, E-mail: fhgrossi{at}macbeth.if.usp.br


  Abstract

The method of phototransferred thermoluminescence (PTTL), using CaSO4: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 CaSO4:Dy pellets were positioned at different distances from the laser source inside the surgery room: patient's ({cong}0.15 m), surgeon's ({cong}0.5 m) and nurse's ({cong}1.0 m) foreheads, lateral ({cong}1.5 m) and back ({cong}4.0 m) walls. The measurements of PTTL were carried out at two different conditions: five surgeries, each one taking ~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 µJ 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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