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

F H Grossi¹, L A S de Melo, P Schor

¹Instituto de Pesquisas Energéticas e Nucleares, Radiation Metrology Center, Av Prof. Lineu Prestes, 2242, São Paulo, SP 05508-000, Brazil. fhgrossi@macbeth.if.usp.br

Radiation Protection Dosimetry

|January 20, 2005

Summary

Phototransferred thermoluminescence (PTTL) using CaSO(4):Dy pellets effectively detected ultraviolet radiation (UVR) spread from ArF excimer lasers during refractive surgery. This method is viable for monitoring patient and staff UVR exposure in operating rooms.

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Area of Science:

Medical Physics
Radiation Detection
Ophthalmology

Background:

Refractive surgery utilizes ArF excimer lasers, emitting ultraviolet radiation (UVR).
Monitoring UVR exposure is crucial for patient and surgical staff safety in operating rooms.

Purpose of the Study:

To evaluate the efficacy of phototransferred thermoluminescence (PTTL) for detecting UVR spread during refractive surgery.
To assess the feasibility of using CaSO(4):Dy pellets for real-time UVR monitoring in surgical environments.

Main Methods:

CaSO(4):Dy pellets were employed as dosimeters to measure UVR levels.
Pellets were strategically placed at varying distances from the laser source within the surgery room.
PTTL measurements were conducted during individual surgeries and over a cumulative 4-hour period.

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Main Results:

UV radiation detection was feasible even at distances up to 4.0 meters from the source.
Absorbed energy measurements ranged from 40 microJ to 30 mJ per surgery.
The PTTL method demonstrated sensitivity to low levels of UVR exposure.

Conclusions:

PTTL using CaSO(4):Dy is a viable method for detecting UVR spread in surgical settings.
This technique can effectively monitor UVR exposure for patients and healthcare professionals during refractive procedures.
The study confirms the utility of PTTL for ensuring safety in laser-based surgical environments.