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Measurement of dose–width product in panoramic dental radiology

Department of Health Physics, Azienda Ospedaliera San Giovanni Battista di Torino, c.so Bramante 88, 10126 Torino, Italy

The National Radiological Protection Board has recommended the introduction of dose–width product (DWP) for the measurement of patient dose in panoramic dental radiology. The present work describes a method for measuring DWP using a pencil ionization chamber. The technique was tested on five panoramic dental units; the reproducibility of the method was 5.7%. In order to test the method, DWP was also assessed using thermoluminescent dosemeters and film. The results obtained agreed within 8.6% with those obtained using the pencil ionization chamber method. The proposed method appears to be simple and precise.

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