OSL films for in-vivo entrance dose measurements

Measuring entrance exposures to diagnostic or therapeutic radiology patients is valuable to infer dose distributions within their bodies in order to minimize unnecessary exposures. For this purpose, we investigated the development of dosimeters consisting of waterproof, transparent, and flexible fil...

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Bibliographic Details
Published in:	Radiation measurements Vol. 106; pp. 644 - 649
Main Authors:	Souza, S.O., d'Errico, F., Azimi, B., Baldassare, A., Alves, A.V.S., Valença, J.V.B., Barros, V.S.M., Cascone, M.G., Lazzeri, L.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-11-2017
Subjects:	Entrance dose In-vivo dosimetry OSL film OSL film Entrance dose In-vivo dosimetry
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Summary:	Measuring entrance exposures to diagnostic or therapeutic radiology patients is valuable to infer dose distributions within their bodies in order to minimize unnecessary exposures. For this purpose, we investigated the development of dosimeters consisting of waterproof, transparent, and flexible films containing OSL microcrystals. In our method, films are produced by casting solutions, followed by solvent evaporation. Non-aggressive chemicals are used, which allows the production of films containing large quantities of crystals without altering their structure. In this proof of principle study, we chose polyvinyl chloride (PVC) as a polymer matrix due to its high transparency and its waterproof nature and we produced films loaded with microcrystals of CaF2:Ce. A mixture of acetone:benzene (40:60 wt%) was selected as the best solvent for producing PVC films loaded with CaF2:Ce crystals. This solvent offers ease of handling, low toxicity, low cost, and does not affect the crystal structure nor its OSL emission. The PVC films can be loaded with any luminescent material. For proof of concept we chose to load them with CaF2:Ce micron sized particles because they emit an intense OSL signal for a low beta dose of 100 mGy, showing very good sensitivity for dosimetric applications. Our results indicate that films loaded with OSL crystals may be suitable for the production of a novel OSL dosimeter, which adheres closely to the body and could be used during a radiological procedure to estimate the entrance dose. As OSL materials are sensitive to light, somehow the films would have to be shielded from light for dosimetric purposes. •PVC films loaded with OSL crystals may be suitable for the production of novel 2D-OSL dosimeter.•Waterproof, transparent, and flexible films containing OSL microcrystals were developed.•Dosimetric films are produced by casting solutions, followed by solvent evaporation.
ISSN:	1350-4487 1879-0925
DOI:	10.1016/j.radmeas.2017.07.006