Thermoluminescence dosimetry of liquid 32P sources of variable size and composition

Petelenz, B., Bilski, P., Walichiewicz, P., Gaca, P. and Wilczek, K. (2002) Thermoluminescence dosimetry of liquid 32P sources of variable size and composition. Radiation Measurements, 35 (3), 245-249. (doi:10.1016/S1350-4487(02)00040-9).

Abstract

Dosimetry of liquid sources was studied in terms of their size and composition, to check how self-absorption of balloon-based intravascular brachytherapy sources may influence doses at a target point.

The sources contained aqueous solutions of -phosphate, saline, and iodinated contrast media (0–). Doses were measured in Plexiglas phantoms at radial distance, using miniature flat thermoluminescence detectors.

The absolute dose rates measured for 2.0– diameter range increased from 0.25 to 0.43 and were slightly lower than theoretical values. A diameter balloon delivered 0.33, and a ID Plexiglas tube 0.40 . A titanium stent present on the balloon enhanced the dose rate at distance, whereas an one reduced it. The influence of iodine concentration was not very well pronounced.

The observed increase of absolute dose rates in the clinically essential range of source diameters is an important parameter for radiotherapy planning.

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