Optical imaging of dose distributions in Fricke gels
Authors: Viti, V.; d'Errico, F.; Pacilio, M.; Luciani, A. M.; Palma, A.; Grande, S.; Ranghiasci, C.; Adorante, N.; Guidoni, L.; Rosi, A.; Ranade, M.; de Pasquale, F.; Barone, P.; Sebastiani, G.
Source: Radiation Protection Dosimetry, Volume 120, Numbers 1-4, September 2006 , pp. 148-150(3)
Publisher: Oxford University Press
Abstract:Ferrous-sulphate infused gels, or ‘Fricke gels’, encounter great interest in the field of radiation dosimetry, due to their potential for 3D radiation dose mapping. Typically, magnetic resonance (MR) relaxation rates are determined in these systems in order to derive the absorbed dose. However, when large concentration gradients are present, diffusion effects before and during the MR imaging may not be negligible. In these cases, optical techniques may represent a viable alternative. This paper describes research aimed at measuring 3D dose distributions in a Fricke-xylenol orange gel by measuring optical density with a CCD camera. This method is inexpensive and fast. A series of early experiments is described, in which optical density profiles were measured with a commercial microdensitometer for film dosimetry. The light box of the device was modified to work at 567 nm, close to the maximum absorbance of the ferric ion-xylenol orange complex. Under these conditions, the gel shows linearity with dose and high sensitivity.
Document Type: Research Article
Publication date: 2006-09-01
- RPD publishes peer-reviewed papers covering all aspects of personal and environmental dosimetry and monitoring for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring and accident dosimetry and dosimetry related to the protection of patients.