INVESTIGADORES
VALENTE Mauro Andres
congresos y reuniones científicas
Título:
In-phantom dosimetry for BNCT with Fricke and normoxic-polymer gels
Autor/es:
S. GAY M. CARRARA V. COLLI G. GAMBARINI M. MARIANI L. PIROLA G. ROSI M. VALENTE, E. VANOSSI
Lugar:
Pavia, Italia
Reunión:
Congreso; 19th. EPS Nuclear Physics Division Conference ? New Trends in Nuclear Physics and Applications; 2005
Resumen:
Abstract. Measurements of in-phantom dose distributions and images are important for Boron Neutron Capture
Therapy treatment planning. The method for spatial determination of absorbed doses in thermal or epithermal
neutron fields, based on Fricke-xylenol-orange-infused gel dosimeters in form of layers, has revealed to be very
reliable, as gel layer dosimeters give the possibility of obtaining spatial dose distributions and measurements of
each dose contribution in neutron fields, by means of a properly studied procedure. Quite recently, BNCT has
been applied to treat liver metastases; in this work the results of in-phantom dosimetry for explanted liver in
BNCT treatments are described .
Moreover, polyacrylamide gel (PAG) dosimeters in which a polymerization process appears as a consequence of
absorbed dose, have been recently tested, because of their characteristic absence of diffusion. In fact, due to the
diffusion of ferric ions, Fricke-gel dosimeters require prompt analysis after exposure to avoid spatial information
loss. In this work the preliminary results of a study about the reliability of polymer gel in BNCT dosimetry are
also discussed. Gel layers have been irradiated in a phantom exposed in the thermal column of the TRIGA
MARK II reactor (Pavia). The results obtained with the two kinds of gel dosimeter have been compared.. Measurements of in-phantom dose distributions and images are important for Boron Neutron Capture
Therapy treatment planning. The method for spatial determination of absorbed doses in thermal or epithermal
neutron fields, based on Fricke-xylenol-orange-infused gel dosimeters in form of layers, has revealed to be very
reliable, as gel layer dosimeters give the possibility of obtaining spatial dose distributions and measurements of
each dose contribution in neutron fields, by means of a properly studied procedure. Quite recently, BNCT has
been applied to treat liver metastases; in this work the results of in-phantom dosimetry for explanted liver in
BNCT treatments are described .
Moreover, polyacrylamide gel (PAG) dosimeters in which a polymerization process appears as a consequence of
absorbed dose, have been recently tested, because of their characteristic absence of diffusion. In fact, due to the
diffusion of ferric ions, Fricke-gel dosimeters require prompt analysis after exposure to avoid spatial information
loss. In this work the preliminary results of a study about the reliability of polymer gel in BNCT dosimetry are
also discussed. Gel layers have been irradiated in a phantom exposed in the thermal column of the TRIGA
MARK II reactor (Pavia). The results obtained with the two kinds of gel dosimeter have been compared.