Scintillation properties of the YVO4:Eu3+ compound in powder form: its application to dosimetry in radiation fields produced by pulsed mega­voltage photon beams

N. MARTINEZ; T. TEICHMANN; P. MOLINA; M. SOMMER; M. SANTIAGO; J. HENNIGER; E. CASELLI

ZEITSCHRIFT FUR MEDIZINISCHE PHYSIK

ELSEVIER GMBH

Año: 2015 vol. 25 p. 368 - 374

0939-3889

The investigation of scintillation properties of europium doped yttrium orthovanadate shows the suitability of this material for fiber-based dose rate measurements. All measurements were carried out with a 6 MV Varian linear accelerator. The temperature dependence of the signal is lower than that of the plastic scintillators reported so far. By measuring the afterglow of probes between Linac-pulses, the signal due to the stem effect can be successfully eliminated. Comparison of depth dose profiles in a water phantom for radiation field dimensions between 1 x 1 cm2 and 10 x 10 cm2 shows that the probes are suitable for small fields having dimensions up to 1 x 1 cm2. The high light yield of probes having dimensions of 1 mm opens up the possibility for their use in spatially confined radiation fields, such as in intensity-modulated radiotherapy (IMRT) and volume- modulated radiation therapy (VMAT).