Measurements and Monte Carlo simulations of the fluence and dose characteristics of microplanar photon beams.
The lateral absorbed dose, depth dose and photon fluence in a water phantom of a single microplanar beam is investigated using the Monte Carlo method. To validate the calculated axial and scattered photon fluence, an experiment is carried out using a NaI(TI) detector and 20 mCi Cd-109 source at energies of 22 keV and 88 keV. A 150 microns collimator is used to produce the microplanar beam, and the integrated scattered photon fluence is measured over 2.5 microns increments. The axial (depth) photon fluence is in good agreement with the calculated results. The scattered (lateral) photon fluence results agree to within two standard deviations.
Company
F Z
FZ
Department of Physics, University of Western Sydney Nepean, Kingswood, NSW Australia.
Allen
B J
BJ
D002106:Cadmium Radioisotopes / Q000627:therapeutic use; D015233:Models, Statistical; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011879:Radiotherapy Dosage
D002106:Cadmium Radioisotopes