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Dosimetric characterization of Ir-192 LDR elongated sources
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10.1118/1.2839102
/content/aapm/journal/medphys/35/3/10.1118/1.2839102
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/3/10.1118/1.2839102

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of the hairpin of total length. All dimensions are in cm. The coordinate system is also shown.

Image of FIG. 2.
FIG. 2.

A comparison between the MC simulated and theoretically calculated isodose lines for the Ir-192 wire. Isodose curves obtained with the MC simulation (black lines) are compared with: (Upper left side, red line) those obtained superimposing wires; (upper right side, red line) those obtained superimposing wires; (lower left side, red line) those applying the PSS model; (lower right, red line) and those obtained applying the TLS model. Different color coded shades in the background of the figure represent the ratio of the dose obtained directly from the MC simulation and that obtained using the superposition principle with each one of the four models.

Image of FIG. 3.
FIG. 3.

Isodose curves for the Ir-192 wire obtained with the MC simulation (black lines) are compared with those obtained applying the Karaiskos’ method. Different color coded shades in the background of the figure represent the ratio of the dose obtained directly from the MC simulation and that obtained using the Karaiskos’ method.

Image of FIG. 4.
FIG. 4.

A comparison between the MC simulated and theoretically calculated isodose lines in the yz plane, for the U-shaped wire. The plane shown is . Isodose curves obtained with the MC simulation of the hairpin (black line) are compared with those obtained applying the TLS model (left side, red line) and those applying the PSS model (right side, red line). Different color coded shades in the background of the figure represents the ratio between the dose obtained directly from the MC simulation and that obtained using the superposition principle.

Tables

Generic image for table
TABLE I.

Radial dose function for the 0.5 and straight wires. (Note: The radical dose function of wires has been fitted to a fifth order polynomial between 0.25 and with coefficients: (a) For the length wire , , , , and . (b) For the wire , , , , and ).

Generic image for table
TABLE II.

Anisotropy function for the wire. The origin is taken at the geometrical center of the wire.

Generic image for table
TABLE III.

Anisotropy function for the wire. The origin is taken at the geometrical center of the wire.

Generic image for table
TABLE IV.

Dose rate in water per unit air-kerma strength around the wire. axis is the longitudinal source axis with its origin located at the geometrical center of the wire.

Generic image for table
TABLE V.

Dose rate in water per unit air kerma strength around the wire.

Generic image for table
TABLE VI.

Dose rate in water per unit air-kerma strength around the wire.

Generic image for table
TABLE VII.

Dose rate in water per unit air-kerma strength as a function of the superposition method. Dose points are set transverse to the source axis at from the outer end of a wire on the source axis. The dose rate in point (0, 1.0 cm, 0), i.e., the dose rate constant , is also given. The wire setup is according to Fig. 2. Between brackets is given the percentage error relative to the Monte Carlo (MC) dose rate in the same point, obtained from Table IV. LSS-a uses the linear source of Table II, with anisotropy correction. LSS-i is the same as LSS-a but without the anisotropy correction.

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/content/aapm/journal/medphys/35/3/10.1118/1.2839102
2008-02-27
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dosimetric characterization of Ir-192 LDR elongated sources
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/3/10.1118/1.2839102
10.1118/1.2839102
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