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Time dependence of energy spectra of brachytherapy sources and its impact on the half and the tenth value layers
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10.1118/1.3246843
/content/aapm/journal/medphys/36/11/10.1118/1.3246843
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/11/10.1118/1.3246843

Figures

Image of FIG. 1.
FIG. 1.

Comparison of the raw energy spectra of model 200 (current) and model 200 (earlier) seeds.

Image of FIG. 2.
FIG. 2.

Impact of spectral time dependence on the value of the first tenth value layer of lead for a model 200 seed made with the earlier manufacturing process (prior to 2005).

Image of FIG. 3.
FIG. 3.

Impact of spectral time dependence on the value of different tenth value layers of lead for a model 200 source made with the earlier manufacturing process.

Image of FIG. 4.
FIG. 4.

Underestimation of the required amount of shielding material (lead) for a model 200 source made with the earlier manufacturing process (prior to 2005), if the time dependence is not taken into account.

Tables

Generic image for table
TABLE I.

Measured spectra of model 200 (earlier) seeds and model 200 (current) seeds.

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TABLE II.

The values of the and of lead for bare , a model 200 (earlier) seed, and model 200 (current) seed at different times from the spectrum measurement date.

Generic image for table
TABLE III.

The values of the TVL of lead for model 200 (earlier) at different times from the spectrum measurement date.

Generic image for table
TABLE IV.

Lead thickness (mm) required to reduce initial exposure rate to a certain level for a model 200 (earlier) seed with time dependence taken into account.

Generic image for table
TABLE V.

Lead thickness (mm) required to reduce initial exposure rate to a certain level for a model 200 (earlier) seed without time dependence taken into account.

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/content/aapm/journal/medphys/36/11/10.1118/1.3246843
2009-10-12
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time dependence of energy spectra of brachytherapy sources and its impact on the half and the tenth value layers
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/11/10.1118/1.3246843
10.1118/1.3246843
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