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Energy dependence and dose response of Gafchromic EBT2 film over a wide range of photon, electron, and proton beam energies
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10.1118/1.3373523
/content/aapm/journal/medphys/37/5/10.1118/1.3373523
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/5/10.1118/1.3373523

Figures

Image of FIG. 1.
FIG. 1.

Setup used for irradiation of EBT2 film pieces in air using an orthovoltage unit. The EBT2 films were placed on thin plastic Saran Wrap for irradiation with 75, 125, and 250 kVp photon beams at a source-to-film distance of 50 cm. The employed field size was .

Image of FIG. 2.
FIG. 2.

Setup used for irradiation of EBT2 film pieces in air with a irradiator. The films were sandwiched between 0.12 cm Solid Water buildup slabs and placed on thin plastic Saran Wrap stretched over a Styrofoam stand. Each film piece was placed in a reference geometry (source-film distance of 21.0 cm)

Image of FIG. 3.
FIG. 3.

Dose responses of EBT2 films for a range of beam energies from different radiation sources. The region between the two extreme curves represents the trend of all the data collectively and encompasses more than 95% of the data. The variation in data in this the region between the 3 and 10 Gy doses corresponds to .

Image of FIG. 4.
FIG. 4.

[(a) and (b)] The expanded graph to show low and high dose regions of the Fig. 3. The two extreme calibration curves represent the maximum-to-minimum spread in dose over the range of 3–10 Gy to be ±8%, implying to be of the order of ±4.5%.

Image of FIG. 5.
FIG. 5.

Representation of dose-response curve for a single beam . The dashed lines represent 95% confidence limits for the fit and the error bars represent one standard deviation (0.9% in OD and 0.5% in dose).

Image of FIG. 6.
FIG. 6.

Ratio of OD to initial value showing the variation in OD with time for the films irradiated with 6 MV photon beam to 1, 5, 10, and 15 Gy. Measurements in the red channel were made with an Epson a flatbed scanner using 48-bit color image. After irradiation, the OD reached 99% of its plateau values in 42, 44, 61, and 68 h for films exposed to 15, 10, 5, and 1 Gy, respectively.

Tables

Generic image for table
TABLE I.

Characteristics of radiation sources employed in this investigation.

Generic image for table
TABLE II.

Postirradiation wait-time spread (hours) to achieve error due to self-development.

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/content/aapm/journal/medphys/37/5/10.1118/1.3373523
2010-04-08
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy dependence and dose response of Gafchromic EBT2 film over a wide range of photon, electron, and proton beam energies
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/5/10.1118/1.3373523
10.1118/1.3373523
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