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Characterization of a new commercial single crystal diamond detector for photon- and proton-beam dosimetry.

Akino Y, Gautam A, Coutinho L, Würfel J, Das IJ - J. Radiat. Res. (2015)

Bottom Line: To evaluate the effects of the pre-irradiation, the diamond detector, which had not been irradiated on the day, was set up in the water tank, and the response to 100 MU was measured every 20 s.The profile of the diamond detector was very similar to those of the EDGE and SFD detectors, although the Semiflex and PinPoint chambers showed volume-averaging effects in the penumbrae region.However, at least 1000 cGy of pre-irradiation will be needed for accurate measurements.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis 46202, USA Present address: Division of Health Sciences, Osaka University Graduate School of Medicine, 1-7 Yamadaoka, Suita, Osaka 565-0871, Japan.

No MeSH data available.


(a) Profiles of 6-MV photon beams of 3 × 3 cm2, 10 × 10 cm2, 20 × 20 cm2, and 30 × 30 cm2 field size measured at dmax. (b) Profiles of 3 × 3 cm2 field size are focused. Note the diamond detector provides a superior profile.
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RRV044F6: (a) Profiles of 6-MV photon beams of 3 × 3 cm2, 10 × 10 cm2, 20 × 20 cm2, and 30 × 30 cm2 field size measured at dmax. (b) Profiles of 3 × 3 cm2 field size are focused. Note the diamond detector provides a superior profile.

Mentions: Figure 6a shows the OCR of the 6-MV X-ray beam with various field sizes measured at dmax. For large field sizes, only the SFD showed larger values in the ‘tail’ region. Figure 6b illustrates the OCR of 3 × 3 cm2 field size. The diamond, EDGE detector and SFD showed almost identical profiles with steep penumbrae. The Semiflex chamber showed an averaging effect at the penumbrae region. Although the PinPoint chamber showed a slightly better profile, the averaging effect is still observed.Fig. 6.


Characterization of a new commercial single crystal diamond detector for photon- and proton-beam dosimetry.

Akino Y, Gautam A, Coutinho L, Würfel J, Das IJ - J. Radiat. Res. (2015)

(a) Profiles of 6-MV photon beams of 3 × 3 cm2, 10 × 10 cm2, 20 × 20 cm2, and 30 × 30 cm2 field size measured at dmax. (b) Profiles of 3 × 3 cm2 field size are focused. Note the diamond detector provides a superior profile.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4628217&req=5

RRV044F6: (a) Profiles of 6-MV photon beams of 3 × 3 cm2, 10 × 10 cm2, 20 × 20 cm2, and 30 × 30 cm2 field size measured at dmax. (b) Profiles of 3 × 3 cm2 field size are focused. Note the diamond detector provides a superior profile.
Mentions: Figure 6a shows the OCR of the 6-MV X-ray beam with various field sizes measured at dmax. For large field sizes, only the SFD showed larger values in the ‘tail’ region. Figure 6b illustrates the OCR of 3 × 3 cm2 field size. The diamond, EDGE detector and SFD showed almost identical profiles with steep penumbrae. The Semiflex chamber showed an averaging effect at the penumbrae region. Although the PinPoint chamber showed a slightly better profile, the averaging effect is still observed.Fig. 6.

Bottom Line: To evaluate the effects of the pre-irradiation, the diamond detector, which had not been irradiated on the day, was set up in the water tank, and the response to 100 MU was measured every 20 s.The profile of the diamond detector was very similar to those of the EDGE and SFD detectors, although the Semiflex and PinPoint chambers showed volume-averaging effects in the penumbrae region.However, at least 1000 cGy of pre-irradiation will be needed for accurate measurements.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis 46202, USA Present address: Division of Health Sciences, Osaka University Graduate School of Medicine, 1-7 Yamadaoka, Suita, Osaka 565-0871, Japan.

No MeSH data available.