GAFChromic Film, EBT3-1417, 13" x 17" (10/Box)

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GAFChromic Film, EBT3-1417, 13" x 17" (10/Box)

GAFChromic™ EBT-3 is designed for the measurement of absorbed doses of ionizing radiation. It is particularly suited for high-energy photons. The dynamic range of this film is designed for best performance in the dose range from 0.2 to 10 Gy, making it suitable for many applications in IMRT, VMAT and brachytherapy. For measurement of doses substantially greater than 10 Gy EBT-XD or MDV3 are preferred while the use of HDV2 is indicated for still higher dose measurement.

Key technical features of GAFChromic EBT3 include

• Dynamic dose range: 0.1 Gy to 20 Gy
• Optimum dose range: 0.2 Gy to 10 Gy, best suited for applications such as IMRT and VMAT
• Develops in real time without post-exposure treatment;
• Energy-dependence: minimal response difference from 100keV into the MV range
• Near tissue equivalent;
• High spatial resolution – can resolve features to at least 25μm, or less
• Proprietary new technology incorporating a marker dye in the active layer:
• Enables non-uniformity correction by using multi-channel dosimetry
• Decreases UV/light sensitivity
• Stable at temperatures up to 60°C (140°F)

Configurations and structures of GAFChromic EBT3 dosimetry film

The structure of EBT3 film is comprised of an active layer, nominally 28 μm thick, sandwiched between two 125 μm matte-polyester substrates. The active layer contains the active component, a marker dye, stabilizers and other components giving the film its near energy-independent response. The thickness of the active layer will vary slightly between different production lots.

Performance Data and Practical User Guidelines

Like all other GAFChromic films, EBT3 dosimetry film can be handled in interior room light for short periods without noticeable effects. However, it is suggested that the film should not be left exposed to room light for hours, but rather should be kept in the dark when not in use. When the active component in EBT3 film is exposed to radiation, it reacts to form a blue colored polymer with absorption maxima at approximately 633 nm.

GAFChromic EBT3 dosimetry film is recommended to be used with a 48- bit (16-bit per channel) flatbed color scanner. The EPSON Expression 11000XL Photo scanner, and the now discontinued model 10000XL Photo scanner are the recommended models. These are color scanners that measure the red, green and blue color components of light transmitted by the film at a color depth of 16 bit per channel. These EPSON scanners are particularly recommended due to their large scanning area.

Storage and handling

Exposure to sunlight should be avoided. The best practice is to store the

film at refrigerator temperature. Its recommended that the film be handled,

exposed and measured at room ambient temperature, 20° - 25°C (68° -

77° F).

References

1. Micke, A., Lewis, D.F., Yu, X. “Multichannel film dosimetry with non-uniformity correction,” Med Phys, 38(5), 2523-2534 (2011).
2. Lewis D., Micke A., Yu X, Chan M.: “An Efficient Protocol for Radiochromic Film Dosimetry combining Calibration and Measurement in a Single Scan”, Medical Physics, 39 (10) 6339(2012)
3. An Efficient Calibration Protocol for Radiochromic Film, April 2011 available at www.filmqapro.com
4. GAFChromic™ EBT3 film specifications, Available at www.gafchromic.com
6. Schoenfeld A, et al, “The artefacts of radiochromic film dosimetry with flatbed scanners and their causation by light scattering from radiation-induced polymers”, Phys. Med. Biol. 59 (2014) 3575
7. D. Lewis and M F. Chan, “Correcting lateral response artifacts from flatbed scanners for radiochromic film dosimetry”, Med. Phys. 42, 416-429 (2015)
8. L. J. van Battum, H. Huizenga, R. M. Verdaasdonk and S. Heukelom,, “How flatbed scanners upset accurate film dosimetry”, Physics in Medicine and Biology, 61(2016), 625-649
9. B. Reimer and H. Baessler, “Photoconduction in a Polydiacetylene Crystal”, Physica Status Solidi 32(2), 435–439 (1975)

Specifications

Configuration: Active layer (28 μm) sandwiched between 125 μm matte surface polyester substrates

Size: 8" x 10" or 13” x 17”

Dynamic Dose Range: 0.1 to 20 Gy

Energy Dependency: <5% difference in net optical density when exposed at 100 keV and 18 MeV

Dose Fractionation Response: <5% difference in net optical density for a single 25 Gy dose and five cumulative 5 Gy doses at 30 minute intervals

Dose Rate Response: <5% difference in net optical density for 10 Gy exposures at rates of 3.4 Gy/min. and 0.034 Gy/min.

Stability in Light: <5x10-3 change in optical density per 1000 lux-day

Stability in Dark (Pre-exposure): <5x10-4 optical density change/day at 23°C (73.4°F) and <2x10-4 density change/day refrigerated

Uniformity: Better than 3% in sensitometric response from mean; dose uniformity better than ±2% with FilmQAPro and triple-channel dosimetry.