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Gafchromic Film, MD-V3, 5 x 5 Inch

Gafchromic Film, MD-V3, 5 x 5 Inch
Item Number :
115-002

Gafchromic® Film, MD-V3, 5" x 5".

Details

Gafchromic® Film, MD-V3, 5" x 5".

The GAFCHROMIC MD-V3 radiochromic dosimetry film is designed for the measurement of absorbed dose of high-energy photons.  The response of the film is energy-independent to photons of 0.2MeV energy or more.  The GAFCHROMIC MD-V3 is a direct replacement for the GAFCHROMIC MD-V2-55 Film.

The structure of GAFCHROMIC MD-V3 radiochromic dosimetry film is comprised of an active layer, nominally 15µm thick, containing the active component, marker dye, stabilizers and other components giving the film its near energy-independent response.  The thickness of the active layer may vary slightly from batch-to-batch.  The active layer is sandwiched between two 120µm matte polyester substrates.

Key technical features of GAFCHROMIC MD-V3 include: 
• Dynamic Dose range: 1 Gy to 100 Gy

• 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 5µm;

• Can be handled in room light - eliminates the need for a darkroom;

• Active coating exposed for detection of low energy photon and Electron

New and improved features over the previous generation (GAFCHROMIC MD-V2-55):
• Proprietary new technology incorporating a marker dye in active layer to enable use of multichannel dosimetry1 with FilmQAPro 3.0 software2 corrects scanner and film artifacts including uniformity

• Mitigates lateral response dependence

• Enables channel-to-channel consistency measurement as an integrity check

• Decreases UV/light sensitivity;

• New matte film base to eliminate Newton's Rings artifact associated with scanning of the film

• Improved uniformity of response

• Stable at temperatures up to 140°F (60°C)

The most exciting new feature of GAFCHROMIC® MD-V3 over the previous generation of GAFCHROMIC® HD810 dosimetry film is the incorporation of a yellow marker dye.  Used in conjunction with an rgb film scanner and FilmQAPro™ software, the marker dye in MD-V3 film enables all the benefits of multi-channel dosimetry.  Using the marker dye feature is not mandatory.  You can continue to perform dosimetry using only the red color channel, but you give up all the advantages of the multi-channel method that will make your film dosimetry better.

Performance Data and Practical User Guidelines
The GAFCHROMIC MD-V3 dosimetry film can be handled in normal room light for at least several hours without noticeable effects.  However, it is suggested that the film should not be left exposed to room light indefinitely, but rather should be kept in the dark when it is not being handled.  When the active component in GAFCHROMIC® MD-V3 film is exposed to radiation, it reacts to form a blue colored polymer with absorption maxima at approximately 633 nm.

GAFCHROMIC MD-V3 radiochromic dosimetry film may be measured with transmission densitometers, film scanners or spectrophotometers.  The response of MD-V3 is enhanced by measurement with red light.  In using a spectrophotometer the greatest response is obtained by scanning the film and using the peak absorbances.  Most densitometers measure over a band of wavelengths and transmission densitometers for measuring colored films measure over various narrow color bands within the visible spectrum, e.g. visual, red, green and blue.  Such densitometers are commonly and widely employed in the photographic industry.

To obtain two-dimensional information in speedy fashion, flatbed color scanners will work well with all GAFCHROMIC films including MD-V3 films.  The commonly available professional photo scanners such as EPSON Expression 10000XL, V750, V700 and 1680 flatbed color scanners can be used.  These scanners are color scanners and measure the red, green and blue color components of the film at a color depth of 16 bit per channel.

1. Micke, A., Lewis, D.F., Yu, X. "Multichannel film dosimetry with nonuniformity correction," Med Phys, 38(5), 2523-2534 (2011).

2. FilmQAPro 3.0 software can be downloaded at www.filmqapro.com

Specifications
Configuration:
 Active layer on 5 mil (120µ) matte polyester substrate
Size:  5" x 5"
Dynamic Dose Range:  1 to 100 Gray
Energy Dependency:  <5% difference in net density when exposed at 1 MeV and 18 Mev
Dose Fractionation Response:  <5% difference in net density for a single 100 Gy dose and five cumulative 20 Gy doses at 30 min. intervals
Dose Rate Response:  <5% difference in net density2 for 10 Gy exposures at rates of 3.4 Gy/min. and 0.034 Gy/min.
Stability in Light:  <0.005 change in density per 1000 lux-day
Stability in Dark (Preexposure):  <5x10-4 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