1570-1571 / 2239
DETECTORS FOR MEASUREMENT-2D/3D detectors
Radiochromic films
PRIOR EBT GAFCHROMIC FILMS
[HD-810; MD-55-2; HS]
Low sensitivity
Small size
Inherent optical density non-uniformity in one
sheet (15%)
[Need of double-exposure]
High price
POST EBT GAFCHROMIC FILMS (2004)
[EBT;EBT2;EBT3;EBT XD]
Dose range 2cGy – 8 Gy
Saturation ~ 10Gy (15Gy)
Different sizes available
Z
eff
~ 7.05 (chlorine addition)
Significant better homogeneity
[no need of double-exposure techniques]
12
Utretch 2016
Lower price
Replaced by EBT2 (2009): addition of a yellow
marker dye [allows corrections of non thickness
uniformity of the active layer when using flat bed
scanners]
EBT3 (2011) symmetrical construction and anti-
Newton rings.
Use of laser densitometers creates interference
patterns. NOT RECOMMENDED