Absorption Spectroscopy of EBT Model GAFCHROMIC TM Film

Published

October 12, 2021

Author(s)

Slobodan Devic, Tomic Nada, Zhiyu Pang, Jan Seuntjens, Ervin Podgorsak, C K. Ross, Norman V. Klassen, Christopher G. Soares

Abstract

The introduction of radiochromic films has solved some of the problems associated with conventional 2D radiation detectors. Their high spatial resolution, low energy dependence and near tissue-equivalence make them ideal for measurement of dose distributions in radiation fields with high dose gradients. Precise knowledge of the absorption spectra of these detectors can help to develop more suitable optical densitometers and potentially extend the use of these films to other areas such as the measurement of the radiation beam spectral information. The goal of this study is to present results of absorption spectra measurements for the new GAFCHROMIC TM film, EBT type exposed to 6 MV photon beam in the dose range from 0 to 6 Gy. Spectroscopic analysis reveals that in addition to the two main absorption peaks, centered at around 583 nm and 635 nm, the absorption spectrum in the spectral range from 350 nm to 800 nm contains six more absorption bands. Comparison of the absorption spectra reveals that previous MD-810, MD-55, as well as HS GAFCHROMIC TM film models have nearly the same sensitive layer base material, whereas the new, EBT model, GAFCHROMIC TM film has a different composition of its sensitive layer. We have found that the two most prominent absorption bands in EBT model radiochromic film do not change their central wavelength position with change in a dose deposited to the film samples.

Citation

Medical Physics

Pub Type

Journals

Citation

Devic, S. , Nada, T. , Pang, Z. , Seuntjens, J. , Podgorsak, E. , Ross, C. , Klassen, N. and Soares, C. (2021), Absorption Spectroscopy of EBT Model GAFCHROMIC TM Film, Medical Physics (Accessed October 30, 2025)