Experimental investigation of GafChromic EBT3 intrinsic energy dependence with kilovoltage x rays, Cs, and Co.

Purpose: To determine experimentally the intrinsic energy response, k , of EBT3 GafChromic radiochromic film with kilovoltage x rays, Cs, and Co in therapeutic and diagnostic dose ranges through direct measurement with an accompanying mathematical approach to describe the physical processes involved.

Methods: The EBT3 film was irradiated with known doses using Co, Cs, and 13 NIST-matched kilovoltage x-ray beams. Seven dose levels, ranging from 57 to 7002 mGy, were chosen for this work.