The Development and Application of Calorimeter for Electron Beam Absorbed Dose at Radiation Processing Level

The design principle of calorimeter for electron beam absorbed dose at radiation processing level is concisely described. The methods and results of measuring electron beam absorbed doses with the developed graphite and polystyrene water calorimeters are given. The absorbed doses of reference materials are determined with calorimeter using different absorbing materials and geometric parameters and the results are consistent within 0.8 %. The specially designed phantom for absorbed dose depth distribution mapping can cancel the uncertainty caused by the geometric factors in point source measuring. The absorbed dose response curves of GAF DAM 1260 and FWT 60 radiochromic film to electron beams calibrated by this work are consistent with those to 60 Co gamma rays. The developed calorimeter and measuring methods can be used as measurement standard and dissemination of the value of the absorbed dose determining in accelerator's electron beam radiation sources.