Description of the problem

The experiment to measure gas bremsstrahlung at the ADONE storage ring at LNF, and compare results to Monte Carlo predictions, was performed by exposing matrices of LiF thermoluminescent dosimeters (TLDs) to the generated radiations[1]. The TLD matrices were exposed inside PVC sheets (1 mm thick) placing them downstream of a straight section of the storage ring. The straight section, 613.5 cm long, ended in a vacuum guide 190.7 long, closed by a 1.87 cm thick stainless steel flange. In the simulation it can be represented by an air target hit by an 1.5 GeV electron beam, with has a rectangular spot 0.4x0.02 $cm^2$ wide. The absorbed doses are determined by 9-by-9 matrices of TLDs placed at various distances from the end of the straight section, from 211.7 cm to 941.7 cm. The TLDs consist of $^7$LiF of dimensions 3.175$\times$3.175$\times$0.889 $mm^{3}$. The area covered by the TLD matrix is therefore 28.57$\times$28.57 $mm^{2}$ with enough granularity to reveal the expected narrow angular distribution of the bremsstrahlung intensity.