Electret dosimetry

A brief outline review of the electret state and the basic principles of electret dosimetry is presented. Various prototypes of electret dosimeter have been designed by the Laboratoire d'Electricite Generale de 1'E.S.P.C.I., some of which are now under development by the Societe BEFIC in France. The basic electret ionization chamber is described, together with the principles of practical electret dosimeters, both direct and indirect reading ones. Electret dosimetry appears to have the following advantages: 1) The dose can be read electrically without destroying the information carried by the film itself. 2) dose measurement does not depend on the reliability of the electronic components present in the dosimeter 3) the principle is very simple and adaptable 4) linearity is excellent. (U.K.)