Electret devices for measuring ionizing radiation
OwnerJacques Lewiner, Gerard Dreyfus +1inventors
InventorsJacques Lewiner, Gerard Dreyfus, Didier Perino
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Abstract
The device comprises, on the one hand, a cassette containing an electret between two electrodes and, on the other hand, a fixed reader adapted to receive the cassette in a pocket, to identify it, to measure the charge of its electret and to display data relating to this charge. This reader comprises also a head adapted to record the data on an area (or strip) of the cassette and there are provided readers independent of the aforesaid reader adapted to subsequently receive the cassette, to measure the charge of its electret, to read the data and, by difference between the measured value and that read, to display the radiation dose received by the cassette since its recording.
Claims10
Measuring device for ionizing radiation comprising, at least one cassette containing an electret disposed between two electrodes which are separated from one another so as to provide between the electret and one electrode an ionizing chamber sensitive to the radiation to be measured and at least one "entry" reader comprising a pocket for receiving the cassette in a predetermined position therein, a source of electrical current, means for identifying the cassette, means for reading and measuring the charge of the electret contained in the cassette and means for displaying data related to the result of said measurement, said device comprising in addition at least one auxiliary reader, each cassette comprising means for automatically receiving the recording of data relating to the charge of the electret thereof when the cassette is initially inserted into the entry reader and to present the recorded data so that this data can be read automatically upon the insertion of the cassette into an auxiliary reader, each entry reader comprising, in addition to means for measuring the momentary charge of the electret contained in each cassette which is introduced therein, means for processing the said data and for recording said data on said inserted cassette, and each auxiliary reader comprising, in addition to means for measuring the momentary charge of the electret contained in each cassette which is inserted therein, means for reading the data previously recorded on this cassette and means for calculating and displaying data connected with the difference between two successively measured charges of the electret.
Dependencies are inferred from the claim text.