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Samson, D.M. (author), Bos, A.J.J. (author)Abstract of NL 1001913 (C2) The integrating detector (1) for measuring low levels of ~c-rays, added (9) to the natural background radiation, is provided with a screen (4) placed between at least two thermo-luminescent dosimeters (5-7). It is covered with a housing. Also claimed is the measurement of low ~c-ray levels using the apparatus above....patent 1997