| http://www.w3.org/ns/prov#value | - DESCRIPTION OF THE PREFERRED EMBODIMENTS In order that the detector of FIG. 1 should operate as a spark chamber, the filling-gas pressure and the value of the anode voltage which has to be stabilized are adjusted in such a manner as to obtain in the presence of a radioactive source a sufficient number of sparks to permit the forming an image in a time interval of a few minutes.
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