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Abstract

For measuring the levels of beam intensity on surfaces the testpiece is disposed as close as possible to a location-sensitive proportional counting tube and overlaid with counting gas. The electron avalanche in the counting tube, which occurs subsequent to disassociation due to gas amplification is registered in such a way as to identify position. Because of the divergence of the particle beam from the testpiece, the degree of locational resolution of the counting tube is however insufficient for the analysis of certain isotopes. The apparatus according to the invention improves the degree of locational resolution by means of mechanical collimators which are adapted to the size of the testpiece and which in that dimension decrease continuously or in steps towards the electrode, without in that respect reducing the formation of an electron avalanche, which is precisely linked to position, on the counting wire.

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First Claim