Counting chamber for alpha-spectrometric measurements

Commercially available chambers can not be depended on to be vacuum-tight; the mechanisms for positioning the sample are awkward and unreliable and there is no provision for protecting the detector. A chamber that is not subject to these difficulties and that provides nearly fool-proof detector protection was designed and several that were built were found to perform satisfactorily. Diagrams are presented to show the alpha spectrometry system with mounted chambers and details of one chamber