Sealed radioactive source with no permit requirement on a needle for fitting inside Wilson cloud chamber of Schnurholz design (
559 57). Also suitable for introductory experiments with the Geiger counter (
546 282) and counter tubes (
559 00/
01). * According to German legislation (StrlSchV) it is generally not necessary to obtain a specific permit when handling authorised samples, as long as the total activity, as calculated by the stipulated summation formula, does not exceed the authorised limit. Educational establishments should consult with the responsible authorities as to whether additional regulations need to be observed.
