Abstract
During our research work on the properties of CsI(Tl)-scintillation crystals and their use for β-spectroscopy it was found that these crystals have essential advantages at least for radiochemical purposes compared with the usual scintillation materials. The strongly from theory deviating form of β-spectra measured with CsI(Tl)-crystals could be explained to result undoubtedly from backdiffusion of β-radiation out of the crystal. However, these changes of the spectral distribution have the great advantage that β-maximum-energies can often be directly extrapolated with sufficient accuracy without working out a Fermi-Kurie-plot even when some different β-groups superimpose in the spectrum. A radiochemist's demand for a safe and relatively simple method suitable for quick control of separation problems can be satisfied without large mathematical apparatus by the described method.
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