Ionization caused by β-decay of hydrogen-3(tritium)and strontium-90 has been studied by means of a pulse-counting mode of mass spectrometer; Radiation sources are a titanium plate 10mm×15mm carrying, 150 mCi tritium in the form of titanium hyand a silver plate of 12.5mm square with 5 mCi strontium-90 protected by an extremely thin layer of gold. Target materials are H
2 and He gases with the natural abundance ratios. Dependence of the ion peak height on the gas pressure has been examined in the of10
-4-10
-7 Torr, and come to two types of expressions, linear and of cube root. Mechanism of ion formation in this system is discussed, and its tempting applications are presented.
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