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Abstract. Inner bremsstrahlung accompanying the first-forbidden beta decay of 86Rb was measured using the magnetic deflection technique with a 4.5 x 5.1 cm2 NaI(T1) crystal in the energy range 200-1660 keV. The raw spectrum was unfolded using the step-by-step process of Starfelt and Liden and compared with KUB, LF and FM theories. The measured spectrum is found to show fairly good agreement with LF theory in the energy range 200-1500 keV and it is found to deviate thereafter from all three theories.

Abstract. Inner bremsstrahlung (IB) accompanying first-forbidden p decay of '"Ag has been measured using the magnetic deflection technique with a 4.5 cm x 5.1 cm NaI(T1) scintillation spectrometer in the energy region 100-1000 keV. The contribution to the IB pulse-height distribution from the two prominent monoenergetic gamma-ray lines emitted by the source was subtracted by constructing their spectra using peak-to-total ratios. peak-tovalley ratios and peak-to-valley separations. The raw spectrum is unfolded following the method of Liden and Starfelt and compared with the theories of KUB, Lewis and Ford (LF) and Ford and Martin (FM). The measured pulse-height distribution is found to show agreement with LF theory in the lower energy region up to 450 keV; it is found to be lower than KUB and FM theories up to 550 keV and thereafter deviates positively from all three theories.

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