Sum-coincidence technique forγ-ray studies
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If a radioactive source emitting cascadeγ-rays is placed between two well-matched NaI crystal and multiplier units and pulses from the two units are added electronically, one would get, in the added spectrum, a peak corresponding to the sum of the energies of the cascadeγ-rays. If the pulses in one of the units are analysed in coincidence with the final sum peak, one would get only the photo-peaks of the cascadeγ-rays. This “sum-coincidence” technique has been applied to the study of theγ-rays of Sc46, Sm153 and Eu154. In Eu154 decay, the cascade emission of 320 Kev., 1280 Kev. and 123 Kev.γ-rays has been established; and it has been shown that there is a level in Gd154 at 1850 Kev. which is fed byβ −-emission from Eu154 to the extent of about 3%.
KeywordsRadioactive Source Decay Scheme Pulse Height Analyser Eu154 Gd154
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