Accurate measurement of P(K)w(K) in the decay of 58Co and the fluorescence yield of iron
In view of the discrepancies among different experimental values, and with the aim of improving the accuracy on the fluorescence yield of Fe, the P(K)w(K) value has been measured by means of a (KX ray-gamma ray) coincidence method. Radioactive sources were prepared by evaporation in vacuum to minimise self-attenuation of X-rays in the source. Source purity was checked by gamma- and X-ray spectrometry, and source homogeneity by autoradiography. A NaI(Tl) detector was employed for the gamma-ray channel, and a gas-flow proportional counter, filled with Xe as main counting gas, was used for the X-ray channel of the detection system. A controlled flow was necessary to ensure gain stability of the counter. A system for recovering and purifying the Xe had to be built. From the measured (KX ray-gamma ray) coincidence count rate and the single gamma-ray count rate, the P(K)w(K) value could be deduced. With P(K) from the literature, w(K) could be calculated. The uncertainty of the w(K) determination is smaller than 2%.
Bibliographic Reference: Paper presented: International Symposium on Radionuclide Metrology and its Applications (ICRM '91), Madrid (ES), May 27-31, 1991
Availability: Available from (1) as Paper EN 36204 ORA
Record Number: 199111218 / Last updated on: 1994-12-02
Original language: en
Available languages: en