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- W49373350 abstract "The method is based on the use of the metastable isomer Co/sup 60m/ which precedes the long-lived Co/sup 60/ after neutron capture. Co/sup 60m/ emits 59-kev gamma radiation and has only 10.8 minutes half life. This enable the use of a very short activation time, about 10 minutes in the Stockholm reactor R1 at 5 x 10/sup 11/ n/cm/sup 2/sec. The method has been applied ro various Swedish steels. Here the presence of manganese is the most disturbing factor which has so far prevented the use of the direct spectrometric analytical technique (thick Nal crystal scintillation detectors and a single-channel pulseheight analyzer). A fast chemical procedure (especially developed by Ingrid Fineman) has been used to avoid this difficulty. It involves rapid dissolving of steel turnings in hydrochloric acid, extraction of iron into diethylether, and selective precipitation (after addition of carrier) of cobalt with nitroso- naphthol. The procedure also makes self-absorption of the soft gamma radiation negligible. A small activity of long-lived Co/sup 60/ is added to the dissolving acid. This is chosen so as not to disturb the spectroraetry but to enable corrections for losses of cobalt during the procedure. The standard consists of a small filter paper on whichmore » a small volume of cobalt solution is evaporated. The whole procedure after activation takes 30 to 40 minutes and seems to be capable of achieving a sensitivity limit of 1 to 2 mu g at the neutron flux used. The estimated maximum error is 5 to 10% in the region 50 to 150 ppm if the sample is 0.1 gram and the abovementioned flux is used. (auth)« less" @default.
- W49373350 created "2016-06-24" @default.
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- W49373350 date "1959-10-31" @default.
- W49373350 modified "2023-09-26" @default.
- W49373350 title "A RAPID METHOD FOR THE DETERMINATION OF COBALT IN REACTOR STEEL BY ACTIVATION ANALYSIS" @default.
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