Abstract
A neutron activation method has been developed for determining microgram and submicrogram quantities of zirconium in animal tissue. The procedure uses phosphate to aid in the separation of zirconium from interfering radio-isotopes. Tissues are dried, sealed in quartz vials, irradiated at a high flux, and wet-ashed; the zirconium is precipitated as ZrO(H 2PO 4), redissolved, and precipitated as BaZrF 6. This procedure effectively removed interfering radioactive elements. Chemical oxidation and the simple separation procedure were checked by radiotracer experiments, and by processing tissues to which known quantities of zirconium had been added. The detection limit of the method for a 100-h irradiation at 1 × 10 14 n cm -2 s -1 followed by radiochemical processing is 10 ng, based on 2 σ counting statistics. The error is estimated to be ± 5–10%.
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