Determination of iodine-129 at natural levels using neutron activation and isotopic separation

Abstract

Certain commercial equipment, instruments, or materials are identified in this paper in order to adequately specify the experimental procedure. In no case does such

Iodine-129 in Thyroids of Grazing Animals

“…The sensitivity of their procedure is illustrated by their results on analyzing leaves and finding an upper limit of 6 x 10-l6g 1291/g of leaf (STUDIER et al, 1962). This concentration of 12?I is about two orders of magnitude below the detection limit reported recently for a more elaborate procedure based on neutron activation and isotopic separation of the neutron capture product, 1301, from other iodine isotopes (ROOK et al, 1975).…”

The determination of iodine-129 at natural levels using neutron activation and isotopic separation

“…It was found in previous work with the mass separator that the most reliable method to quantify the percent recovery of the separated isotopes was to use radioisotope dilution (8).…”

“…Past work with cadmium indicated significant losses in the collection of separated isotopes if they were adjacent to, or overlapping the mass region of large abundance stable isotopes (8) .…”

“…This fact, plus the virtual elimination of other radioactive contaminants accounts for the improved sensitivity. The use of an electromagnetic mass separator to effect simple, interferencefree separations in activation analysis has been demonstrated (8) In this project, the total analytical procedure for the 12 9 quantitative analysis o£ I was reviewed and improved wherever possible: a revised preseparat ion of total iodine was developed based on sample combustion and quantitative isolation of iodine. a substantial reduction of system blank was demonstrated by operation in a class 100 clean room; a design change was made on the mass separator which resulted in substantially improved yields; the mass separator operation was optimized and data obtained on yields, intermass contamination and memory;…”

Measurement of I-129 in environmental samples by ICP-CRI-QMS: possibilities and limitations

“…proving the detection capability in broader context [11][12][13][14][15][16]. Up to date, accelerator mass spectrometry (AMS) is the most sensitive technique, which is capable to measure 129 I as low as 10 7 atoms in 1 mg of samples [14].…”