A new measurement of the half-life of (166m)Ho.

Details

Serval ID
serval:BIB_FAA3CDB77E6C
Type
Article: article from journal or magazin.
Collection
Publications
Title
A new measurement of the half-life of (166m)Ho.
Journal
Applied Radiation and Isotopes
Author(s)
Nedjadi Y., Bailat C., Caffari Y., Froidevaux P., Wastiel C., Kivel N., Guenther-Leopold I., Triscone G., Jaquenod F., Bochud F.
ISSN
0969-8043; 1872-9800 (Electronic)
ISSN-L
0969-8043
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
70
Number
9
Pages
1990-1996
Language
english
Notes
Publication types: Journal Article Publication Status: ppublish
Abstract
The work presented here is a new and precise measurement of the half-life of (166m)Ho by determining the activity concentration, using an ionisation chamber calibrated for this nuclide, and measuring the number of (166m)Ho atoms using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Since the isotope (166)Er interferes with the mass spectrometric measurement, Er has to be eliminated from the (166m)Ho radioactive solution. The elimination was achieved using ion-exchange chromatography with the cation exchange resin Dowex AG 50W-X8 and 2-Hydroxybutanoic acid as the mobile phase. After a first transit through the chromatographic column, the purified (166m)Ho eluate was spiked with natural Er to get a resulting Er isotopic composition close to that of natural Er at better than 99.5%, and then it underwent two further separations to eliminate the Er. The activity concentration of this Er-free radioactive (166m)Ho solution was measured in our reference ionisation chamber calibrated for this nuclide by means of the 4πβ(PC)-γ and 4πβ(PS)-4πγ coincidence techniques and integral counting with a well-type NaI(Tl) detector and Monte Carlo efficiencies. An aliquot of this standardized solution was sent to the Paul Scherrer Institute (PSI) for mass concentration determination using an isotope dilution MC-ICP-MS approach. The mass concentration of (166m)Ho in this solution was determined with 0.25% relative standard uncertainty. This value was corroborated by two other independent measurements. The new half-life of (166m)Ho, 1132.6(39) years (k=1), is compatible with the value determined in 1965, but is 5.6% shorter and about 43 times more precise.
Keywords
Chromatography, Ion Exchange, Equipment Design, Equipment Failure Analysis, Half-Life, Holmium/analysis, Holmium/chemistry, Internationality, Mass Spectrometry/instrumentation, Radiation Dosage, Radioisotopes/analysis, Radioisotopes/chemistry, Radiometry/instrumentation, Radiometry/standards, Reference Standards, Reference Values
Pubmed
Web of science
Create date
30/01/2008 8:08
Last modification date
20/08/2019 17:26
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