Accelerator mass spectrometry of 99Tc

L. K. Fifield; R. S. Carling; R. G. Cresswell; P. A. Hausladen; M. L. Di Tada; J. P. Day

doi:10.1016/S0168-583X(99)01094-0

Accelerator mass spectrometry of ⁹⁹Tc

L. K. Fifield, R. S. Carling, R. G. Cresswell, P. A. Hausladen, M. L. Di Tada, J. P. Day

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22 Scopus citations

Abstract

The measurement of low levels of ⁹⁹Tc (T_1/2 = 213 ka) by accelerator mass spectrometry (AMS) is reported for the first time. Because there are no stable isotopes of technetium, the ⁹⁹Tc content of a sample is determined from the ratio of ⁹⁹Tc to a known trace amount of ¹⁰³Rh. High-purity aluminium oxide constitutes the bulk of each sample. The contribution from the ⁹⁹Ru isobar may be quantified and subtracted using ¹⁰¹Ru. In contrast to conventional AMS in which at least one isotope is measured as a beam current, here all three isotopes, ⁹⁹Tc, ¹⁰¹Ru and ¹⁰³Rh, are counted ion-by-ion in a propane-filled ionization chamber. This ionization chamber permits partial, but not complete, separation of ⁹⁹Tc from ⁹⁹Ru ions. The technique has been validated using a series of standards, as well as a set of five seaweed samples from an inter-laboratory comparison exercise. In addition, the technique has been used to measure the relative intensities of the Tc^- and TcO_m^- (m = 1-4) negative ions from a Cs sputter ion source.

Original language	English
Pages (from-to)	427-436
Number of pages	10
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	168
Issue number	3
DOIs	https://doi.org/10.1016/S0168-583X(99)01094-0
State	Published - Jul 2000
Externally published	Yes

Funding

We are indebted to Dr Martin McCartney for making the results of the 99 Tc inter-laboratory comparison available to us in advance of publication. In addition, we are grateful to Drs Kexin Liu, D H Oughton and C Oldham for assistance with the AMS measurements. The accelerator beam time was provided for this project, in part, under the EPSRC-ANU Joint Agreement, and RSC also acknowledges the support of the EPSRC for research and travel grants. JPD and RSC wish to thank the staff of the Department of Nuclear Physics for maintaining reliable operation of the Heavy Ion Accelerator facility and for their hospitality.

Funders	Funder number
EPSRC-ANU
Engineering and Physical Sciences Research Council
Royal Society of Chemistry

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title = "Accelerator mass spectrometry of 99Tc",

abstract = "The measurement of low levels of 99Tc (T 1/2 = 213 ka) by accelerator mass spectrometry (AMS) is reported for the first time. Because there are no stable isotopes of technetium, the 99Tc content of a sample is determined from the ratio of 99Tc to a known trace amount of 103Rh. High-purity aluminium oxide constitutes the bulk of each sample. The contribution from the 99Ru isobar may be quantified and subtracted using 101Ru. In contrast to conventional AMS in which at least one isotope is measured as a beam current, here all three isotopes, 99Tc, 101Ru and 103Rh, are counted ion-by-ion in a propane-filled ionization chamber. This ionization chamber permits partial, but not complete, separation of 99Tc from 99Ru ions. The technique has been validated using a series of standards, as well as a set of five seaweed samples from an inter-laboratory comparison exercise. In addition, the technique has been used to measure the relative intensities of the Tc- and TcOm- (m = 1-4) negative ions from a Cs sputter ion source.",

author = "Fifield, {L. K.} and Carling, {R. S.} and Cresswell, {R. G.} and Hausladen, {P. A.} and {Di Tada}, {M. L.} and Day, {J. P.}",

year = "2000",

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T1 - Accelerator mass spectrometry of 99Tc

AU - Fifield, L. K.

AU - Carling, R. S.

AU - Cresswell, R. G.

AU - Hausladen, P. A.

AU - Di Tada, M. L.

AU - Day, J. P.

PY - 2000/7

Y1 - 2000/7

N2 - The measurement of low levels of 99Tc (T 1/2 = 213 ka) by accelerator mass spectrometry (AMS) is reported for the first time. Because there are no stable isotopes of technetium, the 99Tc content of a sample is determined from the ratio of 99Tc to a known trace amount of 103Rh. High-purity aluminium oxide constitutes the bulk of each sample. The contribution from the 99Ru isobar may be quantified and subtracted using 101Ru. In contrast to conventional AMS in which at least one isotope is measured as a beam current, here all three isotopes, 99Tc, 101Ru and 103Rh, are counted ion-by-ion in a propane-filled ionization chamber. This ionization chamber permits partial, but not complete, separation of 99Tc from 99Ru ions. The technique has been validated using a series of standards, as well as a set of five seaweed samples from an inter-laboratory comparison exercise. In addition, the technique has been used to measure the relative intensities of the Tc- and TcOm- (m = 1-4) negative ions from a Cs sputter ion source.

AB - The measurement of low levels of 99Tc (T 1/2 = 213 ka) by accelerator mass spectrometry (AMS) is reported for the first time. Because there are no stable isotopes of technetium, the 99Tc content of a sample is determined from the ratio of 99Tc to a known trace amount of 103Rh. High-purity aluminium oxide constitutes the bulk of each sample. The contribution from the 99Ru isobar may be quantified and subtracted using 101Ru. In contrast to conventional AMS in which at least one isotope is measured as a beam current, here all three isotopes, 99Tc, 101Ru and 103Rh, are counted ion-by-ion in a propane-filled ionization chamber. This ionization chamber permits partial, but not complete, separation of 99Tc from 99Ru ions. The technique has been validated using a series of standards, as well as a set of five seaweed samples from an inter-laboratory comparison exercise. In addition, the technique has been used to measure the relative intensities of the Tc- and TcOm- (m = 1-4) negative ions from a Cs sputter ion source.

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JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

IS - 3

ER -

Accelerator mass spectrometry of ⁹⁹Tc

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