TY - BOOK
T1 - Part 1: Development of a track-etch method for extracting uranium containing particles from swipes. Part 2: Development of a SIMS method for isotopic analysis of uranium containing particles. Report on Task FIN A 1318 of the Finnish Support Programme to IAEA Safguards
T2 - Report on Task FIN A 1318 of the Finnish Support Programme to IAEA Safeguards
AU - Lipponen, Maija
AU - Lehto, Sari
PY - 2002
Y1 - 2002
N2 - The first part of the report describes the development of
a track-etch method for identification of uranium
containing particles extracted from swipe samples.
Uranium oxide spiked samples were ashed and the residue
was collected in a Collodion solution. The mixture was
spread on Makrofol solid state nuclear detectors which
were irradiated with neutrons in the TRIGA Mk II reactor
in Otaniemi. The etched detectors were examined under a
polarising microscope to locate the fission tracks and
the uranium containing particles in the Collodion film.
Picking of the particles was tried out by dissolving the
Collodion film surrounding an identified particle with
acetone and using a micro injector to extract it and to
place it in a vial for subsequent isotopic analysis by
inductively coupled plasma mass spectrometry (ICP-MS).
The second part of the report describes a secondary ion
mass spectrometric (SIMS) method for measuring the
n(235U)/n(238U) in uranium containing particles with the
VG IX70Ssecondary ion mass spectrometer at VTT. The
method was validated with four of the NIST uranium oxide
Standard Reference Materials having nominal
n(235U)/n(238U) of 0.005, 0.03, 0.25 and 1. In addition,
the n(235U)/n(238U) in the IAEA SR54 and in a depleted
uranium oxide powder from STUK were determined and
compared to values measured by ICP-MS. The accuracy of
the measured isotope ratios was 2-5% and the
repeatability of the ratiosin particles sized 3-10 µm in
diameter ranged from 0.01 (RSD) for the 1:1 ratio up to
0.16 (RSD) for the small ratios (0.0072 of NatU).
Participation in the sensitivity round robin organised by
the Institute for Transuranium Elements and the IAEA is
also shortly dealt with.
AB - The first part of the report describes the development of
a track-etch method for identification of uranium
containing particles extracted from swipe samples.
Uranium oxide spiked samples were ashed and the residue
was collected in a Collodion solution. The mixture was
spread on Makrofol solid state nuclear detectors which
were irradiated with neutrons in the TRIGA Mk II reactor
in Otaniemi. The etched detectors were examined under a
polarising microscope to locate the fission tracks and
the uranium containing particles in the Collodion film.
Picking of the particles was tried out by dissolving the
Collodion film surrounding an identified particle with
acetone and using a micro injector to extract it and to
place it in a vial for subsequent isotopic analysis by
inductively coupled plasma mass spectrometry (ICP-MS).
The second part of the report describes a secondary ion
mass spectrometric (SIMS) method for measuring the
n(235U)/n(238U) in uranium containing particles with the
VG IX70Ssecondary ion mass spectrometer at VTT. The
method was validated with four of the NIST uranium oxide
Standard Reference Materials having nominal
n(235U)/n(238U) of 0.005, 0.03, 0.25 and 1. In addition,
the n(235U)/n(238U) in the IAEA SR54 and in a depleted
uranium oxide powder from STUK were determined and
compared to values measured by ICP-MS. The accuracy of
the measured isotope ratios was 2-5% and the
repeatability of the ratiosin particles sized 3-10 µm in
diameter ranged from 0.01 (RSD) for the 1:1 ratio up to
0.16 (RSD) for the small ratios (0.0072 of NatU).
Participation in the sensitivity round robin organised by
the Institute for Transuranium Elements and the IAEA is
also shortly dealt with.
KW - environmental sampling
KW - uranium containing particles
KW - isotopic analysis
KW - fission track-etch method
KW - secondary ion mass spectrometry
KW - SIMS
M3 - Report
SN - 951-712-582-8
T3 - STUK-YTO-TR
BT - Part 1: Development of a track-etch method for extracting uranium containing particles from swipes. Part 2: Development of a SIMS method for isotopic analysis of uranium containing particles. Report on Task FIN A 1318 of the Finnish Support Programme to IAEA Safguards
PB - Radiation and Nuclear Safety Authority STUK
CY - Helsinki
ER -