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A method to determine collection efficiency of particles by swipe sampling

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J R Verkouteren, J L Coleman, R A Fletcher, W J Smith, G A Klouda and G Gillen

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A methodology was developed to evaluate particle collection efficiencies from swipe sampling of trace residues. Swipe sampling is used for many applications where trace residues must be collected, including the evaluation of radioactive particle contamination and the analysis of explosives and contraband at screening checkpoints using ion mobility spectrometry (IMS). Collection efficiencies were evaluated for micrometer-sized polystyrene latex (PSL) spheres with respect to the particle size and mode of deposition, collection trap, surface type and swiping force. Test surfaces containing particles were prepared under controlled conditions and swiped with a reproducible technique that allows for the evaluation of frictional forces. Collection efficiencies were determined by optical imaging and particle counting. Of the two IMS collection traps studied, the polytetrafluoroethylene (PTFE) trap has significantly lower collection efficiencies. This is likely to be due to a combination of texture and composition. The larger (42 µm diameter) particles are collected more efficiently than the smaller (9 µm diameter) particles. Particles in a matrix similar to latent fingerprints are collected more efficiently than dry particles. Applying greater force during swiping does not greatly improve collection efficiencies. This fact, coupled with the observation that many particles are detached but not collected, implies that improvements in collection efficiency are dependent on improvements in adhesion of the particles to the collection surface, rather than larger forces to detach the particles.


PACS

89.60.-k Environmental studies

29.40.-n Radiation detectors

89.20.Mn Forensic science

82.80.-d Chemical analysis and related physical methods of analysis

28.70.+y Nuclear explosions

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Environmental and Earth science

Particle physics and field theory

Chemical physics and physical chemistry

Dates

Issue 11 (November 2008)

Received 3 July 2008

Published 22 September 2008



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