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Enhancing Nuclear Safety


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The calibration of Discrete Particle Counters and Condensation Nucleus Counters

B. Thaveau (AEROLAB), D. Boulaud (IRSN) - Congrès international de métrologie -Toulon - 20-23 octobre 2003

Document type > *Congrès/colloque

Keywords > calibration, particles

Research Unit > IRSN/DSU/SERAC

Authors > BOULAUD Denis

Publication Date > 20/10/2003

Summary

The calibration of Discrete Particle Counters and Condensation Nucleus Counters in terms of size and number is required before testing clean rooms and clean zones which are classified by the particle concentrations in the air. The calibration for sizing is relatively easy thanks to calibrated latex spheres but the calibration for numbers remains a delicate operation and is more complicated to conduct . With the Laboratory of Physics and Metrology of aerosol and Confinement of I.R.S.N (Institut of Radioprotection and Nuclear Security) the company AEROLAB has developed a method of calibration for counting which takes into account standard methods for clean room verification and technology used in aerosol physics. The method is based on the measurement of the electrical charge of monodisperse particles, carrying only one elementary charge, in the 0,01 to 1 µm range . Particles are collected by a filter which is connected to a very high sensitive electrometer. The particles induce a direct current which is measured by the electrometer and may have a traceable measurement. The calibration ring includes a monodispersed particles generating device and a reference apparatus in a parallel connection with a Condensation Nucleus Counter which is used as a working standard. Then this working standard is used to calibrate the discrete particle counters and the Condensation Nucleus Counters.
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