The influence of an electrostatic precipitator and a mechanical filter on Rn decay products

Markku Rajala, Kauko Janka, Matti Lehtimäki, Vesa Kulmala, Gunnar Graeffe

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

In the present work the effect of an HEPA filter and an electrostatic precipitator on the behaviour of Rn decay products has been studied in laboratory conditions. Both filters were found to decrease the equilibrium factor of progeny and increase the unattached fraction of decay products. In a clean air they also decreased the activity of unattached progeny. An electrostatic precipitator was found to produce condensation nuclei which were observable when no other particle sources were present. The ozone produced by the corona discharge of the filter probably has a great effect on the production of these submicron particles. The impurities of the air were found to grow the panicles and thus their influence on the behaviour of Rn decay products became in some cases significant.
Original languageEnglish
Pages (from-to)447 - 455
Number of pages9
JournalHealth Physics
Volume50
Issue number4
Publication statusPublished - 1986
MoE publication typeNot Eligible

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Static Electricity
Air
Ozone

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Rajala, M., Janka, K., Lehtimäki, M., Kulmala, V., & Graeffe, G. (1986). The influence of an electrostatic precipitator and a mechanical filter on Rn decay products. Health Physics, 50(4), 447 - 455.
Rajala, Markku ; Janka, Kauko ; Lehtimäki, Matti ; Kulmala, Vesa ; Graeffe, Gunnar. / The influence of an electrostatic precipitator and a mechanical filter on Rn decay products. In: Health Physics. 1986 ; Vol. 50, No. 4. pp. 447 - 455.
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Rajala, M, Janka, K, Lehtimäki, M, Kulmala, V & Graeffe, G 1986, 'The influence of an electrostatic precipitator and a mechanical filter on Rn decay products', Health Physics, vol. 50, no. 4, pp. 447 - 455.

The influence of an electrostatic precipitator and a mechanical filter on Rn decay products. / Rajala, Markku; Janka, Kauko; Lehtimäki, Matti; Kulmala, Vesa; Graeffe, Gunnar.

In: Health Physics, Vol. 50, No. 4, 1986, p. 447 - 455.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The influence of an electrostatic precipitator and a mechanical filter on Rn decay products

AU - Rajala, Markku

AU - Janka, Kauko

AU - Lehtimäki, Matti

AU - Kulmala, Vesa

AU - Graeffe, Gunnar

PY - 1986

Y1 - 1986

N2 - In the present work the effect of an HEPA filter and an electrostatic precipitator on the behaviour of Rn decay products has been studied in laboratory conditions. Both filters were found to decrease the equilibrium factor of progeny and increase the unattached fraction of decay products. In a clean air they also decreased the activity of unattached progeny. An electrostatic precipitator was found to produce condensation nuclei which were observable when no other particle sources were present. The ozone produced by the corona discharge of the filter probably has a great effect on the production of these submicron particles. The impurities of the air were found to grow the panicles and thus their influence on the behaviour of Rn decay products became in some cases significant.

AB - In the present work the effect of an HEPA filter and an electrostatic precipitator on the behaviour of Rn decay products has been studied in laboratory conditions. Both filters were found to decrease the equilibrium factor of progeny and increase the unattached fraction of decay products. In a clean air they also decreased the activity of unattached progeny. An electrostatic precipitator was found to produce condensation nuclei which were observable when no other particle sources were present. The ozone produced by the corona discharge of the filter probably has a great effect on the production of these submicron particles. The impurities of the air were found to grow the panicles and thus their influence on the behaviour of Rn decay products became in some cases significant.

M3 - Article

VL - 50

SP - 447

EP - 455

JO - Health Physics

JF - Health Physics

SN - 0017-9078

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Rajala M, Janka K, Lehtimäki M, Kulmala V, Graeffe G. The influence of an electrostatic precipitator and a mechanical filter on Rn decay products. Health Physics. 1986;50(4):447 - 455.