[PDF]    http://dx.doi.org/10.3952/lithjphys.51209

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 51, 155–161 (2011)

INFLUENCE OF AEROSOL PARTICLE CONCENTRATION ON VOLUMETRIC ACTIVITIES OF INDOOR RADON PROGENY
D. Jasaitis and A. Girgždys
Vilnius Gediminas Technical University, Saulėtekio 11, LT-10223 Vilnius, Lithuania
E-mail: dainius.jasaitis@vgtu.lt

Received 13 April 2011; revised 26 May 2011; accepted 21 June 2011

The influence of aerosol particle concentration on changes of volumetric activities of radon short-lived decay products was investigated. Volumetric activities of radon short-lived products in accommodations under various living conditions were measured. Concentrations of aerosol particles in the air, equilibrium factors, and unattached fraction were determinated under normal living conditions and by increasing the concentration of aerosol particles in the air of the accommodations. An increase of radon short-lived decay products attached to aerosol particles was obtained during a candle or frankincence burn, in smoke-filled compartments, or in steamy kitchen conditions, therefore larger volumetric activity of the alpha particles was registered. Negative correlation coefficient between unattached fraction and the radioactive equilibrium factor, as well as positive correlation coefficient between the radioactive equilibrium factor and aerosol particle concentration in the air of accommodations has been determined. Seasonal changes of the radioactive equilibrium factor are presented.
Keywords: radon, short-lived decay products, volumetric activity, aerosol particle, radioactive equilibrium factor, unattached fraction factor
PACS: 23.60.+e, 89.40.Dd, 89.60.Ec


AEROZOLIO DALELIŲ KONCENTRACIJOS ĮTAKA RADONO SKILIMO PRODUKTŲ TŪRINIAM AKTYVUMUI PATALPOSE
D. Jasaitis, A. Girgždys
Vilniaus Gedimino technikos universitetas, Vilnius, Lietuva

Tirta aerozolio dalelių skaitinės koncentracijos įtaka radono trumpaamžių skilimo produktų tūrinio aktyvumo pokyčiui gyvenamosiose patalpose. Išmatuoti radono ir jo trumpaamžių skilimo produktų tūriniai aktyvumai patalpose įvairiomis gyvenimo sąlygomis. įvertintos aerozolio dalelių koncentracijos ore, radioaktyviosios pusiausvyros koeficiento ir laisvosios frakcijos koeficiento vertės įprastomis gyvenimo sąlygomis bei dirbtinai padidinus aerozolio dalelių koncentraciją ore. Nustatyta, kad patalpoje deginant žvakę ar smilkalus, rūkant, gaminant valgį, padaugėja laisvųjų radono trumpaamžių skilimo produktų atomų, prisijungusių prie aerozolio dalelių. Šiuo atveju registruotas didesnis alfa dalelių tūrinis aktyvumas. Nustatyta neigiama laisvosios frakcijos koeficiento ir radioaktyviosios pusiausvyros koeficiento koreliacija. Gauta teigiama radioaktyviosios pusiausvyros koeficiento ir aerozolio dalelių koncentracijos patalpų ore koreliacija. Pateikiami radioaktyviosios pusiausvyros koeficiento sezoniniai pokyčiai.

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