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Titolo:
A RADON PROGENY SAMPLER FOR THE DETERMINATION OF EFFECTIVE DOSE
Autore:
SOLOMON SB;
Indirizzi:
AUSTRALIAN RADIAT LAB,LOWER PLENTY RD YALLAMBIE VIC 3085 AUSTRALIA
Titolo Testata:
Radiation protection dosimetry
fascicolo: 1, volume: 72, anno: 1997,
pagine: 31 - 42
SICI:
0144-8420(1997)72:1<31:ARPSFT>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNATTACHED RADON; AIRBORNE RADIOACTIVITY; DIFFUSION BATTERIES; SIZE DISTRIBUTION; URANIUM-MINE; WIRE SCREENS; DAUGHTERS; PARTICLES; FRACTION; AEROSOL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
S.B. Solomon, "A RADON PROGENY SAMPLER FOR THE DETERMINATION OF EFFECTIVE DOSE", Radiation protection dosimetry, 72(1), 1997, pp. 31-42

Abstract

The design and simulated performance is described of a two-stage sampler (HE-Sampler) for Rn-222 progeny. This HE-Sampler has a collection efficiency optimised to match the particle size dependency of the radon progeny dose conversion factor (DCF), derived from the latest Respiratory Tract Model of the International Commission on Radiological Protection, as implemented in the computer code RADEP. The HE-Sampler comprises a wire screen pre-separator, matched to the nasal deposition, and a wire screen collector, matched to the respiratory tract collection. This HE-Sampler allows for the estimation of the radiation dose fromthe inhalation of Rn-222 progeny, derived from two concurrent alpha particle activity measurements, one on the HE-Sampler screen collector and one on a reference filter sample. As a first approximation, the DCF is proportional to the collected fraction. The HE-Sampler response was simulated for a range of radon progeny size distributions to determine the error in the estimated DCF values. For monodispersed radon progeny the DCF errors were up to 35%. For polydispersed radon progeny distributions in the range 1 nm to 1000 nm, the DCF error was in the range +/-10% and +/-20%, for occupational and environmental exposure, respectively. This error range can be reduced to +/-10% between 0.6 nm and 700 nm by using a polynomial fitting function. The simulated response to complex particle size distributions was investigated using a dataset of 70 experimental measurements taken as representative of environmental and occupational exposure. For environmental exposure, the derived mean DCF error and the root mean square (RMS) error were +3.6% and +/-4.8% for polynomial fitting functions, respectively. The corresponding values for occupational exposure were 0.5% and +/-3.1%. The effect of systematic errors in the operating parameters was investigated using a further simulation based on this experimental data set. The simulation results show that the HE-Sampler is relatively insensitive to variations in sampling rate and in the screen parameters, particularlyfor environmental exposure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 18:53:40