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《Radialization Protection》 1993-01
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MEASUREMENT OF COUNTING EFFICIENCIES FOR ALPHA PARTICLES OF RADON DAUGHTERS DEPOSITED ON WIRE SCREENS

Ren Tianshan(Laboratory of Inductrial Hygiene,MPH, Beijing, 100088)S.B.Solomon(Australian Radiation Laboratory,Lower Plenty Road,Yallambie,Vic.3085)  
Counting efficiencies for alpha particles emitted from the front and the back of 30,105,200 and 400 mesh wire screens were measured for ultrafine radon daughter aerosols deposited at linearvelocities in the range 5.1 to 30.8 cm/s.Mean activity median aerodynamic diameters(AMAD)forthe ultrafine Po-218,Pb-214 and Bi-214 particles were 0.85(±0.44),1.6(±0.8)and 2.4(±2.0)nm(diffusion coefficients 0.068,0.044 and 0.042 cm~2/s),respectivly,as determined fromgraded wire screen array analysis of the test atmosphere.For wire screen collection efficiencies0.8,the FT ratio was found to be insensitive to the screen and sampling parameters.With increasingcollection efficiency,the FT ratio was found to increase,up to a maxmium value of 0.86(±0.03)for collection efficiencies0.999.For the four screen types studied,the mean screen loss factor at alinear velocity of 21.1 cm/s was 1.04(±0.01).
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【References】
Chinese Journal Full-text Database 2 Hits
1 Guan Zujie Yu K N Cheung T KZhongshan University,Guangzhou,510275 City University of Hong Kong;SIMULTANEOUS MEASUREMENTS OF UNATTACHED FRACTION AND ACTIVITY MEDIAN DIAMETER OF PROGENIES IN DIFFERENT INDOOR AIR CONDITIONS[J];Radialization Protection;2001-02
2 GUAN Zujie(Zhongshan University, Guangzhou 510275)Yu K N ;Young E C M(City University of Hong Kong);A bronchial dosimeter with a single sampler[J];NUCLEAR TECHNIQUES;1998-12
【Co-references】
Chinese Journal Full-text Database 3 Hits
1 Guan Zujie(Zhongshan University,Guangzhou, 510275) Yu K N Young E C M(City University of Hong Kong);SIMULANT MEASUREMENT FOR THE TRACHEOBRONCHIAL REGION DOSE FROM EXPOSURE TO ENVIRONMENTAL RADON AND THORON PROGENIES[J];RADIALIZATION PROTECTION;1998-01
2 GUAN Zujie(Zhongshan University, Guangzhou 510275)Yu K N ;Young E C M(City University of Hong Kong);A bronchial dosimeter with a single sampler[J];NUCLEAR TECHNIQUES;1998-12
3 GUAN Zujie (Zhongshan University, guangzhou 510275) YU Junyue YANG Jianming (City University of Hong Kong);Measurement of radon and thoron concentrations in indoor airby using an active charcoal canister[J];NUCLEAR TECHNIQUES;1998-03
【Secondary References】
Chinese Journal Full-text Database 2 Hits
1 Guan Zujie Yu K N Cheung T KZhongshan University,Guangzhou,510275 City University of Hong Kong;SIMULTANEOUS MEASUREMENTS OF UNATTACHED FRACTION AND ACTIVITY MEDIAN DIAMETER OF PROGENIES IN DIFFERENT INDOOR AIR CONDITIONS[J];Radialization Protection;2001-02
2 XIAO Detao; ZHAO Guizhi; LING Qiu(Central-South Institute of Technology, Hengyang 421001);A radon discrimination method used by passive and integrating thoron monitoring technique[J];NUCLEAR TECHNIQUES;1999-07
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