Bronchial Rn dose survey for residences.
The bronchial dosimeter for Rn progeny proposed by Yu and Guan in 1998 was employed to survey the bronchial dose from Rn progeny in 30 residences in Hong Kong. An average bronchial deposition fraction of Rn progeny was obtained as 0.0334, which gave an average dose conversion factor (DCF) of 8.5 mSv WLM-1. The mean values of potential alpha energy concentration (PAEC) deposited in the tracheobronchial region (PAECT-B), total PAEC in air (PAECT), annual effective dose (E), concentration of Rn gas (RC) and annual dose conversion factor (ADCF) for all the residential sites combined were 0.11 +/- 0.05, 3.1 +/- 1.4 mWL, 1.2 +/- 0.5 mSv yr-1, 23 +/- 10 Bq m-3 and 0.055 +/- 0.020 (mSv yr-1 per Bqm-3), respectively, with air-conditioned sites (AC sites) and non-AC sites having significantly different mean ADCF values. The indoor relative humidity affected PAECT and RC with high confidence levels (> 95%).
Yu
K N
KN
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong. peter.yu@cityu.edu.hk
Lau
B M
BM
Guan
Z J
ZJ
Lo
T Y
TY
Young
E C
EC
D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis; D001980:Bronchi / Q000737:chemistry; D006723:Hong Kong; D006798:Housing; D006801:Humans; D006813:Humidity; D008962:Models, Theoretical; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation; D017687:Radon Daughters / Q000032:analysis*; D018709:Statistics, Nonparametric; D014691:Ventilation
D000396:Air Pollutants, Radioactive; D017687:Radon Daughters