Radionuclide Contents in Building Materials Used in Hong Kong

Man, C.K.; Lau, Shun; Au, S. K.; Ng, Wai-Kwok

doi:10.1097/00004032-198909000-00004

Cited by 22 publications

(1 citation statement)

References 2 publications

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“…(1¡ 4) This is different from the situation in the United States and Europe where indoor radon accumulation comes from soil gas entry. (7¡ 9) If there are other radon transport routes such as radon entry from soil gas, or ow of radon gas from some high concentration zones into the control premises, the outdoor level C o can be modi ed to include the effect of these routes, or an additional term can be added to equation (1).…”

Section: Figurementioning

confidence: 99%

Study of Indoor Radon Levels in High-Rise Air-Conditioned Office Buildings

Chao¹

1999

Applied Occupational and Environmental Hygiene

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A series of measurements were conducted to study the indoor radon pollution in air-conditioned high-rise office buildings. Continuous monitoring of indoor radon levels in nine air-conditioned premises located in six office buildings in Hong Kong was conducted from August 1996 to February 1998. Each of the tests lasted for at least 48 hours. The measurement covered both day time monitoring while the air-conditioning was on and night time monitoring while the air-conditioning was off. The indoor radon level followed inversely the operation pattern of the mechanical ventilation systems in the buildings. During office hours when the mechanical ventilation was on, the indoor radon level decayed and after the mechanical ventilation was off during non-office hours, the radon level increased. The average indoor radon level during office hours on the nine premises varied from 87 Bq/m3 to 296 Bq/m3, and the indoor averaged radon levels over both day time and night time periods without mechanical ventilation were about 25 percent higher. The air infiltration rate and the radon emission characteristics from the building materials were estimated from the radon build-up curves which were observed after the mechanical ventilation was off. The radon decay curve observed after the mechanical ventilation system was turned on was used to calculate the total fresh air intake rate. Average radon emanation rates of the building materials in the six buildings varied from 0.0019 to 0.0033 Bq/m2s. It has been found that building infiltration rate accounted for about 10-30 percent of the total building ventilation rate in the buildings depending on building tightness.

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Section: Figurementioning

confidence: 99%

Study of Indoor Radon Levels in High-Rise Air-Conditioned Office Buildings

Chao¹

1999

Applied Occupational and Environmental Hygiene

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Radon and Health

Peramune¹,

Dissanayake²,

Thalangamaarachchige³

et al. 2023

Medical Geology

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Radioactivity contents in building materials used in Hong Kong

Man

Yeung

1998

J Radioanal Nucl Chem

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The radioactivity contents in building materials used in Hong Kong were measured to determine the sources of the high indoor radon concentrations observed in local buildings. The radium contents and the radon emanation coefficients of different building materials were measured by high resolution y-ray spectroscopy using germanium detectors. The radon exhalation rates were measured using scintillation cells by circulating the exhaled radon from building materials and obtaining the initial growth rates. The radium content and the radon exhalation rates of concrete and bricks used in Hong Kong were found to be higher than those in some other countries, resulting in high indoor radon concentrations probably due to the high radioactivity contents in the aggregates, granitic in nature, used in building materials.

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Radionuclide Contents in Building Materials Used in Hong Kong

Cited by 22 publications

References 2 publications

Study of Indoor Radon Levels in High-Rise Air-Conditioned Office Buildings

Study of Indoor Radon Levels in High-Rise Air-Conditioned Office Buildings

Radon and Health

Radioactivity contents in building materials used in Hong Kong

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