Monday, February 9, 2009

Is Radon gas in your home? 您家有氡氣嗎?

Radon is a colourless, odourless, radioactive gas that occurs naturally in the environment. It comes from the natural breakdown of uranium in soils and rocks. The Maclean's magazine reports 2,000 Canadian die from radon exposure in their home. (click on the photo)

The Health Canada plans to spend almost $1 million testing 18,000 randomly chosen homes to make a "radon potential map". In 2007, we had protocols done by the BC Centre for Disease Control. A BC radon map was made (see map).

Please don't panic, average only 2.5% households contain "unsafe" levels (more than 200 becquerels per cubic metre). The Richmond houses are far away from the affected BC interior area. No smoking! and keep good ventilation in your home.

氡氣是無色無臭的放射性氣體,由泥土及岩石中微量的鈾自然分解出來。室內的氡氣來自地基裂縫、建築用石材及食水。是主要環境致癌物質之一,也是吸菸以外引發肺癌的第二大殺手。每年有2000加人致死原因與家中含放射性元素有關。

聯邦衛生局將動用一百萬元為一萬八千家庭測試氡氣含量,並會繪畫氡氣分佈圖。2007年卑斯省已完成試驗製成分佈圖(見附圖)。從圖中所見,列治文市並不在 200 becquerels per cubic metre 高危範圍內,請勿吸菸!並保持室內空氣清新即可確保健康。

Related web:
http://www.radonaware.ca/
Radon: Truth vs. myth
Radon: Risk and Reality
BC Centre for Disease Control (BCCDC)
Canadian Centre for Occupational Health and Safety
Health Canada
US Environmental Protection Agency
WHO International Radon Project
WHO Handbook on Indoor Radon (September 2009)
世卫组织 - 氡与癌症
The Radon Information Center
January - National Radon Action Month 氡氣行動月