Annual Report - Water Supplies Department 2016 - 2017

| 水務署 | 二零一六至一七年年報 111 附件 Annexes - 丙部 . 輻射水平 Part C Radiological quality 一般事項 General Points • 自二零一二年八月起，水務署已按照世 界衞生組織在二零一一年制定的《飲用 水水質準則》（世衞 2011 ）來監測香港的 食水水質。 • 按照世衞建議，食水中的總α及總β活 度的輻射篩查水平分別為每公升 0.5 貝 可和每公升 1.0 貝可，當食水的放射性 活度低於篩查水平，便不需要對個別放 射性核素進行調查或詳細分析。 • 我們在濾水廠、分配網絡和公眾可達的 用戶水龍頭抽取食水樣本。 • 根據在這段期間抽取的食水樣本，食水 的輻射水平遠低於世衞 2011 建議總α 及總β活度的篩查水平，而且可安全飲 用。 • Since August 2012, we have been monitoring the quality of our drinking water supply according to the World Health Organization’s (WHO) Guidelines for Drinking-water Quality (2011). • Accord i ng to the recommendat i on of the WHO, the screening levels for radiation in drinking water are 0.5 Bq/L for gross alpha activity and 1.0 Bq/L for gross beta activity respectively, below which no further investigation or detailed analysis for specific radionuclides is required. • Samples were taken at water treatment works, connection points and publicly accessible consumer taps. • Based on water samples taken during this period, the radioactivity level of drinking water was well below the screening levels for gross alpha and gross beta activities r ecommended by t he WHO 2011 and was sa f e f o r consumption. 參數 Parameter 單位 Unit 監測數據 Monitoring Data (04/2016 03/2017) 世衞 2011 篩查水平 WHO 2011 Screening Level 低於篩查 水平 Below Screening Level 最低值 Minimum 最高值 Maximum 平均值 Average 總α活度 Gross alpha activity 貝可╱公升 Bq/L < 0.1 < 0.1 < 0.1 0.5 √ 總β活度 Gross beta activity 貝可╱公升 Bq/L < 0.2 < 0.2 < 0.2 1.0 √ 註釋： Note: (1) 以上是有關食水水質的摘要報告。 (1) This is a summary report on drinking water quality. (2) 各數值是根據水務署水質科學部現行品質保證指 (2) All values are compiled in accordance with requirements stipulated by the 引所訂的要求而編製。 current quality assurance protocol of the Water Science Division of WSD. (3) 總α及總β活度的報告值分別設定為相應世衞篩 (3) Reporting values for gross alpha and gross beta activities are set at 20% of 查水平的 20% 。 their respective WHO screening levels.