Radiological data such as ambient dose equivalent rate obtained from radiation monitoring in Metro Manila are useful for the detection of any anomalous increase of radiation dose rate levels due to nuclear or radiological emergencies. In this study, ambient dose equivalent rates were measured in different locations in Metro Manila using a portable NaI(Tl) scintillation survey meter to determine the background radiation levels within the capital. Ambient dose equivalent rates measured range from 32.7 ± 2.2 to 59.3 ± 8.7 nanosieverts per hour (nSv/h) with computed mean and median values of 41.7 and 39.6 nSv/h, respectively. These values were lower than the Philippines’ average dose rate which is 52 nanograys per hour (nGy/h). No significant trend was also observed in the monthly variation of ambient dose equivalent rate for most locations, with the dose rates being relatively consistent throughout a year. No significant trend was further observed in the monthly variation of ambient dose equivalent rate for the whole Metro Manila. Data obtained in this study were used to develop a dose rate distribution map of Metro Manila which could be used as a baseline reference of emergency responders for environmental radioactivity monitoring during nuclear or radiological emergencies that may affect Metro Manila.

中文翻译：

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使用便携式NaI（TI）闪烁测量仪在菲律宾马尼拉大都会测量环境伽马剂量率。

辐射数据，例如从马尼拉大都会的辐射监测获得的环境剂量当量率，可用于检测由于核或放射紧急情况引起的辐射剂量率水平的任何异常增加。在这项研究中，使用便携式NaI（Tl）闪烁测量仪在马尼拉大都会的不同位置测量了环境剂量当量率，以确定首都内的背景辐射水平。测得的环境剂量当量率范围为每小时32.7±2.2至59.3±8.7纳西弗特（nSv / h），计算得出的平均值和中位数分别为41.7和39.6 nSv / h。这些值低于菲律宾的平均剂量率，即每小时52纳格雷（nGy / h）。在大多数地区，环境剂量当量率的每月变化也没有观察到明显的趋势，全年的剂量率相对稳定。整个马尼拉大都会的环境剂量当量率的每月变化没有进一步的显着趋势。在这项研究中获得的数据被用于制定马尼拉大都会的剂量率分布图，该图可作为应急响应者的基线参考，用于在可能影响马尼拉大都会的核或放射紧急情况下进行环境放射性监测。