Samples were collected for several weeks to determine the evolution of the ¹³¹I (Iodine-131) activity concentration in the inflow water processed at the Salitre wastewater treatment plant (WWTP) in Bogota, Colombia, derived from medical facilities for thyroid cancer diagnosis and treatment. Mass balances on ¹³¹I were performed based on the activity rates at the main inflow and outflow of the plant. The ¹³¹I activity concentration in the raw water stream was observed to increase significantly from Monday onwards throughout the week, while the daily activity concentration was highest in the morning and then continuously decreased over the rest of the day. The ¹³¹I activity concentration in the raw water exceeds the reference value for drinking water and is very close to the discharge limit in water bodies in Colombia. A mass balance calculation showed that the activity rate for the inflow and outflow waters of the WWTP is about 15% of the authorized activity to use for facilities discharging water into the basins and the use of bio-sludge stream for organic fertilizer production does not represent a significant risk of external irradiation for the population. The results of this work are the first of its kind in Colombia, which ones contribute significantly to determinate the radiological risk to public health due to utilization of treated water and sludge, know the ¹³¹I behavior in the city sewage systems, and give information for the performance review of regulatory control on ¹³¹I management in the country.

收集了数周的样品，以确定在哥伦比亚波哥大的Salitre废水处理厂（WWTP）处理的流入水中¹³¹ I（Iodine-131）活性浓度的演变情况，该工厂来自于甲状腺癌诊断和治疗的医疗机构。基于工厂主要流入和流出处的活动率对¹³¹ I进行质量平衡。从周一开始，整个星期中原水流中的¹³¹ I活性浓度显着增加，而早晨的每日活性浓度最高，然后在一天的其余时间中持续降低。在¹³¹我的原水中的活度浓度超过了饮用水的参考值，并且非常接近哥伦比亚水体的排放限值。质量平衡计算表明，污水处理厂的进水和出水活动率约为授权活动的15％，该活动用于将水排放到流域的设施，而使用生物污泥流生产有机肥料并不代表人群受到外部辐射的风险很大。这项工作的结果在哥伦比亚尚属首次，该工作对确定由于利用经处理的水和污泥而对公共健康造成的放射风险做出了重大贡献，知道¹³¹我在城市下水道系统中行为，并为该国¹³¹ I管理的监管控制的绩效审查提供信息。