Decommissioning of nuclear power plants is a multistage process involving complex operations like radiological characterization, decontamination and dismantling of plant equipment, demolition of structures, and processing and disposal of waste. Radioactive effluents released into the environment may result in exposure of population through various exposure pathways. The present study estimates the public dose due to atmospheric discharge of important radionuclides during proposed decommissioning activities of Indian Pressurized Heavy Water Reactors. This study shows that major dose contributing radionuclides are ⁶⁰Co followed by ⁹⁴Nb, ¹³⁴Cs, ¹⁵⁴Eu, ¹⁵²Eu, ¹³³Ba, ⁹⁹Tc, ⁹³Mo and ⁴¹Ca. It is found that infant dose is higher than adult dose and major fraction of total dose (~98%) is through ground shine and ingestion; other pathways such as inhalation and plume shine contribute only a small fraction. This study will be helpful in carrying out radiological impact assessment for decommissioning operations which is an important regulatory requirement.

中文翻译：

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核电厂退役中长寿命放射性核素大气排放的剂量评估。

核电厂的退役是一个多阶段过程，涉及复杂的操作，例如放射学表征，工厂设备的去污染和拆卸，结构的拆除以及废物的处理和处置。释放到环境中的放射性废水可能导致人口通过各种暴露途径暴露。本研究估计了印度加压重水反应堆拟议的退役活动期间由于大气中重要放射性核素的排放而产生的公共剂量。这项研究表明，贡献最大剂量的放射性核素是⁶⁰ Co，然后是⁹⁴ Nb，¹³⁴ Cs，¹⁵⁴ Eu，¹⁵² Eu，¹³³ Ba，^99。TC，⁹³ Mo和⁴¹的Ca. 发现婴儿剂量高于成人剂量，总剂量的主要部分（〜98％）是通过地面照射和摄食而引起的。其他途径（如吸入和羽状闪耀）仅占很小的比例。这项研究将有助于对退役作业进行放射学影响评估，这是一项重要的法规要求。