Radiological risk assessment of naturally occurring radioactive materials in marine sediments and its application in industrialized coastal areas: Bay of Algeciras,Spain

Radioactivity levels in aquatic environments can be assessed through the study of superficial sediments. Anthropogenic activities may alter radioactivity levels leading to the anomalous accumulation of natural radionuclides in coastal areas. In this work, marine sediments from a significant area subjected to severe industrial development were collected in order to measure activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K by gamma spectrometry. Radium equivalent index (Ra_eq), absorbed gamma dose rate in air (D) and annual effective dose equivalent (H) were also calculated and used as risk assessment tools. Results showed low levels of radioactivity in marine sediments from the Bay of Algeciras, discarding any significant radiological risks. Furthermore, the obtained data set could be used as background levels for future research applications and development of environmental regulatory frameworks.