Robuta

https://scirp.org/journal/paperinformation?paperid=77577
Assessing natural radioactivity in marine sands offshore China. Findings show safe construction potential and correlation between 226Ra and 40K concentrations....
natural radioactivitymarine sandevaluationdepositsoffshore
https://www.mdpi.com/1660-4601/21/3/315
This article reports the results of an investigation into the activity concentration of natural radionuclides in raw building materials for underground parking...
natural radioactivitybuilding materialsunderground parkingrawlots