Finding F-0634

“Approximately 60% (30/50) of the radon concentration values in the indoor air exceed the reference level of 300 Bq/m3.”

Silva Assessment of indoor radon concentration and time-series analysis of gamma dose rate in three thermal spas from Portugal (2022). Environmental monitoring and assessment. Page 6. CKB 8660

Structure

Factor: Radon
Population: spa workers and visitors
Setting: thermal spa, PT
Study design: long-term follow-up measurement of indoor radon and gamma dose rate in three Portuguese thermal spas (50 measurement values in air), following an earlier survey of 16 spas measured twice a year from 2012 to 2016 (class 4)
Effect: share-above 60
Caveat: share of measurement values, not of rooms or buildings

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.