Finding F-1639

“In Case 1, after natural ventilation, radon concentration decreased from 134.73 Bq m−3 to 14.71 Bq m−3 in the living room and from 163.29 Bq m−3 to 10.83 Bq m−3 in the room, with high reduction rates of 89.08% and 93.37%, respectively.”

Choi et al. Comparison of Indoor Radon Reduction Effects Based on Apartment Housing Ventilation Methods. Atmosphere. Page 5. CKB 0456

Structure

Factor: Radon
Intervention: Natural ventilation
Setting: apartment, KR
Study design: measurement study of apartment ventilation and radon: indoor radon measured before and after natural ventilation and with a mechanical ventilation system, in the living room and in a further room of the same apartment (class 4)
Effect: difference
Caveat: a single apartment under one ventilation scenario, so the reduction is not a long-term average

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.