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Interpreting radon analysis results

Levels of radon in the facilities where gauging jars are placed are determined in a testing laboratory approved by the Finnish Radiation and Nuclear Safety Authority based on the results given by the gauging jars. These results are reliable, provided that the information provided is correct and that the gauging jars have been placed according to the instructions. Levels of radon in the tested facilities recorded during the gauging period in question are presented in the attached result sheet.
In case levels of radon exceed 400Bq/m3 

It is recommended that the property owner or housing association take immediate action to reduce the amount of hazardous radon gases. In such facilities, the levels of radon exceed the threshold value for indoor air set in a decree (944/92) by the Ministry of Social Affairs and Health.
Authorities must be notified in writing of radon concentrations exceeding 400Bq/m3 in places of work.
In case levels of radon exceed 300Bq/m3

The new European Council directive on protection against radiation will be implemented during 2018. The directive sets the threshold value for radon in the indoor air in apartments completed before 2004 as 300Bq/m3.  
In case levels of radon exceed 200Bq/m3

Levels of radon exceeding 200bq/m3 can be considered a construction defect in apartments completed in and after 2004, and therefore actions should be taken to reduce the amount of radon present in indoor air. The Finnish Radiation and Nuclear Safety Authority recommends practical and easily implemented measures for reducing radon concentrations in apartments completed prior to 2004.

In case levels of radon do not exceed 200Bq/m3

The Finnish Radiation and Nuclear Safety Authority considers apartments with an indoor air radon concentration lower than 200Bq/m3 safe in terms of radiation.  
The limits of error marked +/- next to the analysis result indicate the margin of error within which the factual result is most likely to be. All results typically have a margin of error due to slight inaccuracies related to different gauging and analysis methods. In a laboratory environment, the margin of error for analysing the results provided by radon gauging equipment is very narrow. The actual margin of error is typically much narrower than that stated in the results.     
Retesting for radon Radon testing should be reperformed when more than 5 years have passed since the previous testing, radon work has been carried out or changes have been made to the property’s ventilation system.

Health hazards caused by radon Indoor air with high levels of radon is always a risk factor for developing lung cancer. The higher the concentration and the longer the exposure, the greater the risk of developing cancer. The risk of developing lung cancer due to radon is much higher for smokers.  
Contact our customer service at +358 (0)10 323 1000 in case you have questions about radon analysis or if you would like to book our radon services. 

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