Condition is related to Critical. Critical is a synonym of Significant. Significant is a synonym of Substantial. Substantial is a synonym of Solid. 
you are likely to find Radiation in/at/on Space. Space is related to Office. Office can be used for Working. 
Condition <--RelatedTo--> Critical <--Synonym--> Significant <--Synonym--> Substantial <--Synonym--> Solid 
Radiation --AtLocation--> Space <--RelatedTo--> Office --UsedFor--> Working 