About: radioactive source

Premodifier: radioactive
Head noun: source

Same concepts
http://dbpedia.org/resource/Radioactive_decay

Broader concepts

label	provenance	confidence
radioactive material	isap:105761712	0.734792

Narrower concepts

label	provenance	confidence
plutonium	isap:136348424	0.463405
uranium	isap:271193865	0.446323
radium	isap:392033966	0.367742
seed	isap:309818749	0.303425
source	isap:389439752	0.222439