en caesium 137 (n)
― IsA ⟶
Weight: 1.0
en beta emitter (n) Source: OpenCyc 2012
en beta emitter (n)
― IsA ⟶
Weight: 1.0
en radioactive isotope (n) Source: OpenCyc 2012
en unprocessed uranium (n)
― IsA ⟶
Weight: 1.0
en beta emitter (n) Source: OpenCyc 2012