No. 16,063 in Russian
радиоактивный
"Radioactive" – emitting radiation as a result of nuclear decay.
In a sentence
Этот район объявлен радиоактивным и опасным для жизни.
This area has been declared radioactive and hazardous to life.
In this sentence, 'радиоактивный' is used as an adjective to describe the present condition of an area as having radioactive properties.
Научный эксперимент показал радиоактивные материалы, образующиеся в процессе деления.
The scientific experiment revealed radioactive materials formed during the fission process.
Here, 'радиоактивный' qualifies 'материалы' to indicate the nature of the substances involved in the experiment.
Она предупредила меня, что старые часы могут быть радиоактивными.
She warned me that old clocks might be radioactive.
In this example, 'радиоактивный' is used to apply a possible radioactive characteristic to the 'часы' being discussed.
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