The Outer Limits or The Twilight Zone?

What was the name of the episode, and which show was it on,ok here
goes:

The government was testing loyalty of our officers and they wanted to
know who would betray them, well at the end, the woman scientist
dismantled all safety backups and detonated a cobalt bomb that
destroyed the planet, because she thought we were getting taken
over,when really it was a test all the time.