Nuclear numbercrunching

Yield of each nuclear power's first test (source).

Test (nation)	Yield
Gerboise Bleue (France)	60 kilotonnes
Hurricane (UK)	25 kilotonnes
596 (PRC)	22 kilotonnes
Joe 1 (USSR)	22 kilotonnes
Trinity (USA)	19 kilotonnes
Smiling Buddha (India)	12 kilotonnes
Chagai-I (Pakistan)	9 kilotonnes
(North Korea)	<1 kilotonne

My conclusion?

Be vewy vewy afwaid

Seriously? Blue Gerbil?!? Smiling Buddha?!?