Concentrated Hydroflouric acid, and even pure fluorine gas however? That can be an easy turn of a tap away at most semiconductor plants. And much worse. And if you know anything about Florine, ‘much worse’ should be pretty chilling.
I’m honestly not sure if radiation poisoning (actually quite hard and rare to die from) is worse than dying from fluorine exposure (I’m sure it’s killed a lot more people than radiation), but fluorine is certainly going to be faster.
Most fire departments are going to be a lot more concerned about a semiconductor plant than a nuclear one.