Does the flavour I'm after come across here? Or do people find themselves wondering why this could produce [Radiation]?

I think the flavour comes across once you read the whole card. I can see the [Radiation] test replaced by a small radioactive hazard sign. Likewize on Noxious Grove I can see a small Biohazard symbol and a lightning bolt like symbol on Lightning Prairie. Not sure on the others yet - maybe a cog wheel for Steam and an inward spiral for torque???. Not saying the symbols SHOULD be there, just that they are how I interpret them.

Heh, thanks for the thoughts. I've been on the fence as to whether to provide symbols or not. If I do, then [Steam] will be a puff of steam/cloud/smoke, and [Torque] will either be an arrow going in a circle, or a cogwheel. [Radiation], though, I'd rather not be the radioactive hazard symbol, for two reasons: 1) it's meant to encompass beams of visible light as well, as on (((Minister of Illumination))), and 2) the second or third set will introduce power type [Atomic] :)

(I'm planning to make it easier to talk about the power types too. For the moment, if you write [Radiation] it appears as "Radiation"; you have to put a backslash before it to have it come out with the square brackets, like this: \[Radiation] -> [Radiation].)

Has the card changed? The flavour seems good to me now.

I'm not sure about symbols. The symbols would be so flavourful I really want them, but may not be as intuitive when you first see it. Probably wait to see how the mechanic evolves. One possibility would be to say "Add ☢ to your radiation pool". Then your squeeze in the symbol and the name, and if they're always matched, I don't think there's an extra cognitive load, I think people will instinctively assume they all act like the mana pool.

(I think there's a dramatic laser-warning sign that would do for all sorts of radiation, but it doesn't seem to be the default one.)

Jack: What I was worried about flavour-wise, but not wanting to prejudice by mentioning in the initial question, was whether "Contaminated" evokes "biochemical/poisonous contamination" rather than "irradiated".

Nice thought on how to keep symbols and names, but five (or six or seven) new pools feels somehow worse than one new pool that can have five/six/seven different things in it. It's still an idea I'll bear in mind.