Plutonium stuffed animals

Wouldn't it be so relaxing to hug a nice warm stuffed animal that had some real mass to it? A soothing teddy bear that you could cuddle with on a cold night just like curling up to a real bear.

I'm sure the innovative folks in the weighted blanket industry have optimized the production tools for putting rocks in fabric. It would be so easy to pivot from sand to a proprietary mix of plutonium and lead beads. The final product would not be heavy per se, merely a reassuring heft to match the generated heat.

"Oh but the radiation!" you might say. Yes, that is the whole point. You would never need to rewarm or refill them. Your stuffed animal would always be pre-heated for you. Your bed could be warm forever.