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Very heavy particles if you can project them in a stream

Which would make everything behind the rocket radioactive.

When I was an undergrad we did a modern physics experiment. We put silver samples (old dimes if I remember correctly) next to a neutron source (Americium-241). After the silver had cooked for several minutes, we ran them over to our Geiger counters to measure the radioactive decay. Literally ran: the half-life of the produced isotopes was measured in seconds. I took the following lessons from this experiment:

1. Radioactive decay does follow an inverse exponential curve, just like they taught us in class.
2. Neutron sources make other things radioactive, and thus have to be heavily shielded.

Even if, hypothetically, you could make your proposed neutron stream, it’s a really bad idea.

Regards,

- HCF
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