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Originally Posted by Anthony
The problem with using it for a super tiny fusion weapon is that the explosive product is 2.5 MeV gamma rays
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Actually, my reading suggests that if I use niobium instead of hafnium, the emitted photons are only around 30.77 keV (7.44 EHz, 40.3 picometres), more in the hard x-ray range than gamma. (Still probably not all that easy to convert into fusion, though.)
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Of course, if you're just interested in destroying electronics, just expose it directly, you can wipe electronics with much less radiation than it takes to melt or vaporize the chips).
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Indeed; I came across an optional GURPS rule - I forget which edition - that a target with built-in physical contact with a carefully-placed explosive automatically takes full damage. Implying that a single gram of isomer-in-carrier-plastic would dump 32 rads straight onto whatever chip it was built into, before even counting explosive damage. Even rad-hardened chips have their limits.