[familyop]

"I have a couple of packs to provide about 3 days of protection for my family."

Very good. The I-type radiation will decay out quite a bit within about 72 hours. The more long lasting stuff (e.g., cesium, IIRC) tends to be much less dangerous (the far less potent radioactive stuff, in essence). The other measures you mentioned are good, although a few feet of earth (for one material) as a barrier would be good, too. There are also other materials.

[driftdiver]

Where I live a dirty bomb, spill, or meltdown is the highest possibility. I’m not too close to a potential nuclear target.