Will this also work as a faraday cage (cell phone signal blocker, key fobs, electomagnetic fields)?

No! There is a big difference between shielding needed to block EMF vs. ionizing radiation such as alpha, beta. gamma, x-ray radiation.

If I put my phone inside the case, would a scanner checking all layers detect my phone?

Hard to say, however going through security my bag was manually checked. I had the case, empty, in my bag. The inspector told me they couldn't see through the case. So anecdotal evidence only.

will this bag hold vitamin bottles

Available in three sizes: Mini FilmGuard - Holds nine 35mm film cassettes or a small camera: 5.25 x 8" (13 x 20cm) Small FilmGuard - Holds fifteen rolls of 35mm film or small camera with a few rolls: 9.5 x 8" (24 x 20cm) Large FilmGuard - Holds thirty-five rolls of 35mm film, or three 50-sheet boxes of 4x5" film, or small camera with a few rolls: 10.5 x 12" (27 x 31cm)

If thoriated glass camera lenses (e.g. Pentax Takumar) are placed in bag, will the bag stop the weak radioactivity emitted by the lenses?

Absolutely! The bag is rated to protect 470bq, so as long as the instrument you put into it is below that level, it should protect. It’s the same material used by NASA, Space X and even Jeff Bezos. I also know three people who use these bags instead of tin foil hats to protect the government from spying on their thoughts.

Material Type	Ballistic Nylon, Lead-Impregnated Vinyl Sheet
Item Weight	0.56 Pounds
Style	Protective
Pattern	Solid
Color	Black
Number of Compartments	1
Strap Type	Shoulder
Closure Type	Hook & Loop

Domke711-12B Filmguard Bag - Medium, Black

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