X 光 可唔可以穿過石紙??

1. x-ray is highly energetic eletromagnetic radiation. x-ray photons interact in different fashion at different energy range.

2. the airport x-ray scanner would of course have sufficient energy to penetrate thick objects, e.g. a 30x30x30cm suitcase.

3. foil of course cannot stop x-ray photons. a) too thin and b) foil is made of aluminium. the probability of a x-ray photon being absorbed at interaction at this imaging energy range (120 - 160 keV) increses with the atomic number of the interaction material .

4. you can make your suitcase with a few mm thick lead, and you're guaranteed that the security won't be able to see anything from the screen because all x-ray photons will be absorbed, i.e. the screen will just display a black box. but then your suitcase will be VERY heavy and you might get arrested for setting up a hoax :)

沒有聽過郵局有用石做的紙

x-光是否能穿過物體,也要視乎x-光的強度,物體的厚度.
如果x-光夠強,物體夠薄的話, 是有可能穿透的