RFID, EMP, and X-Ray... Oh Joy!

[Brutus]

Well, I'm no good at sappy hello's, so I'll just say this: I need your help.

 

See, I'm in the business of understanding things that interest me. As of now the intricacies of how a RFID chip works, and can be manipulated by an individual is one of them. To extenuate, I have no idea how when the receiver gets the signal it "reads" it, or what it does with those strew of lines dotting it. Also, how can Aluminum foil block radio frequency waves? Someone said that on this forum.

 

Second is how EMP works. What is it, how can it be controlled and built safely by an individual. What are its uses.

 

Third and last (as of now, can't overload y'all ) is how X-ray machines work in regards to how to hide objects in there. I know that the objects are colored three colors representing: metal, inorganic, and organic based off of density. However, I'm not sure how to hide a metal within another inconspicuous object.

 

All in stated no ulterior reasonings, I just like to know and feel that if something is "taboo" and shan't be known then... I can't even begin in the moral and intellectual depravity the society would have to accept.

 

Mind you I have a basic understanding of both RFID and X-Ray, but it is all self-taught so there are probably gaping holes of logic and I would LOVE any help in aiding me to understand.

 

EMP... I'm not so shabby on... yet!

 

Good night and stay classy.

[Mokele]

Third and last (as of now, can't overload y'all ) is how X-ray machines work in regards to how to hide objects in there. I know that the objects are colored three colors representing: metal, inorganic, and organic based off of density. However, I'm not sure how to hide a metal within another inconspicuous object.

 

Xrays don't actually 'color' anything - if you've seen images with color, the color has been added afterwards via image processing to make things prettier.

 

Basically, X-rays are absorbed by materials depending mostly on density. Air isn't very dense, so X-rays go right through. Fat is more dense, so absorbs more, water even denser, bone even more, and finally metal.

 

However, it's also about the *amount* of material. A friend of mine is currently doing an experiment on fish feeding using X-ray video, and the problem is that he can't feed them in a normal tank, because there's just too much water in the way of the beam, and so all the x-rays get absorbed. As a result, he has to make specially designed tanks with a very thin "feeding area" and train the fish to eat in there.

 

So basically, matter stops x-rays, and if you want to shield something, you either need a lot of matter (thick layer of water) or dense matter (thin layer of metal).

 

Mokele

[D H]

Also, how can Aluminum foil block radio frequency waves? Someone said that on this forum.

Without a reference, it's a bit hard to tell to what you are alluding. I suspect it's one of these devices:

 

 

Here's one in use:

 

[swansont]

X-rays are ionizing radiation, so atoms with lots of electrons and materials with a high density of atoms present more opportunities for absorption.

 

RF is much lower energy — it doesn't cause ionization. Materials that have resonances at the frequency of the radiation will absorb the RF, Also conductors; the free electrons can absorb the energy much like any antenna, which is why wrapping things in aluminum will tend to shield the radio waves.