Scotch tape's surprising power: X-rays

[Raineyrocks]

http://www.cnn.com/2008/TECH/science/10/22/scotch.tape.xray/index.html

updated 2:59 p.m. EDT, Wed October 22, 2008

Scotch tape's surprising power: X-rays


NEW YORK (AP) -- Just two weeks after a Nobel Prize highlighted theoretical work on subatomic particles, physicists are announcing a startling discovery about a much more familiar form of matter: Scotch tape.
You're probably safe from X-rays -- none are produced by the tape in the presence of air, researchers say.

You're probably safe from X-rays -- none are produced by the tape in the presence of air, researchers say.

It turns out that if you peel the popular adhesive tape off its roll in a vacuum chamber, it emits X-rays. The researchers even made an X-ray image of one of their fingers.

Who knew? Actually, more than 50 years ago, some Russian scientists reported evidence of X-rays from peeling sticky tape off glass. But the new work demonstrates that you can get a lot of X-rays, a study co-author says.

"We were very surprised," said Juan Escobar. "The power you could get from just peeling tape was enormous."

Escobar, a graduate student at the University of California, Los Angeles, California, reports the work with UCLA colleagues in Thursday's issue of the journal Nature.

He suggests that with some refinements, the process might be harnessed for making inexpensive X-ray machines for paramedics or for places where electricity is expensive or hard to get. After all, you could peel tape or do something similar in such machines with just human power, like cranking.

The researchers and UCLA have applied for a patent covering such devices.

In the new work, a machine peeled ordinary Scotch tape off a roll in a vacuum chamber at about 1.2 inches per second. Rapid pulses of X-rays, each about a billionth of a second long, emerged from very close to where the tape was coming off the roll.

That's where electrons jumped from the roll to the sticky underside of the tape that was being pulled away, a journey of about two-thousandths of an inch, Escobar said. When those electrons struck the sticky side they slowed down, and that slowing made them emit X-rays.

So is this a health hazard for unsuspecting tape-peelers?

Escobar noted that no X-rays are produced in the presence of air. You need to work in a vacuum -- not exactly an everyday situation.

"If you're going to peel tape in a vacuum, you should be extra careful," he said. But "I will continue to use Scotch tape during my daily life, and I think it's safe to do it in your office. No guarantees."

James Hevezi, who chairs the American College of Radiology's Commission on Medical Physics, said the notion of developing an X-ray machine from the new finding was "a very interesting idea, and I think it should be carried further in research."
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[Coconut]

wtf. I chew on scotch tape all the time.

Jinkies. It's a clue.

[K. Darien Freeheart]

I was going to comment about the fact that someone was peeling tape in a vacuum, then Nick comes along and posts that...

If my mind could be blown twice in one day, it would have been. 

[Raineyrocks]

wtf. I chew on scotch tape all the time.

Jinkies. It's a clue.

I was going to comment about the fact that someone was peeling tape in a vacuum, then Nick comes along and posts that...

If my mind could be blown twice in one day, it would have been. 

[warren Smith]

It is not really surprising at all if you think about it.  Scotch tape is the easiest way to create positive/negative voltage fields simultaneously.  A few months ago I made this under $10 voltage detector and was messing around with scotch tape.  Its pretty interesting to see just how full of voltage the whole world around you is.  I got the instructions here:
http://amasci.com/emotor/chargdet.html
if anyone else is bored and has ten dollars to spend (it may have been more in total i didn't keep receipts but I think the 9volt battery was the most expensive component)

[dalebert]

I guess electricity is a bit like heat. It's something our bodies actually use and need, and certain amounts are trivial, but too much of it is actually quite harmful.

[warren Smith]

replace "trivial" with "necessary" and i think you nailed it