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(News.com.au)   News: FBI arrests two men for plotting to kill Obama. Fark: With a death ray   (news.com.au) divider line 7
    More: Followup, FBI, Obama, death rays, material support, x-ray machines, pairs  
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2894 clicks; posted to Main » on 20 Jun 2013 at 9:17 AM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2013-06-20 01:17:44 PM  
1 votes:

Christian Bale: From 1953 to 1976, beams of microwaves of 2.5 to 4.0 GHz were aimed at the US embassy building in Moscow.

The U.S.S.R. used a death ray for decades and no one died.


Microwaves != X-rays.

Plus, the intent there seems to have been eavesdropping.  It had been done on lower frequencies (330 MHz or so) until the 'bug' was discovered by the US in 1952.  The next logical step would have been to build one that operated on much higher frequencies.
2013-06-20 09:51:42 AM  
1 votes:

unchellmatt: Uhhh.... I'm not going to proclaim myself an expert on the subject, but I do have a bit of an understanding on how x-rays and x-ray machines work. Anyone an engineer or professional physicist who could correct me on this, but wouldn't the amount of energy required to cause such a massive, wide area burst of x-rays be rather... unwieldy? I mean, sure you could build something that would put out a lethal amount of x-rays in rather narrow band for a few meters, but in order to have something you could put in the middle of a street somewhere, fire it, and have it give off enough radiation to cause any sort of damage in anything like a respectable radius, that's going to require an awful lot of power.


Just off the cuff here, but if you wanted to produce 60-keV X-rays, at 1% efficiency, you'd need 10^16 electrons to produce a Joule of energy. One of the articles about this claimed they could produce a dose of 10 Gy, which would be 10 J/kg, so even if I only wanted to irradiate 10 kg of evil Muslim flesh, that's now like 10^18 electrons, and since I have to worry about attenuation in air (let's say 20% for 10 m), that's 10^19 electrons. If I want to do it in a second, I need on the order of an Amp of current and a 60-kW power supply (that's going to dump most of the energy to heat). If I'm willing to accept longer irradiation times, I can use a lower current and smaller power supply. So it's not crazily undoable, but I don't see some Kluxers (who can barely manage to light a cross without igniting their robes) pulling it off.
2013-06-20 09:50:18 AM  
1 votes:

DubtodaIll: utah dude: unchellmatt: Uhhh.... I'm not going to proclaim myself an expert on the subject, but I do have a bit of an understanding on how x-rays and x-ray machines work. Anyone an engineer or professional physicist who could correct me on this, but wouldn't the amount of energy required to cause such a massive, wide area burst of x-rays be rather... unwieldy? I mean, sure you could build something that would put out a lethal amount of x-rays in rather narrow band for a few meters, but in order to have something you could put in the middle of a street somewhere, fire it, and have it give off enough radiation to cause any sort of damage in anything like a respectable radius, that's going to require an awful lot of power.

maybe you could manifold a bunch of straight x-ray tubes along a resonant cavity with an open end and create a maser?

Seems like you could just get a standard X-Ray machine, or a couple, and just up the power input.  Would that work?


From what that article said, they intended to park it somewhere, have it on a switch, and attempt to expose people nearby. That would require more than just a power outlet....

I'm reading up on it right now (don't know much about x-ray tube power requirements, I admit, and this IS out of my league), but from what I'm reading it would seem you'd need a rather sizable amount of power to pull off being able to expose people outside of, say, 3 meter radius. And even then, a simple pickup truck wouldn't be able to carry all the hardware. A big U-Haul maybe? But then the generators needed....
2013-06-20 09:33:37 AM  
1 votes:
Isn't this a repeat from yesterday?
2013-06-20 09:31:23 AM  
1 votes:
Uhhh.... I'm not going to proclaim myself an expert on the subject, but I do have a bit of an understanding on how x-rays and x-ray machines work. Anyone an engineer or professional physicist who could correct me on this, but wouldn't the amount of energy required to cause such a massive, wide area burst of x-rays be rather... unwieldy? I mean, sure you could build something that would put out a lethal amount of x-rays in rather narrow band for a few meters, but in order to have something you could put in the middle of a street somewhere, fire it, and have it give off enough radiation to cause any sort of damage in anything like a respectable radius, that's going to require an awful lot of power.
2013-06-20 09:24:41 AM  
1 votes:
Another case on non-terrorism, in which the non-terrorists will likely be convicted of terrorism and spend the rest of their lives in prison. According to this account, the FBI provided equipment that the guys with equipment that the weren't able to get, and without which the "death ray" could not be built (IOW, there was no threat and zero chance of a terrorist attack [altho, assassinating a politician isn't really terrorism] without the FBI's involvement). So, why aren't the FBI agents facing life in prison? Put me on the jury of these guys' trial and my vote is "not guilty."
2013-06-20 09:19:56 AM  
1 votes:
It's a brand new day and the birds are singing that you're gonna die.
 
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