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T-ray Source Schematic  (Source: Argonne National Laboratory)
T-rays could improve medical diagnostics and airport security

Anyone who has flown on a commercial aircraft since 9/11 knows that the new security mechanisms that intend to keep us safe can be annoying as well. Few will argue that having to take off half your clothes just to get on an airplane might be considered excessive and time-consuming.

Earlier this month U.S. authorities participating in a TSA audit were able to smuggle components through checkpoints at major airports in the United States, even with alerted security measures. 

Scientists at the U.S. Department of Energy’s Argonne National Laboratory have developed a new source of so-called T-rays that could lead to a totally new method of detecting weapons in airports as well as new medical diagnostic devices that don’t harm cells and work better than current devices.

T-rays, or terahertz rays, function similarly to x-rays or any other electromagnetic radiation. However, whereas x-rays radiate at frequencies above the visible light spectrum, t-rays operate just below it. High-frequency t-rays is actually low-frequency infra-red radiation. 

T-ray devices can penetrate leather, fabric, cardboard and paper but can’t penetrate metals or water. T-rays can also penetrate the human body by about half a centimeter making it appropriate for diagnosing medical problems.  Most technology in airports today use some form of x-ray technology instead, which can be harmful to passengers if used incorrectly. 

The lead scientist on the project, Ulrich Welp of the Argonne Materials Science Division and his team of international researchers have been able to produce t-rays using superconducting crystals grown at the University of Tsukuba in Japan.

The crystals are arranged into what’s called Josephson junctions, which exhibit special properties when electrical voltage is applied. Voltage applied to the crystals causes an alternating current to flow back and forth across the junctions at a frequency proportional to the voltage. Researchers found that tiny voltages of around two millivolts per junction could produce frequencies in the terahertz range.

The trick to producing t-rays is to get the around 1,000 stacked Josephson junctions to oscillate at the same frequency. Welp said, “That's been the challenge all along. If one junction oscillates up while another junction oscillates down, they'll cancel each other out and you won't get anything.”

The researchers were able to achieve the same oscillation frequency of the junctions by shaping the superconducting crystals into resonant cavities. Currently the researchers are able to generate t-rays in the 0.4 to 0.85 terahertz range with a signal power of up to 0.5 microwatts.

Welp says, “The more power you have, the easier it is to adopt this technology for all sorts of applications. Our data indicate that the power stored in the resonant cavities is significantly larger than the detected values, though we need to improve the extraction efficiency. If we can get the signal strength up to 1 milliwatt, it will be a great success."

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RE: Surprise, surprise
By jtemplin on 11/29/2007 10:42:06 AM , Rating: 2
Typical civil rights response? Man I sure hate when people fight for don't it?

Which came first? Blacks being targeted by police or a disproportionate black prison population? The fact is you haven't proved the temporal sequence of this causal relationship you are suggesting. This relationship may well be spurious.

There is a "hidden figure" of crime rates. Much crime occurs without police ever knowing, and in fact where you look has a lot to do with what you find. Looking at incarceration rates can be especially misleading. Black men being convicted more frequently than white men does not prove that crime is being perpetrated more frequently by black men.

The police may very well be looking more closely at the black population, and arrest and convict them selectively. Realize that police resources ? true crime rate. There is not a 1:1 relationship between offending and apprehending, so you really have to look carefully at who and where is being policed, and not just assume the numbers tell the whole story. Buying into that so easily is a form of neo-racism. If you want to give neo-racist ideas a #5 rating people go right ahead. But there are some people who will not stand aside and let such ideas stand unchallenged.

RE: Surprise, surprise
By jtemplin on 11/29/2007 10:42:40 AM , Rating: 2
stupid browser...

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