http://www.theage.com.au/articles/2003/04/19/1050172788288.html
April 19 2003
A mobile phone that will be able to tell the difference between a
"dirty bomb" and someone who's undergone radiation treatment is
among the next generation of anti-terrorism tools being worked on
by national weapons lab scientists.
The device, known as RadNet, is designed to make calls, surf the
web, act as a personal digital assistant (PDA), pinpoint locations
with Global Positioning System (GPS) technology and sniff out
radioactive materials with a cutting-edge sensor. It is one of
several national security projects under development at Lawrence
Livermore National Laboratory.
"It almost sounds like science fiction, but it's here today," said
Simon Labov, director of the new Radiation Detection Centre at
Lawrence Livermore, which celebrated its formal opening yesterday
with a display of the RadNet and other devices.
Lab officials showed off their work with theatrical flair, whipping
away white cloths from some prototypes.
"This is called UltraSpec," Labov said as he displayed the
Ultra-High Resolution Gamma Ray and Neutron Spectrometers. "No
other instrument like it in the world."
The Ultra-Spec uses extremely low temperatures - within 1 degree of
absolute zero (minus 273 degrees celsius) - to detect gamma rays
emitted by radioactive materials. It works by recording, very
precisely, the rise in temperature when a single gamma ray hits the
detector's superconducting material, which is usually tin.
"At these low temperatures we get incredible sensitivity," Labov
said.
Much of the technology on display yesterday uses gamma ray
detection because gamma rays travel farther and are easier to
identify than other tiny particles emitted by nuclear material,
Labov said. Radioactive substances also emit neutrons, which are
detected by other sensor technology.
Scientists hope to have RadNet prototypes ready for testing within
a few months and could have the devices ready for action in about
two years.
"It almost sounds like science fiction, but it's here today." -
Radiation Detection Centre director Simon Labov.
- AP
