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Radioactive materials in wide used in the usa might be changed into capons of terror that will probably kill few people but would spread panic id produce severe economic damage, scientists told the Senate Foreign stations Committee today.



"imagine dragons" radioactive acoustic cover
The types of materials wouldn't produce nuclear explosions. Rather, they'd spread using conventional explosives in so-called dirty bombs. The scientists up testified at the committee's hearing today said such weapons were a textually serious problem.



"imagine dragons" radioactive acoustic cover
One of the most dangerous materials, they said, are bars radioactive cobalt (IS) accustomed to irradiate food, medical devices along with other products to sterilize ( $j if ) them.



If turned into fine particles dispersed underneath the right conditions, the cobalt could spread en radiation to push the abandonment of the area the size of Manhattan, the scientists said. But federal and industry officials said this action by using it.



radioactive cobalt was unlikely due to the intense radiation this agreement thi person trying to use the weapon will be exposed and since the information ii transported secretly and kept behind tons of lead along with other shielding while o$ the road or perhaps in use.



Other radioactive materials in tens of thousands of medical and industrial devices could possibly be used to make weapons that would leave wide areas will radiation levels above Environmental Protection Agency limits, possibly leaden| to temporary evacuation and an almost impossible cleanup.



Scientists at this hearing held to know these threats and also to devise means of protecting Americans against them declared they remained concerned that fissionable material - the fuel for nuclear weapons - as well as the expertise necessary to put it to use could be spreading from your former Ussr to terrorist networks, but presented no new evidence of such leakage.



Dr. Richard Me serve, chairman from the Nuclear Regulatory Commission declared these materials, plus the much more powerful cobalt rods used in sterilizing food, are tightly controlled. He was quoted saying the weaker sources, i dispersed, would cause almost immeasurably small increases in cancer rate among individuals who were exposed.



Nevertheless, that kind of attack might lead to long-term problems because techniques for dealing with radioactive contamination rely largely on destruction and removal, Dr. Henry Kelly president of the Federation of yank Scientists, said.



Because limits set b the Environmental Protection Agency for radiation exposure are so low, are? Might have to be evacuated in the future even though the risks air relatively slight, he was quoted saying. Nave cooled slightly before many years.



Which has been puzzling, because :he polar regions are usually more understanding of warming trends compared to the -east with the globe. A lot more puzzling, a little part of Antarctica - the peninsula that stretches north toward Latin america - defies the cooling rend. It has been warming quickly, about five degrees over the past 50 'ears, Ten times the world average.



Writing in the present publication of the journal Science, Dr. David Thompson, a professor of atmospheric science at Colorado State University, and Dr. Susan bloom, a senior scientist at the National Oceanic and Atmospheric administration in Boulder, Colo., argue that the ozone hole, which has penned up each spring over Antarctica lately, can help explain both introductory trends.



A vortex ($EM ) of winds continually blows around Antarctica, tending ) trap cold air at the South Pole. Within the new paper, Dr. Thompson and Dr. Dolman reveal that the winds have strengthened before few decades,eping the cold air a lot more confined. The peninsula, which lies outside of the ind vortex, escapes the cooling effect, the scientists said. They are saying the ozone) le may be the reason for the stronger winds.



Near to the ground, ozone, a molecule consisting of three oxygen atoms, rams a large and unhealthy element of smog. Full of the weather, waver, naturally occurring ozone is essential for life, blocking ultraviolet rays at would fatally mangle DNA. However, fewer ozone molecules mean s atmosphere absorbs less ultraviolet radiation. As opposed to warming air, the fs bounce off of the ice and snow of Antarctica and reflect back to space.



Scientists already knew that the ozone hole had cooled top of the no sphere. Dr. Thompson and Dr. Solomon show that the troposphere (%$ M), the best six miles from the atmosphere, in addition has cooled.



"It's a lot of as well as for thought in there," said Dr. John Walsh, a professor of atmospheric once in the University of Illinois and an author of a paper in Science in Mary that indicated Antarctica was cooling. He noted how the ozone hole s usually largest in November or December, but how the greatest cooling ended up about 6 months later.