Other powerful radioactive sources should be equally protected.
In 2003, he co-wrote an unclassified report titled "Commercial Radioactive Sources: Surveying the Security Risks".
This source of intelligence does not include energy emanating from nuclear detonations or radioactive sources.
Those radioactive sources are no longer in use, but they remain dangerous.
The encapsulated radioactive sources are inserted into the tumour via catheters or needles.
In both cases, radioactive sources are carefully threaded into the delivery device.
A European Union study estimated that about 70 radioactive sources are lost every year from regulatory control.
He also said the radioactive sources could have been mixed with conventional explosives to make a "dirty bomb".
During the refining process of these metals, orphaned radioactive sources are sometimes accidentally melted at the same time.
The radioactive sources included "a huge range of all types," including isotopes of the elements cobalt, cesium and strontium, Mr. Wilkes said.
There was a great deal of nuclear enthusiasm, and now loads of these big, hulking, nasty radioactive sources are scattered around all over.
