As far as the tile roofs, they last a long time. It isn't the tile that is the issue, it's the felt (or paper) underneath that gets replaced. Mine is 25 years old, has not been replaced yet. Some neighbors have had theirs redone, but many have not as yet. 04-06-2011, 12:00 AM.
Smaller particle accelerators are used in a wide variety of applications, including particle therapy for oncological purposes, radioisotope production for medical diagnostics, ion implanters for manufacture of semiconductors, and accelerator mass spectrometers for measurements of rare isotopes such as radiocarbon.
Hospitals use particle. accelerator technology to treat thousands. of patients per year, with fewer side effects. than traditional treatments. Physicis ts have been inventing new types of accelerators. to propel charged particles to higher and higher energies. for more than 80 years. Today, scientists estimate that more. than 17,000 accelerators are in operation around the. worldâin industry, in hospitals and at research institutions.