| 21. | The treatment head of a linear accelerator consists of both a primary and secondary collimator.
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| 22. | The first medical linear accelerator was used at the Hammersmith Hospital in London in 1953.
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| 23. | Stanford Linear Accelerator Center : http : / / www . slac . stanford . edu
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| 24. | In 1964, Johnston moved to the Stanford Linear Accelerator Center as head of the Electronics Department.
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| 25. | The down quark was first observed by experiments at the Stanford Linear Accelerator Center in 1968.
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| 26. | Modern plutonium bombs use a minuture linear accelerator and target material for the initial neutron burst.
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| 27. | The accelerator has been in use since 1975 and its acronym stands for universal linear accelerator.
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| 28. | He is a former director of the Stanford Linear Accelerator Center ( 1999 2007; SLAC ).
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| 29. | One is a $ 4 . 5 billion linear accelerator, which makes tritium with high-energy beams.
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| 30. | The up quark was first observed by experiments at the Stanford Linear Accelerator Center in 1968.
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