The output of these devices is modified by manually adjusting the jaws, and then fine-tuning the leaves of the multileaf collimator in a process called field shaping. Images from a CT scan are used to position and configure these devices in a high-precision technique called IMRT. The output of these devices is measured in monitor units. Four people were killed by a software race condition that caused a plate to be incorrectly moved out of the path of one of these devices called the Therac-25. The Klystron Gallery sits atop a large-scale one of these devices that consists of a series of RF cavities surrounding a vacuum pipe. Along with a facility at Brookhaven, one of these devices was used to discover the J/psi meson (“MEE-zon”). For 10 points, radiotherapy produces X-rays with what devices that use alternating electric fields along a straight path to speed up beams of particles? ■END■
ANSWER: linear accelerators [or linacs; accept Varian Clinac; accept Stanford Linear Accelerator Center; prompt on particle accelerators or medical accelerators; prompt on SLAC (“slack”) National Accelerator Laboratory; prompt on descriptions of devices used in radiotherapy or radiation therapy until “radiotherapy” is read; prompt on X-ray generators or descriptions of devices that generate X-rays until “X-rays” is read; prompt on X-ray beams or radiation beams until “beams” is read by asking “what devices are used to generate the beams?”; reject “generators”] (IMRT is Intensity-Modulated Radiation Therapy.)
<Physics>
= Average correct buzz position