Measuring X-Ray Dosage with an Integrator

In an instrument developed at the University of California's San Francisco Medical Center, a parallel-plate ionization chamber produces a current as low as 10-13 A, which is integrated to obtain real-time measurement of total radiation dosage during radiotherapy procedures. Readout is on a digital panel meter, and a comparator compares the actual dosage with a preset dosage level, turning off the radiation when they have become equal. Read full article