P3 AQA GCSE- Medical applications of physics (notes paraphrased from AQA Physics Revision Guide by Nelson Thomas) 3.0 / 5 based on 1 rating ? SciencePhysicsGCSEAQA Created by: NinaCreated on: 04-04-13 11:52 X-rays X-rays Part of the electromagnetic spectrum; high frequency and short wavelength Properties include: absorbed by metal/bone transmitted by healthy tissue similar affect to photos as light They're used to form images of bones to show fractures or dental problems CCDs can be used as electronic images or X-rays CT scanners use X-rays to produce digital images of a cross-section in the body. X-rays cause ionisation and may damage living tissue X-rays can be used for therapy e.g. treating cancerous tumours 1 of 2 Ultrasound Ultrasound Sound waves with a higher frequency than 20,000 Hz are called ultrasound waves Ultrasound waves are partly reflected between two materials e.g. body tissue Distance travelled by an ultrasound pulse can be calculated: S (distance, m) =V (Speed, m/s) * T (time, s) It cxan be used in medicene for scanning- non-ionising and so is safer than X-rays 2 of 2
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