Medical physics ocr a - Study guides, Class notes & Summaries

Why are X-rays used in medical imaging often referred to as ‘soft X-rays’? Because they have energies that are lower than gamma rays. How are X-rays produced? By rapidly accelerating or decelerating charged particles – their kinetic energy is transferred into highenergy photons How can you differentiate between X-rays and Gamma rays? X-rays and gamma rays have frequencies that overlap, so you cannot distinguish them by their wavelengths. Instead you have to use their method of prod...

How does the alpha-scattering experiment give evidence of a small, dense nucleus? A few alpha particles bounce back. This wouldn’t happen if the positive charge in the atom was distributed evenly throughout (as in the Plum Pudding Model), which suggests they must be hitting a dense positive charge. The fact it only happens to a very small number of alpha particles shows the nucleus must be small. What are the main constituents of an atom? ● Proton ● Neutron ● Electron How many ...

X-rays - correct answer Short wavelength electromagnetic waves, from 10^-8 to 10^-13m, used for medical imaging X-ray tube - correct answer a piece of equipment that produces X-ray photons by firing electrons from a heated cathode across a large p.d. in an evacuated tube - X-ray photons are produced when the electrons are decelerated by hitting the target metal of the anode. thermionic emission - correct answer ...

Define Magnetic Field. A region of space in which moving charged particles are subject to a magnetic force. This force is caused by the interaction of two Magnetic Fields (there is a field around the moving charged particles which interacts with the existing Magnetic Field they are passing through). Define Magnetic Field Line. The path which a north pole would take when placed in a Magnetic Field. Field lines go from north to south. How can you map field lines around a magnet? You can p...

1. What provides the energy of the X-rays in an X-ray tube? - AnsThe kinetic energy of the accelerated electrons. 2. What is an X-ray? - AnsA photon produced by the deceleration of a fast-moving electron 3. What is the typical p.d. of an X-ray tube for medical imaging? - Ans30-100kV 4. What causes the emission of electrons from the cathode in an X-ray tube? - AnsIt is heated to produce thermionic emission. 5. What name is given to the anode in an X-ray tube? - AnsThe target metal. 6. Wh...

Detailed and concise notes taken from the official textbook that summarise the entire module. Written and used by 4xA* A Level student (2023 cohort).

Medical Imagine A-level physics OCR A notes done for revision which summarises everything.

Module 6 - 'Particles and Medical Physics' - Radioactivity - Fission and Fusion - Einstein's Mass Energy Equation A-Level OCR Physics A

A summary of Module 6: Particles and Medical Physics of the OCR AS/A-Level Physics A (H156/H556) course. Comprehensive set of notes made throughout the teaching/learning, re-learning, revision and exam periods of the course. After revisiting this part of the course and devising these notes, this student went from a D-grade at the end of Year 12 to a final A-grade in the A-level.