1 / 32

Radiation and the Atom

Electromagnetic Radiation. Visible light, radio waves, x-raysNo mass; unaffected by electrical or magnetic fields; constant speed in a given mediumTravels in straight lines; trajectory can be altered by interaction with matterAbsorption removal of the radiationScattering change in trajectory

london
Télécharger la présentation

Radiation and the Atom

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Radiation and the Atom

    2. Electromagnetic Radiation Visible light, radio waves, x-rays No mass; unaffected by electrical or magnetic fields; constant speed in a given medium Travels in straight lines; trajectory can be altered by interaction with matter Absorption – removal of the radiation Scattering – change in trajectory

    4. EM Radiation in Imaging Gamma rays – originate within nuclei of radioactive atoms; used to image the distribution of radiopharmaceuticals X-rays – produced outside the nucleus; used in radiography and computed tomography Visible light – produced in detecting x- and gamma rays; used for observation and interpretation of images Radiofrequency EM in the FM region – used as the transmission and reception signal for MRI

    5. EM Wave Characteristics Waves characterized by amplitude, wavelength (?), frequency (?), and period Speed (c), wavelength, and frequency related by Wavelengths typically measured in nanometers (10-9 m); frequency expressed in hertz (Hz) (1 Hz = 1 cycle/sec = 1 sec-1)

More Related