Ionizing radiation Some kinds of ionising radiation can be detected in a cloud chambers.
Electromagnetic radiation (EMR) refers to energy that travels in the form of waves. Another way of thinking about EMR is as a matterless bundle of energy called a photon. The photon is the “package” of energy that carries the energy through space. Course Objectives • Understand the basic physics of the electromagnetic and particulate forms of ionizing radiation. • Understand the distinctions between the units of radiation quantity, exposure and dose. • Be familiar with some of the methods used to measure radiation dose. Ionizing Radiation A photon is a quantum of EM radiation. Its energy is given by E = hf and is related to the frequency f and wavelength λ of the radiation by.
General considerations Occurrence and importance Close to 0. All human life is immersed in it, and modern communications technology and medical services are particularly dependent on one or another of its forms.
In fact, all living things on Earth depend on the electromagnetic radiation received from the Sun and on the transformation of solar energy by photosynthesis into plant life or by biosynthesis into zooplanktonthe basic step in the food chain in oceans.
Green plants also have high sensitivity to the maximum intensity of solar electromagnetic radiation, which is absorbed by a substance called chlorophyll that is essential for plant growth via photosynthesis.
Practically all the fuels that modern society uses— gasoiland coal —are stored forms of energy received from the Sun as electromagnetic radiation millions of years ago. Only the energy from nuclear reactors does not originate from the Sun.
Everyday life is pervaded by artificially made electromagnetic radiation: Infrared waves also are given off and received by automatic self-focusing cameras that electronically measure and set the correct distance to the object to be photographed.
As soon as the Sun sets, incandescent or fluorescent lights are turned on to provide artificial illumination, and cities glow brightly with the colourful fluorescent and neon lamps of advertisement signs. Familiar too is ultraviolet radiationwhich the eyes cannot see but whose effect is felt as pain from sunburn.
Ultraviolet light represents a kind of electromagnetic radiation that can be harmful to life. Such is also true of X-rayswhich are important in medicine as they allow physicians to observe the inner parts of the body but exposure to which should be kept to a minimum. Less familiar are gamma rayswhich come from nuclear reactions and radioactive decay and are part of the harmful high-energy radiation of radioactive materials and nuclear weapons.
Page 1 of 6.Electromagnetic radiation, in classical physics, the flow of energy at the universal speed of light through free space or through a material medium in the form of the electric and magnetic fields that make up electromagnetic waves such as radio waves, visible light, and gamma rays.
Ionizing radiation is a specific type of radiation that has enough energy to eject an electron from some atom. This radiation includes ionizing particles from alpha or beta decay, as well as electromagnetic waves in the form of gamma radiation.
Ionizing Radiation. A photon is a quantum of EM radiation. Its energy is given by and is related to the frequency and wavelength of the radiation by.
Course Objectives • Understand the basic physics of the electromagnetic and particulate forms of ionizing radiation.
• Understand the distinctions between the units of radiation quantity, exposure and dose. • Be familiar with some of the methods used to measure radiation dose. Basic Physics of Ionizing Radiation Center for Medical Countermeasures Against Radiation Robert E.
Reiman, MSPH, MD, Duke University Medical Center Electromagnetic radiation can also be described as radiation, energy and the biological system under consideration. I've read from several sources that electromagnetic radiation begins to have an "ionizing" effect right around the time the frequency passes the uv spectrum and into x-ray/gamma ray spectrum.