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  2. Jefimenko's equations - Wikipedia

    en.wikipedia.org/wiki/Jefimenko's_equations

    Jefimenko says, "...neither Maxwell's equations nor their solutions indicate an existence of causal links between electric and magnetic fields. Therefore, we must conclude that an electromagnetic field is a dual entity always having an electric and a magnetic component simultaneously created by their common sources: time-variable electric ...

  3. Airborne particulate radioactivity monitoring - Wikipedia

    en.wikipedia.org/wiki/Airborne_particulate...

    The output of the radiation detector is a random sequence of pulses, usually processed by some form of "ratemeter," which continuously estimates the rate at which the detector is responding to the radioactivity deposited on the filter medium. There are two fundamental types of ratemeters, analog and digital.

  4. Friedmann equations - Wikipedia

    en.wikipedia.org/wiki/Friedmann-Lemaitre...

    This leads to / radiation-dominated Note that this solution is not valid for domination of the cosmological constant, which corresponds to an w = −1. In this case the energy density is constant and the scale factor grows exponentially. Solutions for other values of k can be found at Tersic, Balsa.

  5. Radiophysics - Wikipedia

    en.wikipedia.org/wiki/Radiophysics

    Radiophysics (also modern writing radio physics [1]) is a branch of physics focused on the theoretical and experimental study of certain kinds of radiation, its emission, propagation and interaction with matter. The term is used in the following major meanings: study of radio waves (the original area of research) study of radiation used in ...

  6. Radiative transfer - Wikipedia

    en.wikipedia.org/wiki/Radiative_transfer

    Radiative transfer (also called radiation transport) is the physical phenomenon of energy transfer in the form of electromagnetic radiation. The propagation of radiation through a medium is affected by absorption, emission, and scattering processes. The equation of radiative transfer describes these interactions mathematically.

  7. Radioactivity in the life sciences - Wikipedia

    en.wikipedia.org/wiki/Radioactivity_in_the_life...

    Not all molecules in the solution have a P-32 on the last (i.e., gamma) phosphate: the "specific activity" gives the radioactivity concentration and depends on the radionuclei's half-life. If every molecule were labelled, the maximum theoretical specific activity is obtained that for P-32 is 9131 Ci/mmol.

  8. Radioactive displacement law of Fajans and Soddy - Wikipedia

    en.wikipedia.org/wiki/Radioactive_displacement...

    The law of radioactive displacements, also known as Fajans's and Soddy's law, in radiochemistry and nuclear physics, is a rule governing the transmutation of elements during radioactive decay. It is named after Frederick Soddy and Kazimierz Fajans , who independently arrived at it at about the same time in 1913.

  9. Internal dosimetry - Wikipedia

    en.wikipedia.org/wiki/Internal_dosimetry

    Internal dosimetry is the science and art of internal ionising radiation dose assessment due to radionuclides incorporated inside the human body. [1]Radionuclides deposited within a body will irradiate tissues and organs and give rise to committed dose until they are excreted from the body or the radionuclide is completely decayed.