The half-life of ^198 Au is 2.7 days. Calculate (a) the decay constant... 06:18 A radioactive sample has 6.0 xx 10^18 active nuclei at a certain insta... 02:19 The activity of a radioactive sample falls from 600 s^(-1) to 500 s^(-... 03:23 The number of ^238 U atoms...
US5134294 * 1989年8月10日 1992年7月28日 Wallac Oy Apparatus and a method for measuring the activity of radioactive samples containing a multiple of radioactive isotopes
(redirected fromActivity (radioactivity)) Thesaurus Encyclopedia radioactive decay n. 1.Spontaneous disintegration of a radionuclide with the emission of energetic particles or radiation, such as alpha or beta particles or gamma rays. 2.An instance of such disintegration. ...
In a liquid scintillation counter the light output from a liquid scintillation sample containing radioactive isotopes of unknown activity is measured by means of a detector. A pulse height analyzer having discriminators that are combined to define pulse height windows, is connected to the detector fo...
Useful Radiation Data Radiation Physics GLOSSARY Activity The activity, A, of an amount of radioactive nu- clide in a particular energy state at a given time is the quotient A = dN/dt, in which dN is the expectation value of the number of spontaneous nuclear transitions from that energy ...
Some of the radioactive materials discharged by human activity are not found in nature, such as plutonium, while others which are found naturally may be discharged in different physical and chemical forms, allowing them to spread more readily into the environment, or perhaps accumulate in the food...
A radioactive source has a half-life of 6 days.How long will it take for the count rate to fall from 180 per minutes to 145? The half-life of iodine-131 is 8.04 days.On a certain day,the activity of an iodine-131 sample is 6.6...
If the isotope is deposited on a thin foil, mounted in a vacuum to eliminate gas ionization and an electric field is applied to prevent slow secondary electrons from escaping, then the current flowing from the foil should be a direct measure of the total activity. The accurate measurement of...
point geometry point activity point application for point att o point averages point caracteristic f point competition point distillation point equalization point frequency switc point modification point motio point of buttocksee i point of compound cur point of connection point of subjective e point ...
(redirected fromActivity (radioactivity)) Dictionary Thesaurus Medical radioactive decay (ray-dee-oh-ak-tiv)The spontaneous transformation of one atomic nucleus into another with the emission of energy. The energy is released in the form of an energetic particle, usually analpha particle,beta particl...