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A unit used to describe the rate of radioactive decay. One Becquerel equals one disintegration per second. 

All radionuclides are uniquely identified by three characteristics the type of radiation they emit, the energy of radiation, and the rate at which the spontaneous transformation occurs—the activity. The activity is expressed in a unit called the becquerel (Bq). One becquerel equals one transformation per second. Different radionuclides are transformed at... 

Curie (Ci) A unit of radioactivity, related to the emission from 1 g of radium, it is equal to 3.7 x 10 disintegrations per gram per second. This unit has been replaced by the Becquerel (Bq) 1... 

Becquerel (Bq)—International System of Units unit of activity and equals that quantity of radioactive material in which one transformation (disintegration) occurs per second (see Units). 

The curie unit (Ci) is based on the activity of 1 g of pure radium-226, which undergoes 3.7 X 1010 transformations per second. It is therefore defined as the quantity of a radioactive isotope which gives 3.7 X 1010 disintegrations per second. The SI unit of activity is the becquerel (Bq), which is equal to one nuclear transformation per second. Hence ... 

The SI unit of measure for radioactivity. One becquerel (Bq) is equal to one disintegration per second (dps), thereby corresponding to about 2.703 x 10 curie. 

Background Radiation amount of natural radiation detected in the absence of nonnatural radioactive sources Base a substance that yields hydroxide ions in solution or accepts protons Becquerel SI unit for activity equal to one disintegration per second, abbreviated Bq... 

Decay rate is way to quantify radioactive decay and is equal to the number of radioactive decays or disintegrations occurring per unit time. The official SI unit of decay rate is the becquerel (Bq) defined to be ... 

The activity of a radioactive sample is quoted in Becquerels (named after the discoverer of natural radioactivity) and it varies from one element to another. One atomic disintegration per second is called one Becquerel (Bq). A further unit often used is the Curie (Ci), which is the activity produced by 1 g of radium 226 and is equal to 3.7 x 1010 disintegrations per second. 

In order to understand the effects of radiation on any material, let us define how one measures radiation. Radiation is measured in several units. The SI unit for radioactivity is the becquerel (Bq), which is defined as one disintegration (d) per second (s) (Bq = d/s). However, the most common unit is the curie (Ci) and its definition is based on the number of radium-226 isotopes present in 1 gram of the element that disintegrate in one second. One Ci is thus exactly equal to 3.70 x 1010 disintegrations per second... 

The fundamental SI unit of activity is the Becquerel (Bq). One Bq is equal to one disintegration per second (dps). Because this is a very small unit, it is more often expressed in kilobequerels or kBq. However, the older historical unit of activity Q is normally used for radiopharmaceuticals. The Curie was defined in terms of the number of disintegrations per second of 1 g of Ra and is equal to 3.7 x 10 ° dps. Other commonly used imits are millicurie and microcurie (mCi and pCi). The unit of Ci represents absolute activity (A). However, relative activity R is proportional to the efficiency of the counting device. The device reports in counts per minute. 

The defining event of a radioactive nuclide is the transformation of its nucleus into the nucleus of another species, that is, radioactive decay. The number of nuclear transformations occurring per unit of time is called activity . Sometimes radioactivity is used instead of activity . The traditional unit of activity has been the Curie (Ci), which is equal to 3.7 X 10 ° nuclear transformations per second. The conversion of radiation units to the international system (Sysfme International d Unit or SI) has now taken place in the United States. The more fundamental unit of activity, the Becquerel (Bq), equal to 1 nuclear transformation per second, has replaced the Curie. Both units of activity are modified by prefixes such as kilo-, milli-, and micro- to achieve standard multiples of the fundamental unit. A listing of the most commonly used prefixes is given in Table 1. 

The hecquerel (Bq) is the SI unit of radioactivity and is defined as one decay per second (dps). Because 1 Bq is a very small amount of activity, the activity of typical chemistry samples is often expressed in kilobecquerels (kBq). The curie (Ci) is the older, conventional unit it is defined as 3.7 X 10 dps. One curie equals 37 gigabecquerels (GBq). Because the becquerel is inconveniently small and the curie very large, they are typically used as their multiples or submultiples, for example, megabecquerels (MBq) and miUicuries (mCi). One mCi equals 37 MBq. 

Becquerel (Bq). A unit of radioactivity. One becquerel is equal to 1 disintegration per second. 

Radioactively labelled proteins may be visualized without staining by autoradiographic methods which were first introduced by Becquerel and Curie in their discovery of the phenomenon of radioactivity (13.), or f 1 uorographic techniques for some of the weak beta emitters, such as tritium(M ). If the proteins are radioactively labled to a high specific activity, they can be detected with sensitivities equal and often better than those obtained by the most stains. However, the use of radioactively labled proteins is limited as it is difficult to achieve high specific activities in animal studies and unethical in reseach involving humans. 

The SI unit of radioactivity is the becquerel (Bq) and is equal to one nuclear disintegration per second. The unit is named after Henri Becquerel, who discovered the phenomenon of radioactivity in 1896. A non-SI unit also in use is the curie (Ci), where 1 Ci = 3.7 x 10 ° Bq the curie is named after Marie Curie, who discovered the elements radium and polonium. 

The SI unit of radioactivity is the becquerel (Bq) it is defined as one disintegration per second (d/s) 1 Bq = 1 d/s. A much larger and more common unit of radioactivity is the curie (Ci) 1 curie equals the number of nuclei disintegrating each second in 1 g of radium-226 ... 

Becquerel (Bq) - The SI unit of radioactivity (disintegrations per unit time), equal to s. [1]... 

Ao is the activity in disintegrations per second, (in becquerel - Bq) exaaiy at the end of the irradiation (at zero decay time, ta = 0) and ti is the time of irradiation. The expression in parentheses, 1 - e is called the saturation factor or S. It varies from 0 to 1 zero for ti = 0 or an extremely short irradiation, one for tj ti/2 or an infinitely long irradiation reiative to the ti/2 of the radioisotope. In practice, S rapidly and asymptotically approaches the limiting value of one with increasing ti relative to the ti/2 of the activated radioisotope species. At saturation, Ao simply equals NOa (steady state of formation of the radioisotope, rate of formation equaling rate of decay). 

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