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[求助]
cpm是神马单位？ 已有3人参与
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| The confluent cells were incubated in serum-free medium for 30 min followed by the addition of 50,000-100,000 cpmcpm of 125I-labeled human growth hormone (hGH） |
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2楼2014-02-27 17:55:01
3楼2014-02-27 18:29:18
wizardfan
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和放射有关的就是counts per minute The measurement of ionizing radiation is sometimes expressed as being a rate of counts per unit time registered by a radiation monitoring instrument, of which counts per minute and counts per second are commonly used. This measurement is only of the rate of events registered by the measuring instrument, not the rate of events at the point of original emission. For radioactive decay measurements it must not be confused with disintegrations per unit time (dpm), which represents the rate of atomic disintegration events at the source of the radiation. Count rates are normally associated with the measurements of particles, such as alpha particles and beta particles. For gamma ray and X-ray dose measurements a unit such as the Sievert is normally used |
4楼2014-02-28 06:23:45
yipan 
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7楼2014-03-18 21:22:09
fightcricket
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8楼2014-03-20 07:13:42
fightcricket
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虽然关了贴，但我想补一段。 Disintegrations per minute (dpm) and disintegrations per second are measures of the intensity of the source of radioactivity. The SI unit of radioactivity, the becquerel, is equivalent to one disintegration per second. It is included in this article to show that it should not be confused with cpm. Becquerels is the strength of the source of radiation, but cpm is the number of counts received by an instrument from that source. The efficiency of the radiation detector (e.g. scintillation counter) and its relative position to the source of radiation must be accounted for when relating cpm to dpm. Dpm is the number of atoms that have decayed, not the number of atoms that have been measured as decayed. SI Units for radioactive disintegration[edit] One becquerel (Bq) is equal to one disintegration per second; 1 becquerel (Bq) is equal to 60 dpm. One curie (Ci) is equal to 3.7×1010 Bq or dps, which is equal to 2.22×1012 dpm. 这才完整。 |
9楼2014-03-20 07:30:19