| 查看: 3298 | 回复: 8 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
[求助]
cpm是神马单位？ 已有3人参与
|
|||
| 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） |
回复此楼» 猜你喜欢
一志愿北京化工大学材料与化工 264分各科过A区国家线
已经有6人回复
-
085600 材料与化工 329分求调剂
已经有9人回复
-
一志愿厦门大学化学学硕307求调剂
已经有3人回复
-
315分求调剂
已经有4人回复
-
化学调剂一志愿上海交通大学336分-本科上海211
已经有4人回复
-
总分293求调剂
已经有7人回复
-
环境专硕324分求调剂推荐
已经有3人回复
-
284求调剂
已经有3人回复
-
北京林业大学硕导招生广告
已经有6人回复
-
0703化学/290求调剂/本科经历丰富/工科也可
已经有3人回复
» 本主题相关价值贴推荐，对您同样有帮助:
fightcricket
金虫 (正式写手)
- 应助: 4 (幼儿园)
- 金币: 694.3
- 散金: 30
- 红花: 1
- 帖子: 414
- 在线: 263.3小时
- 虫号: 972848
- 注册: 2010-03-16
- 专业: 细胞信号转导
|
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
2楼2014-02-27 17:55:01
3楼2014-02-27 18:29:18
wizardfan
至尊木虫 (著名写手)
- BioEPI: 18
- 应助: 599 (博士)
- 贵宾: 1.818
- 金币: 24632.2
- 散金: 197
- 红花: 48
- 沙发: 2
- 帖子: 2254
- 在线: 400.7小时
- 虫号: 1879241
- 注册: 2012-07-05
- 性别: GG
- 专业: 生物信息学
【答案】应助回帖
感谢参与，应助指数 +1
|
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
