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  1. 不單止,於胎兒形成時已經有,即所謂的本底輻射( background radiation )。 http://sciencecity.oupchina.com.hk/npaw/student/chi/glossary/ background _ radiation .htm 本...

  2. The universe is full of background radiation with photons of 2.7 K, i.e. in the microwave range. In other...

  3. ... KE is NOT zero. 2010-04-05 23:53:11 補充: By background radiation , we usually mean radiation coming from the "natural environment". ...

  4. ...to 1 pm, there is 1 half-life elapsed. So, count rate due to background radiation = 100 - (100 - 80) X 2 = 60 counts per min Initial ...

  5. ...tube when it is placed at Q. (ii) It is the background radiation (本底輻射) (iii) The source emits beta particles and gamma...

  6. ... crucial. In the actual fact, we are constantly exposed to background radiation of all sorts, some of which are of very high energies. It...

  7. ... a GM tube. 本底幅射是否一定能被GM管測得?? Not all background radiation can be detected by a GM tube. Extrememly high energy cosmic...

  8. ...dose", every person on earth receives about 2500 uSv per year from background radiation ]. 我比較擔心輻射的問題?請問會有什麼後遺症?? A dose of 60 uSv...

  9. ... pulses into count-rates. Also, which type of background radiation so counted is important. An alpha detector could record a background ...

  10. ... in distinguishing the infrared radiation from the aircraft or the background radiation . So, microwave is used instead of infrared. Also, microwave...