"Email " is the e-mail address you used when you registered.
"Password" is case sensitive.
If you need additional assistance, please contact customer support.
A third gamma-ray interaction process is possible when the incoming photon energy is above 1.02 MeV. In the field of a nucleus of the absorber material, the photon may disappear and be replaced by the formation of an electron-positron pair. The minimum energy required to create this pair of particles is their combined rest-mass energy of 1.02 MeV. Therefore, pair production cannot occur for incoming photon energies below this threshold. When the photon energy exceeds this value, the excess energy appears as initial kinetic energy shared by the positron and electron that are formed. The positron is a ... (100 of 18328 words)
Aspects of the topic radiation measurement are discussed in the following places at Britannica.
Copy and paste the HTML below to include this widget on your Web page.
Copy Link
|
Please join our community in order to save your work, create a new document, upload
media files, recommend an article or submit changes to our editors.
Enter the e-mail address you used when registering and we will e-mail your password to you. (or click on Cancel to go back).
Add to project: | |
Remove from Project: |