en

electron positron pair

1

Terminological databases

Meditsiinifüüsika terminibaas

ID 471682 Last modified 13.09.2019
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Domain radiation protection, dosimetry
  • pealelangeva footoni ja sihtmärgi tuuma vahelises vastasmõjus tekkiv elektroni ja positroni paar; sellise osakestepaari tekkeks peab pealelangeva footoni energia olema vähemalt 1,022 Mev, mis vastab elektroni ja positroni seisumasside summale; emiteeritud positron annihileerub kiiresti mingi orbitaalelektroniga, tekitades kaks täpselt vastassuunalist footonit energiaga 511 keV

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