6533b862fe1ef96bd12c7582
RESEARCH PRODUCT
The Distribution of Slowing-Down Times of Positrons Emitted from <sup>22</sup>Na and <sup>68</sup>Ge\<sup>68</sup>Ga Isotopes into Metals
P. HorodekJerzy Dryzeksubject
Nuclear physicsPhysicsThermalisationPositronDistribution (mathematics)IsotopeMechanics of MaterialsMechanical EngineeringMonte Carlo methodEnergy spectrumGeneral Materials ScienceAtomic physicsCondensed Matter Physicsdescription
The results of the Monte Carlo simulation, using GEANT4 codes, of the slowing-down time prior to the thermalization in metals for positrons emitted from the 22Na and 68Ge\68Ga sources are presented. Due to the energy spectrum and probabilistic processes accompanying positrons traversing a medium the slowing-down time exhibits a distribution which has a long tail. Nevertheless, the average value of the time is ranged from 0.4 ps to 8 ps depending on the density of the medium as it is for the 22Na positrons. For positrons emitted from the 68Ga nucleus the average value of the slowing-down time increases and it is ranged from 1 ps to 20 ps.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-12-01 | Materials Science Forum |