CYCLOTRONS2022 - List of Keywords (positron)

Paper	Title	Other Keywords	Page
WEBO03	Positron Emitters Produced from Naturally Occurring Targets	target, cyclotron, vacuum, radiation	183
	T.W. Leadbeater, A. Buffler, T. Hutton, M. van Heerden UCT Physics, Cape Town, South Africa
	Short lived positron emitters are used as flow following tracer particles in the study of dynamic processes within physics and engineering applications. For full representation of the materials of interest, tracer particles must be activated with proton rich radionuclides utilising reactions on their naturally abundant isotopic content. Cyclotron accelerated alpha particle beams incident upon (16O) oxygen rich targets have been investigated in producing the positron emitter 18F within naturally occurring materials. Simulations and numeric calculations of the beam conditions are used to maximise the activation yield and minimise heat load by carefully placing the Bragg peak in relation to the water-cooled target. Corresponding to the target thickness, the 100 MeV extraction energy is degraded to match a broad resonance in 18F production around 35 MeV, while maintaining energy above the 18 MeV threshold. Beam currents below 1 µA resulted in typical 18F yields of 1 - 2 mCi within spherical SiO₂ targets of diameters 1 - 10 mm, ideal for envisaged application studies.
	Slides WEBO03 [4.876 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEBO03
About •	Received ※ 28 December 2022 — Revised ※ 16 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 27 May 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

WEBO03

Positron Emitters Produced from Naturally Occurring Targets

target, cyclotron, vacuum, radiation

183

T.W. Leadbeater, A. Buffler, T. Hutton, M. van Heerden
UCT Physics, Cape Town, South Africa

Short lived positron emitters are used as flow following tracer particles in the study of dynamic processes within physics and engineering applications. For full representation of the materials of interest, tracer particles must be activated with proton rich radionuclides utilising reactions on their naturally abundant isotopic content. Cyclotron accelerated alpha particle beams incident upon (16O) oxygen rich targets have been investigated in producing the positron emitter 18F within naturally occurring materials. Simulations and numeric calculations of the beam conditions are used to maximise the activation yield and minimise heat load by carefully placing the Bragg peak in relation to the water-cooled target. Corresponding to the target thickness, the 100 MeV extraction energy is degraded to match a broad resonance in 18F production around 35 MeV, while maintaining energy above the 18 MeV threshold. Beam currents below 1 µA resulted in typical 18F yields of 1 - 2 mCi within spherical SiO₂ targets of diameters 1 - 10 mm, ideal for envisaged application studies.

Slides WEBO03 [4.876 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEBO03

About •

Received ※ 28 December 2022 — Revised ※ 16 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 27 May 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)