JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{leadbeater:cyclotrons2022-webo03,
author = {T.W. Leadbeater and A. Buffler and T. Hutton and M. van Heerden},
title = {{Positron Emitters Produced from Naturally Occurring Targets}},
% booktitle = {Proc. CYCLOTRONS'22},
booktitle = {Proc. 23rd Int. Conf. Cyclotrons Appl. (CYCLOTRONS'22)},
pages = {183--186},
paper = {WEBO03},
language = {english},
keywords = {target, positron, cyclotron, vacuum, radiation},
venue = {Beijing, China},
series = {International Conference on Cyclotrons and their Applications},
number = {23},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2023},
issn = {2673-5482},
isbn = {978-3-95450-212-7},
doi = {10.18429/JACoW-CYCLOTRONS2022-WEBO03},
url = {https://jacow.org/cyclotrons2022/papers/webo03.pdf},
abstract = {{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.}},
}