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Negative Ion Instrumentation for the Detection of the Electron Affinity of Astatine

Journal article
Authors Lars Bengtsson
Published in Sensors & Transducers Journal
Volume 237
Issue 9-10
Pages 122-128
ISSN 1726-5479
Publication year 2019
Published at Department of Physics (GU)
Pages 122-128
Language en
Keywords Ion optics, Astatine, Pico ammeter, α-radiation, Radioimmunotherapy, Microcontroller.
Subject categories Accelerator Physics and Instrumentation, Atomic physics, Electrical Engineering, Electronic Engineering, Information Engineering, Embedded Systems


For the purpose of measuring the electron affinity of Astatine, a versatile tool for ion beam line up is proposed. Apertures in the ion optics are used to guide the beam and traditionally the current is measured on the apertures in order to detect the presence of an ion beam. By slitting the aperture into four separate pieces, the aperture current can also be used to determine the direction of the misalignment and the size of the ion beam diameter. A 4-channel pico ammeter with optical LED indication of the ion beam position is suggested in an analog/digital hybrid design. The design utilizes two charge/current-to-digital chips in a microcontroller design. This work is an important contribution to an ongoing project with the objective to determine the electron affinity of Astatine which is a potential α-radiation agent in radioimmunotherapy.

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