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Vol. 237, Issue 9-10, September-October 2019, pp. 122-128

 

Bullet

 

Negative Ion Instrumentation for Detection of the Electron Affinity of Astatine
 

Lars E. Bengtsson

University of Gothenburg, Kemivägen 9, 412 96 Gothenburg, Sweden
Tel.: +4631 786 9128

E-mail: lars.bengtsson@physics.gu.se

 

Received: 30 August 2019 /Accepted: 27 September 2019 /Published: 30 November 2019

Digital Sensors and Sensor Sysstems

 

Abstract: 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 a-radiation agent in radioimmunotherapy.

 

Keywords: Ion optics, Astatine, Pico ammeter, a-radiation, Radioimmunotherapy, Microcontroller.

 

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