Seminar der Abteilung Strahlenschutz und Sicherheit (ASI)

28 March 2018 10:30-11:30 Uhr, OFLG/402 (Coffee with speaker from 10:00-10:30)

What does it mean to be a radiometrologist at a university hospital?
Claude Bailat, PhD, Institute of radiation physics, University Hospital (CHUV), Lausanne

Abstract: Radiometrology is performed in various institutions, such as PSI. In a clinical context, radiometrology can be seen as an extension of national metrology institutes or designated institutes. At IRA, radiometrology is performed at a primary and secondary level. It supports nuclear medicine as well as radiotherapy activities and developments. I propose for this talk to give you an overview of the duties of the group of radiometrology. We will detail two or three research projects to show practically what is expected of radiometrologists in a clinical environment.
29 May 2018 10:30-11:30 Uhr, OFLG/402 (Coffee with speaker from 10:00-10:30)

Radiation protection at SwissFEL: Latest experimental results to benchmark the shielding structure and the Dose Rate Protection System assumptions
Marco Tisi, Abteilung Strahlenschutz und Sicherheit, PSI

Abstract: SwissFEL, the new FEL facility, is now under commissioning at PSI. From a radiation protection point of view, SwissFEL operation requires a permanent monitoring of the radiation level in the surroundings of the facility. This task is performed by the lately installed Dose Rate Protection System (DRPS). With the increase of the electron beam energy to 2.5 GeV, measurement campaigns have been performed in order to verify the compliance with the guidance values imposed by law in the adjacent premises to the facility and benchmark DRPS model assumptions and calibration parameters, previously derived by calculations and Monte Carlo simulations.
18 June 2018 10:30-11:30 Uhr, OFLG/402 (Coffee with speaker from 10:00-10:30)

Emergency OSL/TL Dosimetry with Components of Mobile Phones and Other Personal Items
Stephen W. S. McKeever, Oklahoma State University

Abstract: Community response to large-scale radiological incidents, such as nuclear power plant accidents or terrorist attacks, requires the ability to determine the doses potentially received by individual members of the public. Normally, such individuals do not carry personal radiation dosimeters (such as TLDs, RPLDs, etc.) and therefore alternative radiation dosimetry methods need to be developed for eventual deployment following such major events. Two types of dosimetry are currently under investigation for this purpose, namely biological dosimetry (using specific biological markers for the absorption of radiation) and physical dosimetry (using radiation-induced physical markers in objects located on or near the individual). This talk will discuss the development of physical dosimetry methods, focusing primarily on luminescence (thermoluminescence (TL) and optically stimulated luminescence (OSL)) and electron paramagnetic resonance (EPR) of materials found in personal electronic devices, such as smart phones. The state-of-the-art of these research developments will be described along with projections for their potential utility.
17 July 2018 10:30-11:30 Uhr, PSI Bildungszentrum EG6 (Coffee with speaker from 10:00-10:30)

Characterization of neutron stray fields around high-energy accelerators using spectrometric and Monte Carlo methods
Roman Galeev, Abteilung Strahlenschutz und Sicherheit, PSI

Abstract: Many tasks associated with radiation protection, waste management and research are strongly dependent on assumptions and modeling. It is desirable to benchmark and optimize these assumptions with measurements of the neutron spectrum. A device suitable for this task is multisphere spectrometer. Such a system is currently under commissioning at PSI.This talk gives the overview of the system calibration and results of first measurements in workplace fields with high energy neutron component available at PSI.
21 August 2018 10:30-11:30 Uhr, PSI Bildungszentrum EG6 (Coffee with speaker from 10:00-10:30)

Erfahrungen im Projekt "Beton-Schredder in der Kernanlage SAPHIR";
Robert Maag, Sektion Rückbau und Entsorgung, PSI

Abstract: Ursprünglich wurde vorgesehen, die leicht aktivierten Betonstrukturen, die aus dem Abbruch der Poolabschirmung stammen, für 30 Jahre zum Abklingen einzulagern. Mit Einführung der revidierten Strahlenschutzverordnung per 1.1.2018 und den damit verbundenen neuen nuklidspezifischen Befreiungsgrenzen, wäre eine Abklinglagerung nicht mehr zielführend gewesen. Aus diesem Grund wurde das Projekt "Beton-Schredder"; initialisiert, um für eine möglichst grosse Menge an Betonmaterial den Nachweis der Unterschreitung der noch gültigen Freigabewerte zu erwirken. Der Vortrag erklärt die Vorgehensweise und die Erfahrungen in diesem zeitlich knapp begrenzten Projekt, das erfolgreich abgeschlossen wurde. Abstract
20 November 2018 10:30-11:30 Uhr, PSI Bildungszentrum EG6 (Coffee with speaker from 10:00-10:30)

The Potential of Terbium-161 for Targeted Radionuclide Therapy: Combining β¯- Particles and Auger Electrons for More Efficient Cancer Therapy
Cristina Müller, Center for Radiopharmaceutical Sciences, BIO, PSI und Nicholas P. van der Meulen, Laboratory for Radiochemistry, NES, PSI

Abstract: Tb-161 is of great interest to be used for therapeutic purposes in nuclear medicine. It provides similar decay properties as the routinely-used Lu-177 but, in addition, it emits substantial number Auger electrons. It is believed that the Auger electrons can efficiently kill small metastases or even single cancer cells. The emission of g-rays allows using the radionuclide for Single Photon Emission Computed Tomography (SPECT) which is useful for therapy monitoring and dosimetry calculations. The production and preclinical evaluation of Tb-161 have been developed at PSI. Optimization of the production process and more detailed investigation in terms of biological effectiveness are on-going. It is the aim to translate Tb-161 in clinical practice within the next few years.

-- Main.VeronikaHeber - 21 Mar 2019