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Characterising & Standardising ‘Interesting’ Radiosotopes at the UK National Physical Laboratory

Jeudi 26 janvier 2017 14:00 - Duree : 1 heure
Lieu : ILL 4, seminar room, 1st floor - 71 avenue des Martyrs - Grenoble

Orateur : Patrick H. REGAN (Department of Physics, University of Surrey, Guildford, GU2 7XH, UK and Acoustics and Ionizing Radiation Division, National Physical Laboratory, Teddington, TW11 0LW, UK)

The radioactivity group based at the National Physical Laboratory (NPL) is responsible for traceability of radiological standards within the UK. This requires the use of a range of novel and high-precision radiation detection systems which can be utilised to provide definitive standards of the stoichiometry, decay rate and physical nature of emissions from different samples of radioactive materials. The link in the (ideally) unbroken calibration chain for radiopharmaceuticals and other radioactive sources / reference materials is based at the NPL, which is responsible for traceability to Becquerel (Bq) within the UK. This presentation will outline some of the experimental techniques which are used to provide primary and secondary standards for radioactivity calibrations based on gamma-ray and/or charged particle spectrometry. An example of the recent standardisation of the naturally occurring radionuclide 223Ra [1-3] will be presented. This is of particular current focus as this radionuclide is both a member of the actinium (4n+1) chain headed by 235U and also the main therapeutic component in the radiopharmaceutical XOFIGO© [4]. The presentation will also outline some of the other methods for the production and radiochemical separation of 236Np as a long-lived tracer for 237Np measurements in nuclear spent fuel / waste management [5] and finally outline the development of a novel, digitally-based system for primary standardisation using coincident gamma-ray spectroscopy with LaBr3(Ce) detectors [6], thereby utilising spin-out knowledge from the recent EXILL-FA TIMA experimental campaign performed at ILL [7].

REFERENCES :

[1] Collins, S.M., Pearce, A.K., Ferreira, K.M., Fenwick, A.J., Regan, P.H. and Keightley, J.D., 2015. Direct measurement of the half-life of 223Ra. Applied Radiation and Isotopes, 99, pp.46-53 ; Keightley, J., Pearce, A., Fenwick, A., Collins, S., Ferreira, K. and Johansson, L., 2015. Standardisation of 223Ra by liquid scintillation counting techniques and comparison with secondary measurements. Applied Radiation and Isotopes, 95, pp.114-121.

[2] Collins, S.M., Pearce, A.K., Regan, P.H. and Keightley, J.D., 2015. Precise measurements of the absolute γ-ray emission probabilities of 223Ra and decay progeny in equilibrium. Applied Radiation and Isotopes, 102, pp.15-28.

[3] Collins, S.M., Pommé, S., Jerome, S.M., Ferreira, K.M., Regan, P.H. and Pearce, A.K., 2015. The half-life of 227Th by direct and indirect measurements. Applied Radiation and Isotopes, 104, pp.203-211.

[4] https://www.xofigo-us.com/patient/index.php

[5] Larijani, C., Pickford, O.L., Collins, S.M., Ivanov, P., Jerome, S.M., Keightley, J.D., Pearce, A.K. and Regan, P.H., 2015. Progress towards the production of the 236gNp standard sources and competing fission fragment production. Radiation Physics and Chemistry, 116, pp.69-73.

[6] Lorusso, G., Shearman, R., Regan, P.H., Judge, S.M., Bell, S., Collins, S.M., Larijani, C., Ivanov, P., Jerome, S.M., Keightley, J.D. and Lalkovski, S., 2016. Development of the NPL gamma-ray spectrometer NANA for traceable nuclear decay and structure studies. Applied Radiation and Isotopes, 109, pp.507-511.

[7] Régis, J.M., Simpson, G.S., Blanc, A., de France, G., Jentschel, M., Köster, U., Mutti, P., Paziy, V., Saed-Samii, N., Soldner, T. and Ur, C.A., 2014. Germanium-gated γ–γ fast timing of excited states in fission fragments using the EXILL&FATIMA spectrometer. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment, 763, pp.210-220

Contact : tellier@ill.fr

Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Evènement répétitif : (General ILL Seminar - College 3)
Site de l'évènement : Polygone scientifique

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