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After submission of a scientific project in 2001, the cyclotron Arronax reached full power on October 25, 2010 and has been operational since 2011.

2001: the scientific file written by Jacques Barbet, Jean-François Chatal, Jacques Martino and Yves Thomas is presented to scientific authorities and potential funders
May 3, 2002: after scientific expertises from CNRS, Inserm, CEA and Universities, the Ministry of Research formalizes a scientific evaluation of the submitted document
2002-2003: A study of technical and economic feasibility, co-funded by the Regional Council of Pays de la Loire and the State (Prefecture) and led by the University Hospital of Nantes, confirms the technical feasibility and more accurately assesses the costs of investment and operation
December 18, 2003: The project, led by the University of Nantes and supported by the Minister Francois Fillon and the President of the Regional Council of Pays de la Loire, Jean-Luc Harousseau, receives a favorable advice of the Interministerial Committee for the Planning and Development of the Territory (CIADT)
July 9, 2004: Jacques Auxiette, newly elected President of the Regional Council of Pays de la Loire, supports and decides to launch the project to be installed on the northern site of the Nantes University Hospital, on land made available by the hospital. The project ownership is delegated by the State to the Region Pays de la Loire during the building period.
End of 2004 : the financial closure of the estimated investment of € 36.9 million is provided with the following distribution
State: € 8.4 million
Region Pays de la Loire: 14.260 M €
European Funds: 7,490 M €
Poitou Charente Brittany Regional Council: 0.750 M €
Pays de la Loire Regional Council: 0,500 M €
General Council of Loire Atlantique: 2.00 M €
General Council of Maine et Loire: 0,300 M €
Nantes Métropole: 3.00 M €
Angers Loire Métropole: 0,200 M €

2005: definition of the equipments and award of public contracts
7 December 2006: laying of the first foundation stone
March 2008: delivery of the cyclotron, then assembly, tests and adjustments
November 7, 2008: Inauguration of the cyclotron and Arronax site in the presence of Prime Minister François Fillon, President of Region Jacques Auxiette, Deputy Mayor of Nantes Jean-Marc Ayrault, Mayor and Senator of Saint Herblain Jean-Charles Gautier

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25 October 2010 :: the cyclotron reaches full power for 24 hours
2011: The cyclotron produces Strontium-82 in routine and R/D allows for the production of copper-64, Ge-68, Scandium-44 and radiolysis, radiobiology and physics experients.