RADIOACTIVE ION BEAMS AT B.RANNOU W.MITTIG M.G.ST LAURENT (GANIL France)

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Presentation transcript:

RADIOACTIVE ION BEAMS AT B.RANNOU W.MITTIG M.G.ST LAURENT (GANIL France)

plan 1.The GANIL and SPIRAL I RIBs facility safety and radiation protection 2.The LINAG project

GANIL Stable beams from C to U Maximum energy 95 AMeV Intensity pps (6 kW) RIB production in-flight method : SISSI and LISE ISOL method : SPIRAL I (SIRa)

SPIRAL I Primary beams From C 95 AMeV to Kr 68 AMeV Power max 6 kW (1.5 kW) Target C ECR ion source 15 days of irradiation Secondary beams No restriction in mass Emax = 25 AMeV

SPIRAL I cave

SPIRAL I target source

Activation and Dose rate calculation ( EPAX )

Dose rate measurement calculation Calculation measure

Cooling water activation Dose rate 25 µSv/h at 30 cm during operation (13C 75 AMeV 1.5kW) After one year 45 kBq/l

Radioactive release Normal conditions 1.Air activation by neutrons (radioactive gases short life) 2.Storage of gases from vacum system Accidents  Air Ventilation system with high efficiency filtre Impact of the SPIRAL facility : 0.06 µSv/year

Airborne activation neutron Air activity A max = Bq/m3 (gaz) and 60 Bq/m3 (aerosol) for 1.5 kW 13 C 75 AMeV beam After beam shut traces (1 Bq/cm 2 )

LINAG project

Goals Production of RIB’s from fission products using ISOL method Deuterons beam 40 MeV, 5 mA (200 kW) C converter for neutron production UCx production target > fissions/s Irradiation time 3 months

Converter and Target activation Calculations performed with LAHET MCNP CINDER code : Total activity Activity by radioactivity ( ,  and  ) and species (gases, …) Dose rate During irradiation and after decay time

Converter and target calculation U Target density2.3 g/cm 3 11 g/cm 3 Total activity (Bq) Total activity (Bq) after 1 year  activity (Bq) Tritium activity (Bq)  Dose rate (µSv/h at 1 m)  Dose rate (µSv/h at 1 m) after 1 year

Converter Plug

Containment of volatile radioactivity

Gases production Noble gases and elements with T boiling > 2000°C Define decay time for the releast Time after beam shut (month) 0112 Activity gases (Bq)

Neutron production

General siting