RADIOACTIVE ION BEAMS AT

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

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

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GANIL

• Stable beams
• from C to U
• Maximum energy 95 AMeV
• Intensity 2.1013 pps (6 kW)
• RIB production
• in-flight method SISSI and LISE
• ISOL method SPIRAL I (SIRa)

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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

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SPIRAL I cave
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SPIRAL I target source
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Activation and Dose rate calculation (EPAX)
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Dose rate measurement
calculation
Calculation measure
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Cooling water activation

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

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Radioactive release

• Normal conditions
• Air activation by neutrons (radioactive gases
  short life)
• Storage of gases from vacum system
• Accidents
• ? Air Ventilation system with high efficiency
  filtre
• Impact of the SPIRAL facility 0.06 µSv/year

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Airborne activation
neutron
Air activity
A max 4.107 Bq/m3 (gaz) and 60 Bq/m3 (aerosol)
for 1.5 kW 13C 75 AMeV beam After beam shut
traces (1 Bq/cm2)
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LINAG project
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Goals

• Production of RIBs from fission products using
  ISOL method
• Deuterons beam 40 MeV, 5 mA (200 kW)
• C converter for neutron production
• UCx production target gt 1013 fissions/s
• Irradiation time 3 months

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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

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Converter and target calculation
U Target density 2.3 g/cm3 11 g/cm3
Total activity (Bq) 6.77 1013 3.64 1014
Total activity (Bq) after 1 year 1.44 1011 6.88 1011
? activity (Bq) 7.10 106 4.28 107
Tritium activity (Bq) 4.28 106 3.76 108
? Dose rate (µSv/h at 1 m) 6.83 106 3.20 107
? Dose rate (µSv/h at 1 m) after 1 year 6.76 103 3.39 104
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Converter Plug
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Containment of volatile radioactivity
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Gases production

• Noble gases and elements with T boiling gt 2000C
• Define decay time for the releast

Time after beam shut (month) 0 1 12
Activity gases (Bq) 2.51 1013 6.9 1010 2.8 1010
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Neutron production
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General siting