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Decommissioning of the accelerator park INW
from the Ghent University Myriam Monsieurs, Isabelle Meirlaen, Hubert Thierens
Ghent University, Health Physics Department
Sven Boden, Luc Noynaert, Luc Ooms,
SCK•CEN, Dismantling & Decontamination Unit
Karel Strijckmans
Ghent University, Department of Analytical Chemistry
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
Introduction
• Decommissioning plan: contains info about inventory,
estimation of amounts of waste,…
→ strategy, total cost assessment
• Important factor : degree of activation
→ radiological characterization
• SCK•CEN, Decommissioning & Decontamination Unit
→ inventory of all metal components
→ radiological characterization of concrete structure
of cyclotron
→ decommissioning plan & safety report
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
Accelerator park
• Location of the accelerator park
• Installations to dismantle
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
UZ Gent
E17
UGent-INW
AA Gent
Location in Ghent
Schelde
railroad
Bestralingsruimte (IIA)
Afvallokalen kl II
cyclotron (IIA)
LINAC’s en Van de
Graaf
Laboratoria (II en III)
Meetzone (kl II)
D/T generator
N8 N3
N4
Location on the INW-site
1. Cyclotron
Cyclotron CGR type 520
→ polemagnet ᴓ 120 cm, 28 t
→ multiparticle :
• p+ (2,5 - 24 MeV)
• 2H (3 - 14,5 MeV)
• 3He (6 - 32 MeV)
• α (10 - 29 MeV)
Cyclotron
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
→ Operational: 1977 – 2006
• 7-10h/day
• 40-45 weeks/year
→ 1977 – 1982 : 3 beamlines
→ 1982 : + 3 beamlines & hotlab
→ Used for research in
radiochemistry
Cyclotron
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
Kazemat:
Cyclotron CGR 520
Alveole 1:
1977 – 1982: PET → 11C
1979 – 1984: FNAA
1982 – 2006: CPAA
Alveole 2:
1982 – 2006: PIXE
Alveole 3:
1977 – 1982 (1 beamline): CPAA
1982 – 2006 (3 beamlines): isotope production → 11C, 18F, 15O
BetonBlokken
3,7 m
hoog
BetonBlokken
5,6m hoog
BetonBlokken
2 m hoog
100.046Alveole 1
100.047Alveole 2
100.048Alveole 3
100.038
Alveole 4
100.030Alveole 5
100.054Kazemat
kazemat
Alveole 1
Alveole 2
Alveole 3
Cyclotron
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
Alveole 4: Isotope production → 81Rb/81mKr
Alveole 5: Neutron therapy unit
Mostly used for experimental
neutron irradiation.
Hotlab: preparation radiopharma
→ 6 hotcells and 4 fume hoods
BetonBlokken
3,7 m
hoog
BetonBlokken
5,6m hoog
BetonBlokken
2 m hoog
100.046Alveole 1
100.047Alveole 2
100.048Alveole 3
100.038
Alveole 4
100.030Alveole 5
100.054Kazemat
Cyclotron
2006: Final shutdown
Equipment → largely intact and still in place
Only small loose parts
and some peripheral
equipment
→ removed
Cyclotron
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
Bestralingsruimte (IIA)
Afvallokalen kl II
cyclotron (IIA)
LINAC’s en Van de
Graaf
Laboratoria (II en III)
Meetzone (kl II)
D/T generator
N3
LINAC’s & Van de Graaff
2. 90 MeV LINAC
→ Operational: 1975 – 1995
• 60 000 h
• 30 – 70 MeV
→ Components:
• electron gun
• 2 accelerator sections
• Positronconvertor
• beam transportsystem
• peripheral equipment
90 MeV LINAC
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
→ Used for: Nuclear Physics research
→ Today: disassembled
• (possibly) activated parts
→ stored
• peripheral equipment
→ removed
90 MeV LINAC
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
15 MeV LINAC
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
3. 15 MeV LINAC
→ Operational: 1986 – 2008
• 50 000 h
• max 10 MeV
→ Components:
• electron gun
• 2 accelerator sections
• beam transportsystem
• peripheral equipment
15 MeV LINAC
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
→ Used for:
• before ‘97: Fundamental Nuclear Physics
research
• after ’95: Applied multidisciplinary research
→ Today: partially disassembled
• beam transport system → in place
• electron canon + 2 beamline sections →
stored
• peripheral equipment → removed
• shielding → re-used on site
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
4. 2 MeV Van de Graaf accelerator
→ Operational: 03/12/1999
→ 22Na source was damaged
during first start-up of accelerator
→ Decontamination: 04/04/2000
→ Accelerator was never used again
→ Today: disassembled
• contaminated section → stored
• not contaminated parts → donated
to scientific history museum UGent
Van de Graaff
5. Other accelerator parts
→ 2 sections LINAC Rozier (UGent < 1975)
→ 2 sections IRMM
Other parts
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
Bestralingsruimte (IIA)
Afvallokalen kl II
cyclotron (IIA)
LINAC’s en Van de
Graaf
Laboratoria (II en III)
Meetzone (kl II)
D/T generatorN4
D/T generator
6. 14 MeV Neutron generator type J (Sames) 2H particles accelerated up to 150 keV to a 3H target
→ quasi mono-energetic 14 MeV neutrons
Water-cooled 3H target (Nukem, D; 2,8 1011 Bq in 1970)
Neutron flux: 109 n cm-2
→ Operational: 1960 – 1980
→ Today:
• Largely intact
• Stored in place
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht
D/T generator
Radiological characterization of the UGent
cyclotron in view of its dismantling
Sven Boden & Luc Ooms (Dismantling & Decontamination Unit, SCK•CEN)
[email protected], [email protected]
Isabelle Meirlaen, Myriam Monsieurs, Hubert Thierens & Karel Strijckmans (UGent) [email protected], [email protected], [email protected], [email protected]
Mini-workshop “Radiological Characterization of Cyclotrons for Dismantling”, January 25th, 2016, BEL V, Anderlecht