Report from Turku. Scanditronix Cyclotron Workshop Uppsala 23-25th May Stefan Johansson

Transcription

1 Report from Turku Stefan Johansson Åbo Akademi University Accelerator laboratory Turku Finland Scanditronix Cyclotron Workshop Uppsala 23-25th May 2018 Turku PET Centre University of Turku Åbo Akademi University Turku University Hospital

2 Turku PET Centre Organisation Åbo Akademi University, Cyclotrons Turku University, Radiochemistry Turku University Central Hospital, Imaging Åbo Akademi, Cyclotrons and Targetry 1 Physisist 2 Chemists 1 Engineer 1 Technichian Turku PET Centre University of Turku Åbo Akademi University Turku University Hospital

3 Åbo Akademi Univ. Gadolinia Building MGC-20 Campus CC 18/9 and TR19 Turku PET Centre Cyclone 3 Medi City Turku PET Centre University of Turku Åbo Akademi University Turku University Hospital

4 MGC-20 TPC cyclotrons Cyclone 3D TR19 Turku PET Centre CC18/9 University of Turku Åbo Akademi University Turku University Hospital

5 TPC Cyclotrons MGC-20 Cyclon 3D CC18 / 9 TR 19 Protons H 2+ Ions 3-20 MeV 18 MeV MeV MeV Deuterons 3 Helium α- Particles MeV 8-29 MeV MeV 3.5 MeV 9 MeV

6 TPC Cyclotrons MGC-20 Cyclone 3d CC18/9 TR19 Pole diameter 103 cm 50 cm 110 cm 114 cm Magnet weight kg kg kg kg Frequency MHz 12.2 MHz 38.2 MHz 74.2 MHz Harmonic mode 1 and Ion Source Internal Internal External External Type Livingston Hot filament P.I.G. Cold filament Multicusp Multicusp Extraction Deflector Deflector Carbon foil Carbon foil Beam intensity 50 µa (300 µa*) 50 µa 100 µa 230 µa Targets * Internal beam

7 Cyclotron statistics 2017 Cyclotron Beam hours on target Numbers of Irradiations MGC Cyclone 3D ~ ** CC18/9 * TR19 * * Installation of new hotcells, no irradiations between ** Number of patients

8 Targets 18 F Volume Max current Pressure Yield in 1hour Foil Body MGC ml 10 µa * 35 GBq AISI 321 Ag CC18/9 2.2 ml 30 µa (40 µa) ** 40 bar 60 GBq AISI 321 Nb TR19 5 ml 100 µa 8.2 bar 240 GBq Havar Nb 11 CO 2 Length Max current Pressure Yield in 20 min. Foil Body MGC mm 12 µa * 42 bar AISI 321 Al CC18/9 100 mm 30 µa (40 µa) ** 73 bar 78 GBq AISI 321 Al TR mm 40 µa 44 bar 120 GBq Havar Al 11 CH 4 Lenght Max current Pressure Yield in 20 min Temperature Foil Body MGC mm 12 µa * 40 bar 50 ºC AISI 321 Al CC18/9 100 mm 30 µa (40 µa) ** 80 bar 75 GBq 60 ºC AISI 321 Al TR mm 40 µa 38 bar 65 GBq 60 ºC Havar Al * Beam wobbling and helium cooling ** Grid support of target foils 75% trancparency, no helium cooling and beam wobbling Collimator 10 mm on all targets

9 Extension of the radiochemistry laboratory 7 new hotcells in cleen room All together 13 hotcells for production and 4 hotcells for reasearch

10 Dee Voltage Measurement A Si(Li) detector by DSG (Detector System GmbH) The active thickness of the detector crystal was 3 mm and the active area was 30 mm 2. The signal from the detector was amplified by a Canberra Spectroscopy Amplifier (Model 2021) and converted to digital code by a Canberra Model MHz Wilkinson ADC and sorted to a spectrum with a FAST MCD-2 multichannel analyzer card

11 Counts Deflector voltage compared to voltage measured on the Power supply Deflector Voltage Cu (Kα) 8.04 kev Cu (Kβ) 8.90 kev kv 18 kv 19 kv 20 kv 21 kv 22 kv 23 kv 24 kv 25 kv Energy [kev]

12 Counts Both dees one at a time compared to digital readouts MGC-20 Dee Voltage Left Dee 10.5 kv 10 Right Dee 14.7 kv Energy [kev]

13 Counts Actual dee voltage with 2 different digital readouts Both Dees Normal Operation kv 12 kv Energy [kev]

14 Decomissioning of the MGC-20 Cyclotron The building where the MGC-20 cyclotron is located will make place for a new campus building after 2021 when the new building for Science and Engineering will be ready. The MGC-20 cyclotron is will be in use as long we have spare parts. Ongoing planning of decommisioning - Mapping of radionuclides in walls - Neutron flux measurements - Monte Carlo simulation of neutron activation GEANT 4 - Neutron activation analysis of wall samples and magnet yoke

15 Site 4 Site 1 Site 2 Site

16 Sampling of the walls

17 Samples Activity concentrations (Bq/g) Location Sample type Co-57 Co-60 Cs-134 Eu-152 Eu-154 Fe-59 Mn-54 Na-22 Sc-46 Zn-65 K23, Site 1 Reinforcement bar K23, Site 1 Drilling sludge K23, Site 1 Core (2-9 cm) K23, Site 1 Core (9-13 cm) K23, Site 1 Core (13-20 cm) K23, Site 1 Core (20-28 cm) K23, Site 1 Core (28-31 cm) K23, Site 1 Pieces from core K22, Site 2 Drill dust K22, Site 2 Drilling sludge K22, Site 2 Core (0-7 cm) K22, Site 2 Core ( cm) K22, Site 2 Core ( cm) K22, Site 2 Core (17-25 cm) K22, Site 2 Core ( cm) K23, Site 3 Drill dust K23, Site 3 Drilling sludge K23, Site 3 Core (0-5.5 cm) K23, Site 3 Core ( cm) K23, Site 3 Core (10-18 cm) K23, Site 3 Core ( cm) K23, Site 3 Core ( cm) K22, Roof Bitumen (0-3 cm, radiation shielding) K22, Roof Bitumen (3-6 cm, radiation shielding) K22, Roof Iron profile (roof support) K22, Site 4 Reinforcement bar K22, Site 4 Drill dust K22, Site 4 Drilling sludge K22, Site 4 Core (0-3.7 cm) K22, Site 4 Core ( cm) K22, Site 4 Core ( cm) K22, Site 4 Core (12-16 cm) K22, Site 4 Core (16-20 cm) K22, Site 4 Core (20-25 cm) Detection limit Clearance level (ST 1.5)

18 Activity concentration [Bq/g Eu-152 T 1/2 =13.5y Clearance level depth [cm] Cyclotron vault Magnetite wall target positon Magnetite wall cyclotron vault Target position wall

19 Activity concentration [Bq/g] Co-60 T 1/2 =5.7y Clearance level Depth {cm] Cyclotron vault Magnetite wall target positon Magnetite wall cyclotron vault Target position wall

20 Thank you for your attention