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Radiation. Safety@ISAC SAFERIB Workshop CERN, Oct.30-Nov.1, 2002

Radiation. Safety@ISAC SAFERIB Workshop CERN, Oct.30-Nov.1, 2002. L. Moritz TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T2A3 Lutz.moritz@triumf.ca. Overview. Short description of ISAC Shielding (tools and verification) Activation (yields and distribution) Target handling

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Radiation. Safety@ISAC SAFERIB Workshop CERN, Oct.30-Nov.1, 2002

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  1. Radiation.Safety@ISACSAFERIB WorkshopCERN, Oct.30-Nov.1, 2002 L. Moritz TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T2A3 Lutz.moritz@triumf.ca

  2. Overview • Short description of ISAC • Shielding (tools and verification) • Activation (yields and distribution) • Target handling • Contamination control • Experience and plans for future

  3. ISAC Parameters Reference Design: 100 A of 500 MeV protons on 95 g cm-2 UC2 Authorization: 100 A of 500 MeV protons on targets Z  82 Application for targets with Z > 82 in preparation Ottawa

  4. Targets (to September 2002) Test only

  5. ISAC at TRIUMF http://www.triumf.ca/isac/is9-00-t.jpg

  6. ISAC Experimental Hall

  7. ISAC-II (2005)

  8. ISAC Target Stations RIB Initial Installation: West Target Station Installation 2002: East Target Station 500 MeV Protons

  9. Shielding • Bulk Shielding: Point source, line-of- sight attenuation • Complicated geometries: FLUKA • Verification: MCNP, LCS

  10. Point Source, Line-of-sight Attenuation of Prompt Radiation Field Nuclear interaction probability Geometry factor High-energy neutron yield Exponential Attenuation Angular dependence

  11. Parameters fn(Ep), h0,,  Nuclear interaction probability, fn Source term, h0 m=0.8 Angular dependence,  Attenuation length, 

  12. Test: 500 MeV Proton Beam Stop 1.8 m 2.9 m

  13. ISAC Target Shielding (Plan) Concrete (low Na) Radioactive Ion beam Concrete Steel Slits A Cu Beam dump A’ Target Proton beam

  14. 0 1m ISAC Target/ion Source Shielding concrete & steel (Section AA’) Service space concrete vacuum seals steel steel steel target ion beam recycled steel

  15. FLUKA simulation Streaming Through Pre-separator Maze Target: 50 g cm-2 UC2 Ep = 500 MeV Ip = 100 mA

  16. Before Pre-separator Maze Added shielding After

  17. ISAC Target Module

  18. Target Module Service Ducts Target/Ion Source

  19. Sv/h Streaming Through Target Vacuum Exhaust Ducts Concrete- steel Air Target: 50 g cm-2 UC2 Ep = 500 MeV Ip = 100 mA steel p

  20. Streaming Through Ducts Concrete- steel Air

  21. Composition of Top Shield

  22. Sv/h 1000 350 400 200 105 100 10 140 170 200 115 1 Radiation Fields above Target Andersson-Braun Measurement 100 A on Mo Target Test

  23. Activation • Experimental Cross-sections • Silberberg & Tsao • FLUKA, LAHET, MCNPX • ORIGEN

  24. 238U(p,x) Cross Section Comparison at 500 MeV ………… Silberberg & Tsao LCS FLUKA Experimental Spallation Fission Peripheral

  25. Silberberg & Tsao (YIELDX) 500 MeV Protons

  26. FLUKA Simulation (500 MeV protons on UC2 target) UC2 (5.076 g cm-3) H2O p 67 mm 27 mm Ta 18 cm p 1.4 cm UC2 (5.076 g cm-3)

  27. Yields: UC2 target (FLUKA simulation) 18 cm 500 MeV p 1.4 cm UC2 (5.076 g cm-3)

  28. ORIGEN (build-up and decay) Beam On Beam Off

  29. Decays Leading to 210Po 210Po Long-lived Not in ORIGEN Library

  30. ISAC Target Handling Target Maintenance Hall

  31. Maximum g-field Outside ITMH ~10 Sv/h @ 1 m 1 mSv/h

  32. ISAC Target Servicing: Hot Target storage pit Cells Target storage pit Hot Cells

  33. ISAC target hot cell roof docking mechanism

  34. ISAC target being docked in hot cell

  35. ISAC Hot Cells Before Installation of Windows

  36. View Through ISAC Hot Cell Window

  37. Contamination Control • Ventilation System • Production of Radioactivity in Air • Typical Release Rates • Production of Volatile Radioactivity • Vacuum Exhaust Handling

  38. Secondary Filters Primary Filters Ventilation System Stack Air pressure depression relative to outside Fan Standby Fan Target Service Space Presep. Cave Mass Separator Room Experimental Hall Services Hot Cell Service Room Hot Cell Target Maintenance Hall

  39. Radioactivity Production in Air

  40. Production in Pre-separator Vault (3000 hours per year, 100mA on 238UC2 target)

  41. Production in Target Service Space (3000 hours per year, 100 A on 238UC2 target)

  42. Releases to Atmosphere (Gaseous, 2001)

  43. Production of Volatiles Cl/Ar b+ Ne Target I/Xe Hg Rb/Kr volatiles

  44. MP Vacuum Exhaust System MP TP TIS MP HEPA filter TP TP Exit modules TP Operating storage Charcoal filter TP TP Pre-separator Secondary Slits Primary MP TP Mass-separator Long-term storage

  45. Releases to Atmosphere (Particulates, 2001)

  46. Experience • Contamination Issues • Collective Dose

  47. One (!) Contamination Incident(June 2000) Hot Cell Target Station Nb target 1 Ta target 2 No contamination after step 1 Uniform contamination after step 1 No other significant contamination since June 2000

  48. TRIUMF Collective Dose So far ISAC has had no significant impact on TRIUMF collective dose Start of ISAC operation

  49. Future Plans • Task Force to pursue licensing for actinide targets • Proposed test station to measure yields and transport properties of alpha-emitters • Proposed second proton beam line to feed second target station

  50. Conceptual Design of Proposed Test Station

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