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05-Oct-02 L. Moritz TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T2A3 SAFERIB Workshop CERN, Oct.30-Nov.1,

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Presentation on theme: "05-Oct-02 L. Moritz TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T2A3 SAFERIB Workshop CERN, Oct.30-Nov.1,"— Presentation transcript:

1 05-Oct-02 L. Moritz TRIUMF 4004 Wesbrook Mall Vancouver, B.C. V6T2A3 Lutz.moritz@triumf.ca Radiation.Safety@ISAC SAFERIB Workshop CERN, Oct.30-Nov.1, 2002Safety@ISAC

2 05-Oct-02 Overview  Short description of ISAC  Shielding (tools and verification)  Activation (yields and distribution)  Target handling  Contamination control  Experience and plans for future

3 05-Oct-02 ISAC Parameters Reference Design: 100  A of 500 MeV protons on 95 g cm -2 UC 2 Reference Design: 100  A of 500 MeV protons on 95 g cm -2 UC 2 Authorization: 100  A of 500 MeV protons on targets Z  82 Authorization: 100  A of 500 MeV protons on targets Z  82 Application for targets with Z > 82 in preparation Ottawa

4 05-Oct-02 Targets (to September 2002) Targett (g cm -2 )Max. I p (  A)  I p dt (  A  h) CaO36.0<1070 CaO31.1<10363 Nb11.1103242 Nb11.5209063 Mo89.2100  197 Ta21.3203516 CaZrO 3 42.321357 SiC7.4102155 Nb22.0403766 Ta43.64017279 SiC29.91516010 SiC18.930 TiC37.140 Test only

5 05-Oct-02 ISAC at TRIUMF http://www.triumf.ca/isac/is9-00-t.jpg

6 05-Oct-02 ISAC Experimental Hall

7 05-Oct-02 ISAC-II (2005)

8 05-Oct-02 ISAC Target Stations 500 MeV Protons RIB Initial Installation: West Target Station Initial Installation: West Target Station Installation 2002: East Target Station

9 05-Oct-02 Shielding  Bulk Shielding: Point source, line-of- sight attenuation  Complicated geometries: FLUKA  Verification: MCNP, LCS

10 05-Oct-02 Point Source, Line-of-sight Attenuation of Prompt Radiation Field Nuclear interaction probability High-energy neutron yield Angular dependence Exponential Attenuation Geometry factor

11 05-Oct-02 Parameters f n (E p ), h 0,,  Nuclear interaction probability, f n Angular dependence,  Attenuation length, Attenuation length, Source term, h 0 m=0.8

12 05-Oct-02 Test: 500 MeV Proton Beam Stop 1.8 m 2.9 m

13 05-Oct-02 ISAC Target Shielding (Plan) Steel Concrete (low Na) Radioactive Ion beam Slits Cu Beam dump Target Proton beam Concrete A A’

14 05-Oct-02 ISAC Target/ion Source Shielding ion beam steel 0 1m concrete concrete & steel Service space recycled steel target vacuum seals (Section AA’)

15 05-Oct-02 Streaming Through Pre- separator Maze Target: 50 g cm -2 UC 2 E p = 500 MeV I p = 100  A FLUKA simulation

16 05-Oct-02 Pre-separator Maze Added shielding Before After

17 05-Oct-02 ISAC Target Module

18 05-Oct-02 Target Module Service Ducts Target/Ion Source

19 05-Oct-02 Sv/h Streaming Through Target Vacuum Exhaust Ducts Target: 50 g cm -2 UC 2 E p = 500 MeV I p = 100  A p Air Concrete- steel

20 05-Oct-02 Streaming Through Ducts Concrete- steel Air

21 05-Oct-02 Composition of Top Shield

22 05-Oct-02 Radiation Fields above Target 350400200 105 140170200 115  Sv/h 1 10 100 1000 Andersson-Braun Measurement 100  A on Mo Target Test Andersson-Braun Measurement 100  A on Mo Target Test

23 05-Oct-02 Activation  Experimental Cross-sections  Silberberg & Tsao  FLUKA, LAHET, MCNPX  ORIGEN

24 05-Oct-02 238 U(p,x) Cross Section Comparison at 500 MeV LCSFLUKAExperimentalSilberberg & Tsao ………… Fission Spallation Peripheral

25 05-Oct-02 Silberberg & Tsao (YIELDX) 500 MeV Protons

26 05-Oct-02 FLUKA Simulation (500 MeV protons on UC 2 target) 18 cm 1.4 cm UC 2 (5.076 g cm -3 ) 67 mm UC 2 (5.076 g cm -3 ) Ta H2OH2O 27 mm p p

27 05-Oct-02 Yields: UC 2 target (FLUKA simulation) 18 cm 1.4 cm UC 2 (5.076 g cm -3 ) 500 MeV p

28 05-Oct-02 ORIGEN (build-up and decay) Beam OnBeam Off

29 05-Oct-02 Decays Leading to 210 Po 210 Po Long-lived Not in ORIGEN Library

30 05-Oct-02 ISAC Target Handling Target Maintenance Hall

31 05-Oct-02 Maximum  -field Outside ITMH ~10 Sv/h @ 1 m  1  Sv/h

32 05-Oct-02 ISAC Target Servicing: Hot Cells Target storage pit Hot Cells Target storage pit

33 05-Oct-02 ISAC target hot cell roof docking mechanism

34 05-Oct-02 ISAC target being docked in hot cell

35 05-Oct-02 ISAC Hot Cells Before Installation of Windows

36 05-Oct-02 View Through ISAC Hot Cell Window

37 05-Oct-02 Contamination Control  Ventilation System  Production of Radioactivity in Air  Typical Release Rates  Production of Volatile Radioactivity  Vacuum Exhaust Handling

38 05-Oct-02 Ventilation System Hot Cell Service Room Hot Cell Target Service Space Presep. Cave Mass Separator Room Experimental Hall Services Target Maintenance Hall Fan Standby Fan Secondary Filters Primary Filters Air pressure depression relative to outside Stack

39 05-Oct-02 Radioactivity Production in Air

40 05-Oct-02 Production in Pre-separator Vault Nuclide Production rateRelease rate (s -1 )(Bq a -1 )(%DRL) 3H3H7.8x10 6 1.5x10 5 1.2x10 -10 7 Be7.4x10 5 1.2x10 6 1.0x10 -7 11 C1.5x10 6 8.6x10 9 9.5x10 -5 13 N5.8x10 6 6.9x10 10 6.3x10 -4 15 O2.3x10 6 1.0x10 11 1.7x10 -3 41 Ar1.9x10 6 2.1x10 9 2.8x10 -5 Total1.8x10 11 2.4x10 -3 (3000 hours per year, 100  A on 238 UC 2 target)

41 05-Oct-02 Production in Target Service Space (3000 hours per year, 100  A on 238 UC 2 target) Nuclide Production rateRelease rate (s -1 )(Bq a -1 )(%DRL) 3H3H9.5x10 4 1.8x10 3 1.4x10 -12 7 Be2.2x10 4 3.6x10 4 3.0x10 -9 11 C4.6x10 4 2.7x10 8 3.0x10 -6 13 N1.1x10 5 1.3x10 9 1.2x10 -5 15 O4.8x10 4 2.4x10 9 1.6x10 -5 41 Ar3.6x10 6 4.1x10 9 5.5x10 -5 Total8.1x10 9 1.1x10 -4

42 05-Oct-02 Releases to Atmosphere (Gaseous, 2001) IsotopeTotal Release (MBq)DRL (MBq)% of DRL 127 Xe3.4  10 0 3.7  10 10 8.8  10 -9 41 Ar+  + 5.0  10 -3

43 05-Oct-02 Production of Volatiles Target Hg I/Xe Rb/Kr Cl/Ar Ne b+b+ volatiles

44 05-Oct-02 Vacuum Exhaust System HEPA filter Charcoal filter Operating storage Long-term storage Pre-separator Mass-separator TIS Exit modules TP MP Secondary Primary Slits

45 05-Oct-02 Releases to Atmosphere (Particulates, 2001) IsotopeTotal Release (MBq)DRL (MBq)% of DRL 77 Br1.3  10 3 3.4  10 9 3.8  10 -5 75 Se2.7  10 0 2.9  10 7 9.3  10 -6 54 Mn4.3  10 -1 1.3  10 7 3.3  10 -6 126 I2.7  10 -1 1.1  10 7 2.4  10 -6 137 Cs4.7  10 -1 2.7  10 7 1.7  10 -6 82 Sr1.7  10 0 1.1  10 8 1.5  10 -6 82 Br4.5  10 0 6.0  10 8 7.5  10 -7 124 I2.3  10 -1 3.7  10 7 6.3  10 -7 57 Co2.3  10 -1 1.0  10 8 2.3  10 -7 95 Nb2.7  10 0 1.2  10 8 2.2  10 -6 123 I1.4  10 3 5.7  10 9 2.4  10 -5 Total2.5  10 3 8.5  10 -5

46 05-Oct-02 Experience  Contamination Issues  Collective Dose

47 05-Oct-02 One (!) Contamination Incident (June 2000) Target Station Hot Cell Nb target Ta target NuclideBq cm -2 83 Rb0.16 75 Se0.04 85 Sr0.42 169 Yb0.03 Total0.66 1 2 No contamination after step 1 Uniform contamination after step 1 No other significant contamination since June 2000 No other significant contamination since June 2000

48 05-Oct-02 TRIUMF Collective Dose So far ISAC has had no significant impact on TRIUMF collective dose Start of ISAC operation

49 05-Oct-02 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 05-Oct-02 Conceptual Design of Proposed Test Station

51 05-Oct-02

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