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Inventory of radioactive sources present in the cavern at pit 8

Inventory of radioactive sources present in the cavern at pit 8. Gloria Corti Experimental Area Meeting 05 August 2008. HCAL sources. Hadron CALorimeter uses 2 137 Cs sources for calibration one per half detector gamma sources: nº4145RP (330 MBq) and nº4146RP (300 MBq)

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Inventory of radioactive sources present in the cavern at pit 8

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  1. Inventory of radioactive sources present in the cavern at pit 8 Gloria Corti Experimental Area Meeting 05 August 2008

  2. HCAL sources • Hadron CALorimeter uses 2 137Cs sources for calibration one per half detector • gamma sources: nº4145RP (330 MBq) and nº4146RP (300 MBq) • Notice at PZ85 and PM85 of presence of sources in UX85-B with map indicating location of garages • garage on floor of electronics platform on top of HCAL, source blocked inside • UX85-B conventional area when source in garage (≤ 0.5 µSv/h at 40 cm) Gloria Corti

  3. HCAL sources • EDMS 917876: safety manual and operational procedure for scan • Calibration scan announced at least 48 hours in advance and notices in PZ85 and PM85 • take place from 21:00 in the evening to 7:00 in the morning • Flashing panels bottom of Calorimeters stairs and top of gantry at exit of source(s) • UX85-B is a supervised area during scan for incident if source would stop during scan • Measurements confirm UX85-C is not classified AD6 HCAL platform  Maximum dose rate measured = 116 µSv/h Total integrated dose = 1.31 µSv. AD6 Cryo area  Maximum dose rate measured: 0.37 µSv/h Total integrated dose: 0.2 µSv. RESPONSIBLE: Rustem Dzhelyadin Gloria Corti

  4. ROOM DETAILS 2828/U1-A06 (6.0 x 4.0 m2) 2828/U1-A06 RADIOACTIVE SOURCE position when used in the room SAFE where the sources are stored when not used. UX85 - LOCALIZATION OF RADIOACTIVE SOURCES AT 2828/U1-A06 OT sources • OT uses 3 x 90Sr source + 1 55Fe for irradiation and scanning • gas quality and chamber response • beta sources: no. 4251RP(27 MBq)–4298RP(70MBq)–4299RP(70MBq), X-ray: no. 3398RP (9MBq) Sources kept in a safe in a locked room in UX85-A Panel on the door One beta source used in the room for gas quality with small panel Gloria Corti

  5. OT sources • EDMS 942795: safety manual and operational procedure for scan on OT frame • EDMS in preparation for irradiation on pillar • Signs in place before installation of source, 2 OT halves chambers open RESPONSIBLE: Antonio Pellegrino Gloria Corti

  6. Muon source • MUON uses 1 241Am for gas quality • alpha and low energy gamma • At the moment in gas building on the surface, will be moved in UX85-A in 2828/U1-A06 • EMDS 886019: Safety manual and operation procedure • kept in a safe, panel when in use RESPONSIBLE: Burkhard Schmidt Gloria Corti

  7. 432 241Am sources (alpha) in HPC module of the Electromagnetic Barrel Calorimeter – Not accessible no. 2946RP, 3.2 MBq on 16.10.1987 Responsible Gloria Corti 24 55Fe in TPC of Delphi – Not accessible 2909-2925RP 370 MBq on 03.09.1987 2929-2934RP, 2936RP, 2.41 MBq on 12.02.2007 Responsible Philippe Charpentier DELPHI sources Gloria Corti

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