Inventory of radioactive sources present in the cavern at pit 8

Gloria Corti

Experimental Area Meeting

05 August 2008

LHCb Experimental Area Meeting - 05 August 2008 Gloria Corti

Page 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)

LHCb Experimental Area Meeting - 05 August 2008 Gloria Corti

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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

LHCb Experimental Area Meeting - 05 August 2008 Gloria Corti

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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)

2828/U1-A06

2828/U1-A06(6.0 x 4.0 m2)

RADIOACTIVE SOURCEposition when used in the

room

ROOM DETAILS

UX85 - LOCALIZATION OF RADIOACTIVE SOURCES AT 2828/U1-A06

SAFE where the sources are stored when not used.

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

LHCb Experimental Area Meeting - 05 August 2008 Gloria Corti

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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

LHCb Experimental Area Meeting - 05 August 2008 Gloria Corti

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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

LHCb Experimental Area Meeting - 05 August 2008 Gloria Corti

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DELPHI sources

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