Characterization of scintillation blocks at Prague Vít Vorobel

Outline Clean room Setup Scintillators production Some results

Area Scheme

Radio-contamination prevention Clean room personal protective equipment (coat, cap, facecloth, gloves, shoes) Dust, temperature and humidity monitor. Sticky pad at the entrance.

Radio-contamination prevention Air Conditioning Unit, DAIKIN, Split FTXR-EV1B Control of temperature and humidity. Dust filtering. Laminar Flow Box, Heraguard HPH 12/95 HEPA filters H14, efficiency >99.999% for particles 0.3 mm. Horizontal air flow. We are getting an experience with dust. Present level: Flow-Box OFF →10^6-10^7 particles 0.5 μm / m^3 Flow-Box ON → 10^3-10^4 particles 0.5 μm / m^3 Manipulations with naked blocks to be done inside the Laminar Flow Box.

Dust monitoring – Flow Box OFF Class 9 ISO (<35 200 000 particles >0.5 mm / m3). Proportions between different part. size measurements remain constant. Pattern with 24 hours period. No correlation with temperature or humidity. Concentration of the tiniest particles independent on heavy dirty.

Dust monitoring – Flow Box ON Class 7 ISO (<352 000 particles >0.5 mm / m3). Person without clean dress worsens. Cleanness recovers in 3 hours. Clean dress prevents worsening. Something happens on Saturdays. The dust level is the same everywhere in the room.

Electron Source Monoenergetic electron source - “Spectrometer” Power Suply TTi, PC controlled. 2 magnet yokes (for 2 spectrometers), low hysteresis material. 90Sr, 370MBq Coil, shielding…tiny components expected form Dubna, transport permitting needed. Spectrometer calibration Si(Li) detector, 3 mm thickness, 20 mm2. Si(Li) 5 mm, 75 mm2. 207Bi, 100 kBq. XY-table Range increased to 45 x 45 cm. Velocity 38 cm/min. Control with PC serial port.

Measurement Black Box 100 x 130 x 130 cm enough space for XY-table, “spectrometer” and 4 X-wall blocks with PMTs. PMTs 5 pieces of NEMO-3 5’ PMTs to be delivered from LSM. Delta E - Polystyren 300 μm, 2 PMTs in “OR” logic We are going to buy 100 mm PVT Eljen foil. Signal readout – Digitizer CAEN V1720, 8 channel, alternatively Amplifier + ADC.

Other material Mylar – film 12µm 16,8g/m² métallisé Alu 1 face, width: 1185m 1 roll of ~ 17-20kg 1000linear meter, MICEL Industrie Teflon tape – Czech, French Optical contact – Glycerol, Lukosan M14+M20, BC-630?

Scintillation blocks production in ENVINET - 4 X-wall blocks in Bordeaux (see Guillaume). - Other 22 X-wall blocks are made, 10 blocks will be sent from ENVINET to Bordeaux that week. - 20 Veto blocks should be ready by the end of June.

X-wall block #0000 measurement (#0001, #0002, #0003 are similar) g- spectrum subtraction method DE – coincidence method

X-wall block #0000 measurement Prague Bordeaux Source Bi 207 Spectrometer PMMA adaptor NO YES PMT Photonis XP3540, 5” NEMO-3, 5” Opt. contact Glycerol BC-630 Wrapping Teflon + Mylar Readout Amplifier+ADC Matacq digitizer Method g subtraction DE coincidence FWHM @ 1MeV 23 % 11 % Origin(s) of the difference must be identified. The setups must be as similar as possible. Urgent need for NEMO-3 PMTs and mag. spectrometer.

Readiness for blocks characterization at Prague Radio-contamination prevention “Clean” Room 2.6 x 4.3 m, entry 2.6 x 1.2 m. Dust, temperature and humidity monitor. Clean room personal protective equipment (coat, cap, facecloth, gloves, shoes). Sticky pad at the entrance. Air Conditioning Unit, DAIKIN, Split FTXR-EV1B Control of temperature and humidity. Dust filtering. Laminar Flow Box, Heraguard HPH 12/95 HEPA filters H14, efficiency >99.999% for particles 0.3 mm. Horizontal air flow. We are getting an experience with dust. Present level: Flow-Box OFF -> 10^6-10^7 particles >0.5mum, Class 9 ISO Flow-Box ON -> >10^4 particles >0.5mum, Class 7 ISO Manipulations with naked blocks to be done inside the Laminar Flow Box.

Other actions are linked to that! Measurement Black Box 100 x 130 x 130 cm enough space for XY-table, “spectrometer” and 4 X-wall blocks with PMTs. XY-table PC control, range 45 x 45 cm. PMTs 5 pieces of NEMO-3 5” PMTs were sent from LSM to Prague last week (Christian’s talk). Signal readout – Digitizer CAEN V1720, alternatively Amplifier + ADC. Monoenergetic electron source - “Spectrometer” Power Supply TTi, PC controlled. 2 magnet cores (for 2 spectrometers), low hysteresis material. 90Sr, 370MBq Coil, shielding…tiny components expected form Dubna – paper work needed. Spectrometer calibration Si(Li) detector, 3 mm thickness, 20 mm2, 5 mm x 75 mm^2 207Bi. Other material Mylar – 12µm 16,8g/m² métallisé Alu 1 face, width: 1185m, MICEL Industrie Teflon tape – Czech Optical contact – Glycerol, Lukosan M14+M20, BC-630 BOTTLENECK !!! Other actions are linked to that!

Backup

Clean room classification