1. Characterization of scintillation blocks at Prague
Vít Vorobel

2. Outline
Clean room
Setup
Scintillators production
Some results

3. Area Scheme

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

5. 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.

6. Dust monitoring – Flow Box OFF
Class 9 ISO (< 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.

7. Dust monitoring – Flow Box ON
Class 7 ISO (< 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.

8. 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.

9. 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.

10. 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?

11. 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.

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

13. 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
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.

14. 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.

15. 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!

16. Backup

17. Clean room classification