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Early Warning Dosimeters (EWOs) for organic objects

Early Warning Dosimeters (EWOs) for organic objects. The MASTER EWO dosimeters – how they work. Terje Grøntoft, NILU. Prague 1 st June 2006. The EU project MASTER :. Research partners: 1) Norwegian Institute for Air Research ( NILU ) Norway.

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Early Warning Dosimeters (EWOs) for organic objects

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  1. Early Warning Dosimeters (EWOs) for organic objects The MASTER EWO dosimeters – how they work Terje Grøntoft, NILU Prague 1st June 2006

  2. The EU project MASTER : Research partners: 1) Norwegian Institute for Air Research (NILU) Norway. 2). Centre for Sustainable Heritage (CSH-UCL) University College of London. UK. 3) Albert Ludwigs Universitet - Freiburg Materialforshungs - sentrum (ALU-FMF) Germany 4) Technical University of Crete (TUC) Dept. of Environmental Engineering, Polytechneioupolis. Greece. Museum partners - Test sites: 5) National Museum in Krakow. Poland. 6) Trøndelag Folk Museum, Trondheim, Norway 7) Historic Royal Palaces, London. UK 8) The National Trust, Bury St. Edmunds. UK 9) Württembergisches Landesmuseum, Landesstelle für Museumsbetreuung Baden Württemberg. Germany 10) Institute for Masonry and Construction Research, University of Malta.

  3. The Early Warning Organic dosimeters: Pollution and climate dosimeters for organic objects collections Contents 1. The EWO dosimeter. The initial idea. 2. What are the ”specific” and ”generic” EWO dosimeters. 3. The principle of the EWO-G(Generic) dosimeter. 4. The calibration of the generic EWO-G dosimeter 5. How to interpret the measurement result from the generic EWO-G dosimeter 6. The user requirements to the EWO dosimeter.

  4. 1. An EWO dosimeter - The initial idea. • To develop an early warning system • for organic objects. • To assess degradation of organic • objects indoors. • Should be an effect dosimeter • Should be based on end-user • identifiedneeds

  5. 2. Mounting Memory circuit 1. Production EWO-G Sensor film Spin coating EWO polymer film (ALU-FMF) Grip Glass substrate 1 cm 3. Exposure 4. Analysis Environment Light absorption • 3 months 2. The EWO dosimeters A transparent organic polymer (EWO-G) with a dye indicator (EWO-S).

  6. The spesific EWO-S dosimeter Sample holder: Portable measurement instrument ALU - FMF

  7. Memory circuit EWO-G dosimeter Grip The generic EWO-G dosimeter Exposure at location 1. Photospectrometer in laboratory 2. Measurement at location

  8. Effect of the environment on the EWO-G Light- abs. Photo- spectrometric measurement Exposure effect 340 nm  (nm) 3. The principle of the EWO-G dosimeter

  9. EWO 3U B(C) EWO 3U B(C) Measured response Predicted from calibration 4. The calibration of the EWO-G dosimeter Statistical treatment of field test data using multiple regression:

  10. EWO-G effect = 0.75 NO2 + 1.34 O3 + 0.51 T + 0.35 UV (ppb) (ppb) (oC) (mWm-2) Increasing deterioration 1 1.15 1 19.3 Calibration equation: Trigger values for environmental parameters and for the EWO-G. Centre for Sustainable Heritage. University College of London

  11. EWO-G Trigger response 0.0107

  12. 5. Interpretation of the EWO-G dosimeter Example: Musems from MASTER field test

  13. 3. 0.0246 0.0312 (5) (21.8) O3 (ppb): 3.6 (6.5) (15) 4. 0.0405 The measurement result (#)= calibration values – level 3

  14. Interpretation by the Acceptability – location table Showcases: One calibration point lower than location Centre for Sustainable Heritage. University College of London

  15. 6. The end-user requirements to the EWO dosimeter. • Visible change • Yes (indirectly) • Easy to use • Yes (?) • Easy to interpret • Yes (?) • Cheap • (?) • Inert • Yes • Small • Yes

  16. - Durable - Yes • Short-term and long term options • Yes (partly) • Range of sensor sensitivities • Yes (High to medium) - Able to relate to other kinds of monitoring • Generic: Depends on data available • Specific: Yes • A diagnostic element to the sensor. • Generic dosimeter: Yes - dependent on • knowledge about environment • Specific dosimeter: Yes - All environmental risks to be monitored - No ( visible light(LUX) and organic acids)

  17. Preventive Conservation Strategy based on the: EWO-G dosimeter measurement

  18. MASTER-logo

  19. -2 Calibration intervals for environmental parameters EWO-G effect = 0.75(0.17)NO2 + 1.34(0.30)O3 + 0.51(0.088)T + 0.35(0.21)UV (#)= Uncertainty, 95 % significance level.

  20. Protection = 97.5 % Point 1: 0.0107 Trigger values for the EWO-G dosimeter O3 = 1 ppb, UV = 1 mW m-2 T = 19.3 oC RH = 55 %

  21. EWO-G Trigger response Showcases: One calibration point lower than location

  22. 0.0107 EWO-G Trigger response Showcases: One calibration point lower than location

  23. 3. 0.0246 0.0312 (5) (21.8) O3 (ppb): 3.6 (6.5) (15) 4. 0.0405

  24. 3. 0.0246 0.0312 (5) (21.8) O3 (ppb): 3.6 (6.5) (15) 4. 0.0405

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