MASTER EVK4-CT The MASTER EWO dosimeters – how they work Prague 1 st June 2006 Terje Grøntoft, NILU

MASTER EVK4-CT 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.

MASTER EVK4-CT 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.

MASTER EVK4-CT An EWO dosimeter - The initial idea. - To develop an early warning system for organic objects. - Should be an effect dosimeter - Should be based on end-user identified needs - To assess degradation of organic objects indoors.

MASTER EVK4-CT A transparent organic polymer (EWO-G) with a dye indicator (EWO-S). 2. Mounting Memory circuit EWO-G Sensor film Grip 1. Production Spin coating Glass substrate EWO polymer film (ALU-FMF) 1 cm 4. Analysis Light absorption 3. Exposure Environment - 3 months 2. The EWO dosimeters

MASTER EVK4-CT The spesific EWO-S dosimeter Sample holder: Portable measurement instrument ALU - FMF

MASTER EVK4-CT The generic EWO-G dosimeter Exposure at location 1. Photospectrometer in laboratory 2. Measurement at location Memory circuit EWO-G dosimeter Grip

MASTER EVK4-CT Effect of the environment on the EWO-G (nm) Light- abs. 340 nm Photo- spectrometric measurement Exposure effect 3. The principle of the EWO-G dosimeter

MASTER EVK4-CT EWO 3U B(C) Predicted from calibration Measured response 4. The calibration of the EWO-G dosimeter Statistical treatment of field test data using multiple regression:

MASTER EVK4-CT Calibration equation: Centre for Sustainable Heritage. University College of London Trigger values for environmental parameters and for the EWO-G. (ppb) ( o C)(mWm -2 ) EWO-G effect = 0.75 NO O T UV Increasing deterioration

MASTER EVK4-CT EWO-G Trigger response

MASTER EVK4-CT Example: Musems from MASTER field test 5. Interpretation of the EWO-G dosimeter

MASTER EVK4-CT (#) = calibration values – level 3 The measurement result (5) O 3 (ppb): 3.6 (6.5) (15) (21.8)

MASTER EVK4-CT Interpretation by the Acceptability – location table Centre for Sustainable Heritage. University College of London Showcases: One calibration point lower than location

MASTER EVK4-CT The end-user requirements to the EWO dosimeter. - Easy to use - Easy to interpret - Visible change - Cheap - Inert - Small - Yes (?) - Yes (indirectly) - (?) - Yes

MASTER EVK4-CT Short-term and long term options - Range of sensor sensitivities - Able to relate to other kinds of monitoring - A diagnostic element to the sensor. - All environmental risks to be monitored - Yes - Yes (partly) - Yes (High to medium) -Generic: Depends on data available -Specific: Yes - Generic dosimeter: Yes - dependent on knowledge about environment Specific dosimeter: Yes - No (  visible light(LUX) and organic acids) - Durable

MASTER EVK4-CT Preventive Conservation Strategy based on the: EWO-G dosimeter measurement

MASTER EVK4-CT MASTER-logo

MASTER EVK4-CT EWO-G effect = 0.75(0.17)NO (0.30)O (0.088)T (0.21)UV Calibration intervals for environmental parameters -2 (#) = Uncertainty, 95 % significance level.

MASTER EVK4-CT Trigger values for the EWO-G dosimeter Protection = 97.5 % Point 1: O 3 = 1 ppb, UV = 1 mW m -2 T = 19.3 o C RH = 55 %

MASTER EVK4-CT EWO-G Trigger response Showcases: One calibration point lower than location

MASTER EVK4-CT

MASTER EVK4-CT EWO-G Trigger response Showcases: One calibration point lower than location

MASTER EVK4-CT (5) O 3 (ppb): 3.6 (6.5) (15) (21.8)

MASTER EVK4-CT (5) O 3 (ppb): 3.6 (6.5) (15) (21.8)