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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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Early Warning Dosimeters

(EWOs) for organic objects

The MASTER EWO dosimeters

– how they work

Terje Grøntoft, NILU

Prague 1st June 2006


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.


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.


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


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).


The spesific

EWO-S

dosimeter

Sample holder:

Portable

measurement

instrument

ALU - FMF


Memory

circuit

EWO-G

dosimeter

Grip

The generic EWO-G dosimeter

Exposure at location

1. Photospectrometer

in laboratory

2. Measurement at location


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


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:


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


EWO-G Trigger response

0.0107


5. Interpretation of the EWO-G dosimeter

Example: Musems from MASTER field test


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


Interpretation by the Acceptability – location table

Showcases: One calibration point lower than location

Centre for Sustainable Heritage. University College of London


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


- 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)


Preventive

Conservation

Strategy

based on the:

EWO-G

dosimeter measurement


MASTER-logo


-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.


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 %


EWO-G Trigger response

Showcases:

One calibration point lower than location


0.0107

EWO-G Trigger response

Showcases:

One calibration point lower than location


3. 0.0246

0.0312

(5)

(21.8)

O3 (ppb):

3.6

(6.5)

(15)

4. 0.0405


3. 0.0246

0.0312

(5)

(21.8)

O3 (ppb):

3.6

(6.5)

(15)

4. 0.0405


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