Measurement of solar UVB exposures in sea water with a high exposure dosimeter

Schouten, Peter and Parisi, Alfio and Turnbull, David J. (2008) Measurement of solar UVB exposures in sea water with a high exposure dosimeter. In: 2008 American Society for Photobiology Symposia, 20-25 Jun 2008, Burlingame, California.

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Abstract

For several decades, marine scientists have investigated the underwater ultraviolet light environment using a wide variety of spectroradiometric and radiometric equipment. These types of instruments are extremely useful for taking underwater measurements of the solar UV within a short window of time, for example recording fluctuations in UV levels caused by rapidly changing environmental parameters, like cloud cover or water turbidity. However, over long phases these spectroradiometers and radiometers become increasingly problematic to use, with high amounts of maintenance time necessary involving routine calibrations and corrections for the immersion effect. However, to supplement the short – term underwater measurements using spectroradiometers and radiometers, a new long – term dosimetric system employing Poly (2,6-dimethyl-1, 4-phenylene oxide) (PPO) film has been developed. The PPO film dosimeter has proven to be capable of measuring underwater UV dosages of at least five times that of the more commonly used polysulphone dosimeter, at a level of accuracy close to what would be expected of dosimetric measurements made in air provided that the necessary calibrations are completed correctly. This presentation details a measurement campaign made in a simulated sea water environment using a batch of PPO dosimeters set at different depths and aligned to a range of different inclinations and azimuths by means of attachment to a custom built dosimeter submersible float (DSF) unit. The results obtained from this measurement campaign were used to compute a diffuse attenuation coefficient (Kd) for the sea water. This Kd value was compared to a Kd value derived from results taken using a radiometer in the same water.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions. Only abstracts published, as made available here.
Depositing User: Assoc Prof Alfio Parisi
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 26 May 2009 10:00
Last Modified: 01 Sep 2011 02:10
Uncontrolled Keywords: UV, dosimeter, underwater, PPO, attenuation coefficient
Fields of Research (FOR2008): 09 Engineering > 0999 Other Engineering > 099902 Engineering Instrumentation
04 Earth Sciences > 0405 Oceanography > 040503 Physical Oceanography
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments
URI: http://eprints.usq.edu.au/id/eprint/4520

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