Document Detail

Stray light correction on array spectroradiometers for optical radiation risk assessment in the workplace.
MedLine Citation:
PMID:  25379738     Owner:  NLM     Status:  Publisher    
The European directive 2006/25/EC requires the employer to assess and, if necessary, measure the levels of exposure to optical radiation in the workplace. Array spectroradiometers can measure optical radiation from various types of sources; however poor stray light rejection affects their accuracy. A stray light correction matrix, using a tunable laser, was developed at the National Institute of Standards and Technology (NIST). As tunable lasers are very expensive, the purpose of this study was to implement this method using only nine low power lasers; other elements of the correction matrix being completed by interpolation and extrapolation. The correction efficiency was evaluated by comparing CCD spectroradiometers with and without correction and a scanning double monochromator device as reference. Similar to findings recorded by NIST, these experiments show that it is possible to reduce the spectral stray light by one or two orders of magnitude. In terms of workplace risk assessment, this spectral stray light correction method helps determine exposure levels, with an acceptable degree of uncertainty, for the majority of workplace situations. The level of uncertainty depends upon the model of spectroradiometers used; the best results are obtained with CCD detectors having an enhanced spectral sensitivity in the UV range. Thus corrected spectroradiometers require a validation against a scanning double monochromator spectroradiometer before using them for risk assessment in the workplace.
A Barlier-Salsi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-07
Journal Detail:
Title:  Journal of radiological protection : official journal of the Society for Radiological Protection     Volume:  34     ISSN:  1361-6498     ISO Abbreviation:  J Radiol Prot     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-7     Completed Date:  -     Revised Date:  2014-11-8    
Medline Journal Info:
Nlm Unique ID:  8809257     Medline TA:  J Radiol Prot     Country:  -    
Other Details:
Languages:  ENG     Pagination:  915-930     Citation Subset:  -    
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