Document Detail

A study of the directional response of ultraviolet radiometers: I. Practical evaluation and implications for ultraviolet measurement standards.
MedLine Citation:
PMID:  11008966     Owner:  NLM     Status:  MEDLINE    
The directional responses of a range of ultraviolet radiometers commonly used for irradiance measurements of UVB and UVC have been studied. Radiometers with 24 diffuser/filter combinations were assessed using a deuterium source, and three different diffuser/filter designs were assessed using a monochromatic source. The directional responses of the radiometers have been calculated and expressed in terms of figures of merit similar to those described for (photopic) illuminance meters in BS 667 and CIE 69. Those radiometers that performed best for the measurement of both small and extended sources of UVB and UVC had raised PTFE diffusers. We conclude that UV radiometers with a directional response error f2 < 10% are readily available commercially, and that it would be appropriate for future ultraviolet standards to set an upper limit of 5% on f2. This would ensure that the overall uncertainty in irradiance measurements of extended ultraviolet sources is not dominated by the error in the directional response of the radiometer.
S D Pye; C J Martin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Physics in medicine and biology     Volume:  45     ISSN:  0031-9155     ISO Abbreviation:  Phys Med Biol     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2001-01-19     Completed Date:  2001-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401220     Medline TA:  Phys Med Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2701-12     Citation Subset:  IM    
Department of Medical Physics and Medical Engineering, Western General Hospital, Edinburgh, UK.
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MeSH Terms
Equipment Design
Radiometry / instrumentation,  methods*
Ultraviolet Rays*
Reg. No./Substance:
7782-39-0/Deuterium; 9002-84-0/Polytetrafluoroethylene

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