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| {| class="wikitable"
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| |+Measurement of UV protection afforded by sunscreens and clothing
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| ! style="background: #4479BA; width: 200px;" | {{fontcolor|#FFF|Measurement system}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|'''SPF (Sun protection factor)'''}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|'''UVA‐PF (UVA‐protection factor''')}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|'''UPF (Ultraviolet protection factor)'''}}
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| |style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |'''Definition'''
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| *[[Minimum|Minimal]] [[erythema]] [[dose]] ([[MED]]) of [[UVB radiation]] [[Causes|causing]] [[erythema]] after [[Applicability Domain|applying]] 2 mg/cm2 of [[sunscreen]] to [[skin]] [[Division (biology)|divided]] by the [[dose]] [[Product (biology)|producing]] 1 [[MED]] on unprotected [[skin]]
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| * The [[Dose (biochemistry)|dose]] of [[UVA radiation|UVA]] [[Causes|causing]] [[observable]] [[pigment]] [[Dark matter|darkening]] ([[Minimum|minimal]] [[pigment]] [[dose]] [MPD]) after applying 2 mg/cm2 of [[sunscreen]] to [[skin]] divided by the [[dose]] [[Product (biology)|producing]] 1 MPD on unprotected [[skin]]
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| * The [[Ability grouping|ability]] of fabrics to [[Prevention (medical)|prevent]] [[UV radiation]] [[Transmission (medicine)|transmission]] via [[absorption]] and/or [[Reflection (physics)|reflection]] and highly [[Dependent variable|dependent]] on fabric type, [[color]], [[porosity]], thickness, [[weight]], and other factors
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| |style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |'''[[Development|Developed]] for'''
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| *[[Sunscreens]]
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| *[[Sunscreens]]
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| * Clothing
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| |style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |'''[[GlobalCures|Global]] [[Acceptor|acceptance]]'''
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| * International
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| *[[United States]] only
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| * International
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| |style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |'''[[Ultraviolet|UV]] [[wavelengths]] [[Protected health information|protected]]'''
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| *[[UVB radiation|UVB]]
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| *[[UVA radiation|UVA]]
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| *[[UVA radiation|UVA]], [[UVB radiation|UVB]]
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| |style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |'''[[Example 1|Examples]]'''
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| *[[SPF]] 2 [[Protecting group|protects]] against 50% of [[UVB radiation|UVB]]
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| *[[SPF]] 8 [[Protecting group|protects]] against 88% of [[UVB radiation|UVB]]
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| *[[SPF]] 15 [[Protecting group|protects]] against 93% of [[UVB radiation|UVB]]
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| *[[SPF]] 30 [[Protecting group|protects]] against 97% of [[UVB radiation|UVB]]
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| *[[SPF]] 50 [[Protecting group|protects]] against 98% of [[UVB radiation|UVB]]
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| *[[UVA radiation|UVA]]‐PF1 [[Protecting group|protects]] against 20–39% of [[UVA radiation|UVA]]
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| *[[UVA radiation|UVA]]‐PF2 [[Protecting group|protects]] against 40–69% of [[UVA radiation|UVA]]
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| *[[UVA radiation|UVA]]‐PF3 [[Protecting group|protects]] against 70–95% of [[UVA radiation|UVA]]
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| *[[UVA radiation|UVA]]‐PF4 [[Protecting group|protects]] against >95% of [[UVA radiation|UVA]]
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| *[[UPF1|UPF]] cotton 5–10
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| *[[UPF1|UPF]] denim 1700
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| |}
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| {{CMG}}; {{AE}} {{S.M.}} | | {{CMG}}; {{AE}} {{S.M.}} |
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