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NTR: Request for P06 MED/hr #20
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@botheredbybees Sorry for the time it took to respond to your request. What are the quantities or parameters associated with this unit of MED per hour? |
Thanks Gwen. This looks good to me. That said, MEDs are a pathetic unit of
measurement, aren't they?. You totally deserve an award for getting this
written up...
[image: GoodJob.jpg]
…On Tue, 8 Jun 2021 at 05:40, Gwen Moncoiffé ***@***.***> wrote:
@botheredbybees <https://github.com/botheredbybees> Sorry for the time it
took to respond to your request. What are the quantities or parameters
associated with this unit of MED per hour?
I see that in the document referenced above, it says: "Ambient UVR may be
measured in purely physical units or weighted using an erythemal response
function to give biologically effective UVR, expressed as joules per square
metre (Jm-2), minimal erythemal dose (MED), standard erythemal dose (SED)
or the solar UV index.".
It also defines MED as "that dose of UVR required to produce a barely
perceptible erythema in people with skin type 1 (200 Jm-2 of biologically
effective UVR)."
So "MED per hour" would be defined as e.g. "Units used to quantify
ultra-violet radiations (UVR) received in an elapsed time of one hour (3600
seconds) where the quantity of UVR is expressed as a function of the dose
required to produce a barely perceptible erythema in people with skin type
1 (200 Jm-2 of biologically effective UVR) ." Would that be correct?
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@roy-lowry @dr-shorthair what are your views on this unit? If I understand correctly 1 "MED" is equivalent to 200 Joule per square metre. J/m2 is the SI unit of radiant exposure or fluence which is defined in Wikipedia as "the radiant energy received by a surface per unit area, or equivalently the irradiance of a surface, integrated over time of irradiation". Here we have MED per hour meaning that the quantity associated with it would be an "exposure rate" so maybe I need to modify slightly my definition to be: |
I never heard of |
Required
Term name (PrefLabel)
MED/hr
Definition
MED (minimal erythema dose) of UV radiation per hour
Optional
Sources/references
Solar Ultraviolet Radiation - World Health Organization - https://www.who.int/uv/health/solaruvradfull_180706.pdf
ORCID
https://orcid.org/0000-0001-6840-6785
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