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03-18-2005, 09:25 PM | #2 (permalink) |
Team TanTalk Join Date: Nov 23 2004 Location: ITA Member & Berman Supporter!
Posts: 3,136
Rep Power: 25 | I asked this same question myself on another tanning board. My question, and the answer, is below... "Sunsally wrote: Off topic, but from Don's post, this question has come up twice this week and I have to admit, I had never thought of it and don't know the answer.... I understand the standard is 4MED. But how does that translate into "time outside in the sun"? one day? 4 hours? 4 hours over the noon hour or 4 hours from 1-5 pm. In Florida or Michigan? In August or May? Inquiring minds want to know, and I have no idea!" -------------------------------------------------------------------------------- Don Milestone Poster Member # 20 posted 03-12-2005 01:06 AM -------------------------------------------------------------------------------- Today at Noon in Tucson, AZ the Te (4.0 MED) time was 90 minutes which means that the 0.75 MED time (i.e., the "Initial Session Time" for a sunbed) would be 16.9 minutes and the 1.0 MED time would be 22.5 minutes (i.e., the "sunburning" time). The shortest Te (4.0 MED) time I have recorded here (August 28, 2001) was 36.9 minutes (0.75 MED = 6.9 minutes and 1.0 MED = 9.2 minutes). The so-called "typical" mid-western summer day has a Te (4.0 MED) time of 60 minutes for an 0.75 MED time of 11.3 minutes and a 1.0 MED time 15 minutes. Thus, a 20 minute MET (Maximum Exposure Time) sunbed delivers 4.0 MED three times as fast as sunlight on a typical summer day. Keep in mind that it is dose (i.e., 4.0 MED = 624 J/m^2) and not dose rate (i.e., 20 minutes or 60 minutes) that determines the biological reaction (i.e., sunburning). Therefore, 4.0 MED in 20 minutes in a sunbed is the same as 4.0 MED in 60 minutes in sunlight. Does this help? |
03-29-2005, 10:07 PM | #3 (permalink) |
Join Date: Aug 12 2002 Location: Michigan Age: 60
Posts: 338
Rep Power: 22 | For all those that don't live in Arizona, this asymetrical graph shows precisely what the equivalent maximum session times would be for tanning sessions starting at any time during the day on a typical midwestern sunny July. Keep in mind that there are a few other variables involved, and that this would only be for one side of the body if one was sunbathing laying down. Also keep in mind that this is the burning equivalent only, it says nothing about the UVA tanning strength (or lack thereof). |
03-30-2005, 10:21 PM | #5 (permalink) |
Join Date: Aug 12 2002 Location: Michigan Age: 60
Posts: 338
Rep Power: 22 | True the clients will believe what they're told, mostly. But not true taht you might as well make up an answer. If you assume someone is laying out on a cloudless day (forget that crap about clouds not blocking any sun), then the exposure durations for any given time during the day as shown in the graph are pretty accurate. |
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