Wednesday, July 16, 2014

The UV index and cancer incidence

Originally developed by Canadian scientists, the UV index is now a standard measurement of UV radiation that reaches the earth's surface. It is an open-ended linear scale, meaning that there is no upper limit and that, for example, a 4 on the UV index is twice as much radiation compared to when the UV index is 2. The purpose of the UV index is to enable informed choices about sun protection/avoidance as per the recommendations in the chart. In fact the UV index is weighted more heavily for wavelengths in the UV spectrum that cause more skin damage. It is therefore not a pure measurement of the quantity of radiation but a direct measure of the skin damaging potential of the UV radiation. The UV index is typically forecast for solar noon, the time in the day where the UV radiation is at its peak potential. Impressively, the UV index forecast is based on computer models that account for the effects of sun elevation and distance, stratospheric ozone, cloud conditions, air pollutants, surface albedo, and ground altitude.

Slip on a shirt, slop on sunscreen, slap on a hat and wrap on shades.

Getting lots of UV radiation causes skin damage and ages skin. A higher mean UV index has also been associated with increased incidence of melanoma in non-Hispanic whites. A prospective study of UV exposure and cancer incidence also confirms a higher incidence of melanoma in those receiving higher UV exposure. This same study however found a decreased risk of non-Hodgkin's Lymphoma and colon cancer with increasing UV exposure. The study also found significant protection from thyroid, pancreatic and squamous cell lung cancer at intermediate UV exposure levels. Over nine years this study found that UV exposure was inversely correlated to total cancer incidence. The authors hypothesize that the protective effect is due to vitamin D production that occurs in human skin under exposure to sunlight. Is it surprising that the benefits of sun exposure aren't nearly as well known as the risks? I clearly have not done a thorough literature search however there doesn't seem to be much information on UV exposure and total cancer risk. The benefits of UV exposure are possibly less established and have an unconfirmed mechanism which may contribute to the lack of publicity. Also various authorities on skin cancer encourage acquisition of vitamin D through dietary sources.


21 comments:

neha ojha said...
This comment has been removed by the author.
neha ojha said...

Call me at 9193911330, We have Bangalore base agency with affordable price and with all security. There is different type of escort girls such as Bangalore Independent Girls; VIP Bangalore escorts services, and High Profile Girls in Bangalore.
<a href="http:// www.vipbangalorescortsservices.com/bangalore-escorts-service-about.html”>Best Escort Service in Bangalore Call me at 9193911330</a>

Santu Steyn said...

Sweepstakes of pulseoximeter

Try your Luck now.

Get a Chance to win Santamedical SM-165 Pulse oximeter

Eillen Sharma said...

Thanks for your amazing post Visit our website in case you want to make your trip romantic
Call Girls in Gurgaon
Call Girls in Kolkata
Call Girls in Kolkata
Call Girls in Pune
Call Girls in Pune

Eillen Sharma said...

I really liked your post you can also visit mine for
Call Girls in Pune
Call Girls in Ranchi
Call Girls in Ranchi
Call Girls in Ranchi
Call Girls in Mumbai

Eillen Sharma said...


You are just amazing when you write erotic blogs. If youw ant to check mine plz visit
Call Girls in Mumbai
Call Girls in Faridabad
Call girls in Chandigarh
Call girls in Chandigarh
Call girls in Chandigarh

Eillen Sharma said...

I request you to write some vlogs for my website and I can also provide you backlinks to your website plz visit
Call girls in Guwahati
Call girls in Bangalore
Call girls in Bangalore
Call Girls in Jammu
Call Girls in Noida

Eillen Sharma said...

Make your evening special with our
Call girls in Jaipur
Call Girls in Surat
Call girls in Gurgaon
Call Girls in Guwahati
Call Girls in Guwahati

Eillen Sharma said...

I just loved the way you right if you want you can also read mine
Call Girls in Lucknow
Call Girls in Jaipur
Call Girls in Jaipur
Call Girls in Jaipur
Call Girls in Jaipur
Call girls in Narnaul

Eillen Sharma said...

I really liked your post..keep posting
Escorts in Kolkata
Escorts in Kolkata
Escorts in Pune
Escorts in Ranchi
Escorts in Ranchi

Eillen Sharma said...


Keep it up...Very nice article!!
Escorts in Mumbai
Escorts in Mumbai
Escorts in Faridabad
Escorts in Chandigarh
Escorts in Chandigarh
Escorts in Chandigarh

Eillen Sharma said...


Thanks for yor post..Very nicely written
Escorts in Guwahati
Escorts in Bangalore
Escorts in Noida
Escorts in Surat
Escorts in Jaipur
Escorts in Jaipur
Escorts in Narnaul

Eillen Sharma said...

Thanks for your post..I liked it very much.. Keep posting!!
Escort services in Kolkata
Escort services in Kolkata
Escort services in Pune
Escort services in Ranchi
Escort services in Ranchi

Eillen Sharma said...

Keep it up...Very nice article!!
Escort services in Mumbai
Escort services in Mumbai
Escort services in Faridabad
Escort services in Chandigarh
Escort services in Chandigarh
Escort services in Chandigarh

Eillen Sharma said...

Thanks for yor post..Very well written I enjoyed it a lot!!
Escort services in Guwahati
Escort services in Bangalore
Escort services in Noida
Escort services in Surat
Escort services in Jaipur
Escort services in Jaipur
Escort services in Narnaul

Eillen Sharma said...

Thanks for your post..I liked it very much.. Keep posting!!
Escort service in Kolkata
Escort service in Kolkata
Escort service in Pune
Escort service in Ranchi
Escort service in Ranchi

Eillen Sharma said...


Keep it up...Very nice article!!
Escort service in Mumbai
Escort service in Mumbai
Escort service in Faridabad
Escort service in Chandigarh
Escort service in Chandigarh
Escort service in Chandigarh

Eillen Sharma said...

Thanks for yor post..Very well written I enjoyed it a lot!!
Escort service in Guwahati
Escort service in Bangalore
Escort service in Noida
Escort service in Surat
Escort service in Jaipur
Escort service in Jaipur
Escort service in Narnaul

Priya Priya said...

Escorts Service in Mumbai welcomes you all. Myself Priya Sharma, 23 years old Female Escorts working for
Escorts service in Mumbai. I have much experienced and I know each and everything that how to satisfy. Mumbai Escorts


Female Escorts in Mumbai


Mumbai Escorts Services


Escorts in Mumbai


Mumbai Independent escorts

Anonymous said...

When I was in Bangalore I booked Bangalore Escorts. She has perfect body figure and I was totally
satisfied with the services from Female Escorts Service in Bangalore. She has perfect body figure and
gave the excellent service to me and satisfied me with the best services.

Soniya Sharma said...

Escort Service in Gurgaon
Gurgaon Escorts
Female Escorts in Delhi
Delhi Escorts