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防晒霜的防晒指数是什么意思

发布时间:2018-09-20 08:27 作者:admin 来源: 点击: 字号:

woman sunscreen beach

According to the Royal Pharmaceutical Society (RPS) in the UK, most Britons are unaware that the SPF rating label displayed on sunscreens does not offer full spectrum protection against damaging sunburns and cancer causing UV wavelengths。 Moreover, a quarter of the questioned participants had no idea what SPF means。

Companies aren’;t helping either, further fueling confusion by releasing SPF 80 or SPF 100+ products, which trick bewildered consumers into thinking they’;re wearing double or even triple protection when in fact the benefit is marginal at best。 With this in mind, the RPS suggests it’;s now time to introduce a new sun protection rating system, one that covers both types of cancer-causing UV rays (A and B), which is less ambiguous。

Contents

Know your UV ABCs

The three types of UV rays。 Image: Skin Care Club

The three types of UV rays。 Image: Skin Care Club

There are three main types of UV rays: UVA, UVB and UVC。 UVA stands for Aging because it penetrates deep into the skin and is responsible for premature aging of the skin and skin cancer。 Tanning beds can emit two to five times more UVA radiation than the sun。 UVB stands for Burning。 It mainly affects the outer layers of the skin, causing sunburns, premature aging of the skin, and skin cancer。 UVC radiation is the strongest, most dangerous form of UV light。 But you don’;t have to worry about this latter class of ultraviolet rays since they’;re all blocked by the planet’;s atmosphere and never reach your skin。

According to the National Cancer Institute, the rate of new melanoma cases among American adults has tripled since the 1970s, from 7。89 per 100,000 population in 1975 to 22。7 in 2010。 (NCI 2015)。 Of course, some of the increased incidence rates can be accounted to better diagnosis, but over exposure to the sun and indoor tanning also definitely play a major role。 This is why most doctors stress very hard that you should wear sunscreens always when it’;s clear you’;ll be spending your day on the beach。 The most vulnerable hours are those between 11 am and 4 pm。

Sunscreens are designed to protect skin from UVA and UVB radiation, which as stated above can cause cancer。 But the SPF rating –; a label that determines the efficacy of a sunscreen product –; indicates the level of protection against UVB rays, and UVAs which can be just as dangerous if not more。 According to the  RPS survey which questioned 2,000 Britons, only 8% knew that the SPF rating refers to protection from UVB rays only。  Most said either they thought the SPF was an indication of levels of protection from both UVB and UVA (56%), or they did not know what the rating stood for (25%)。 There are of course sunscreens that product against both UVA and UVB。 These are labeled with

本文源自: 环亚娱乐

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