Question

With the beginning of summer in the northern hemisphere, people venture more outdoors to work, play and enjoy outdoor recreation. This increase in outdoor time increases exposure to the sun's radiation. The text discusses how the ozone layer helps protect biological life from excess exposure. Sunscreen is an added layer of protection. Investigate a common sunscreen, (perhaps your favorite one). And tell us the following,: 1) What is a "good amount" of sunscreen to apply? 2) What SPF level is this product and how often should you reapply? 3) What is the active ingredient or ingredients 4) What range(s) of the UV spectrum does this protect from (Figure 3-30 will be helpful) 5) Do you use Sunscreen, do you feel you don't need to?

Answer 1

1) Apply enough sunscreen to cover all the skin other than the clothing will not cover. Adults may need one ounce to fully cover their body skin.

2) It is good to use sunscreen with an SPF of at least 30 which can block about 97% of sun UVB rays.

Sunscreen should be reapplied for every 2 hours when outdoors.

3) Most of the sunscreen contains chemical filters. The product typically includes a combination of oxybenzone, avobenzone, octisalate, octocrylene, homosalate and octinoxate.

4) The sunscreen will protect against one type of UV radiation called UVB.

Sunscreen lotion are said to block both UVA and UVB rays but currently there is no standard for listing UVA blocking power. Inorganic chemical that deflect sunlight will deflect UVA and UVB radiations. Because the radiation can get through the sunscreen and to the skin the SPF indicate how long it will take to become a person skin red.

5) I use sunscreen of SPF 30.

I do not feel it is don’t need to. Because it will help my skin to give a matte finish and prevent from turning into red. It give my skin a considerable protection from sun light.