sun tan lotion
With the rule of nines, the body's surface area
is divided into 11 areas, each representing roughly
9% of the total. Sun tan lotion can be applied
to each of these areas at a dose of 2 mg/cm2 if
two strips of sun tan lotion are squeezed out
on to both the index and middle fingers from the
palmar crease (palm crease) to the fingertips.
The application of this "two fingers" of sun tan
lotion will provide a dose of the product that
approximates to that used during the laboratory
determination of the sun protection factor. Such
a dosage guide is a means of ensuring that users
are protected according to their expectations.
sun
tan lotion
Body
areas by "rule of nines" for extent of burns:
sun tan lotion
•
1
Head, Neck, & Face
•
2
Left Arm
•
3
Right Arm
•
4
Upper Back
•
5
Lower Back
•
6
Upper Fron Torso
•
7
Lower Front Torso
•
8
Left Upper Leg & Thigh
•
9
Right Upper Leg & Thigh
•
10
Left Lower Leg & Foot
•
11
Right Lower Leg & Foot
sun tan lotion
Users in fact are unlikely
to be willing to cover themselves or their families
with such a copious layer of sun tan lotion and
would prefer to apply half this amount. A less
daunting proposition, and the one that we suggest,
is therefore to apply one finger of sun tan lotion
, with the corollary that the resultant protection
would be only about half that stated on the product.
Users should be encouraged to reapply one finger's
worth within half an hour of the initial application
in order to achieve optimal protection.
