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Radiation bracelets

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					Name:___________________           Date:___________        Per:_________
                                                                                         Due date:_______
                                          Radiation Bracelets Lab
Ultraviolet Spectra Information
Your skin is an excellent detector of ultraviolet (UV) radiation. When you expose bare skin to sunlight, your
skin will either turn brown (a suntan) or red (a sunburn). These responses by your skin are a signal that the
cells under your skin are being assaulted by UV radiation. UV radiation wavelengths are short enough to
break chemical bonds in your skin tissue and with over prolonged exposure, your skin may wrinkle or skin
cancer may appear.

There is a safer way to detect UV…by using the UV Beads. These plastic beads contain a harmless chemical,
which changes color when exposed to UV radiation. The colors that develop depend on the wavelength of
the UV radiation.

PART 1:
Each student should take a pipe cleaner and 5 beads that you can string your own UV Detection bracelet.
1. Make a colored dot on one side of the pipe cleaner of your bracelet. Bead closest to the dot will be bead #
    1 and bead farthest from the colored dot will be bead # 5.
2. Examine your bracelet and record the color of all 5 beads in the data table on the page 2.
3. Take your bracelet and hold it up to the sunlight in front of the window for 2 minutes. Record your
    observations.
4. Take your bracelet and hold it up to the sun light in the greenhouse for 2 minutes. Record your
    observations.
5. Bring your bracelet into the stairwell 6 (next to snake room) and record your observations after 2
    minutes.
6. Bring your bracelet outside and expose it to direct sunlight for 2 minutes and record your observations
    (do it at home).
7. Submerge your bracelet in a container beaker of water at least 2 inches deep for 2 minutes and record
    your observations.
8. Wrap your bracelet in a double layer of paper towels for 2 minutes and then carefully peak at it and
    record your results.
9. Put the bracelet in your pocket for 2 minutes and then record your observations.
10. Re-expose your bracelet to the sunlight for 2 minutes and record your observations from the initial
    moment you expose your bracelet to the light. (do it at home)

PART II:
Choose one of the following to design an experiment: (test your procedure at home)

   Design an experiment to determine the effectiveness of 2 types of sunscreen materials and then test
    your procedure. Share your findings with the class tomorrow.

   Design an experiment to determine the effectiveness of 2 types of sunglasses materials that supposed to
    block out the suns rays and then test your procedure. Share your findings with the class tomorrow.

   Design an experiment to determine the effectiveness of 2 types of clothing materials to determine which
    is better at protecting your skin from the suns rays or not (tan through clothes, do they work?) and then
    test your procedure. Share your findings with the class tomorrow.

Lab Report:
   The final procedure for the Part II of the experiment.
   A table containing all the data from both parts of the experiment.
   The conclusions you reached from the second part of the experiment based on your data. In other words, what did
    you learn and how do you know you learned it?
Name:___________________   Date:___________   Per:_________




                                                 Color of Beads
          Test
                             Bead 1       Bead 2       Bead 3     Bead 4   Bead 5


  When bracelet was
   assigned to you


  Classroom window


     Green house


  Stairwell 6 (next to
     snake room)


    Direct sunlight


    Beaker of water


  Double layer paper
        towel


     Jacket pocket


    Direct sunlight

				
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posted:11/21/2011
language:Italian
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