RADIATION LAB TIME - DISTANCE - SHIELDING - PowerPoint PPT Presentation

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RADIATION LAB TIME - DISTANCE - SHIELDING

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RADIATION LAB TIME - DISTANCE - SHIELDING Health Physics Society - Power Reactor Section Radiation Science Education Radiation Measurements #1 - Take a background ... – PowerPoint PPT presentation

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Title: RADIATION LAB TIME - DISTANCE - SHIELDING


1
RADIATION LABTIME - DISTANCE - SHIELDING
  • Health Physics Society -
  • Power Reactor Section
  • Radiation Science Education

2
Radiation Measurements
  • ______ c/m
  • ______ c/m
  • ______ c/m
  • ______ c/m
  • 1 - Take a background measurement. Use the
    lower scale - counts per minute (c/m).
  • 2 - Measure the radiation level on contact with
    the plate or mantle using the open window
    detector.
  • 3 - Place a medium thick piece of material
    (wood) over the object and repeat the
    measurement.
  • 4 - Place a very thick piece of material over
    the object and repeat the measurement.

3
Shielding
4
Shielding
  • ? ? 2
  • ? 3
  • ? 2 - 3
  • background ? 4
  • The first measurement included beta and gamma
    radiation from the plate/ mantle plus background
    radiation (alpha radiation was too weak to pass
    through the detector wall).
  • All the beta radiation was shielded by the medium
    thick material so 3 measured gamma only.
  • Nearly all of the gamma radiation was shielded by
    the very thick piece of material.

5
Shielding
  • If you increase the shielding around a radiation
    source, it will decrease your exposure.
  • If you stand out in the rain without an umbrella,
    you will get wet.
  • But, if you use an umbrella to shield you from
    the rain, you will remain dry and protected.

6
Distance
  • ______ c/m
  • ______ c/m
  • ______ c/m
  • ______ c/m
  • Measure the radiation level at the surface of the
    plate or mantle.
  • Move 2 inches away and repeat the measurement.
  • Move 12 inches away, repeat the measurement.
  • Move 3 feet far away, repeat the measurement.

7
Distance
  • The farther away you are from a radiation source,
    the less exposure you will receive.
  • Compare this to sitting in front of a fireplace.
    You can sit directly in front or across the room.
  • If you are far from the source, your exposure
    would be much lower.

8
Time
  • _________ c/m
  • c/m 4 hours 60 min/hr _____ counts
  • c/m 24 hours 60 min/hr _____ counts
  • Place the lantern mantle in your pocket and take
    a open window measurement.
  • If you leave it there for 4 hours, how many
    counts does your leg see?
  • If you leave it there for 24 hours, how many
    counts does your leg see?

9
Time
  • Decrease the amount of time you spend near the
    source of radiation, and decrease the amount of
    radiation exposure you receive.
  • If you spend a lot of time on the beach,
    ultimately you get a sunburn. But, if you spend
    less time in the sun, you wont.
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