Radiation and LifeP2

Revision mind map

http://www.al-noorgroup.com/agro/images/precaution.gif

photons

Electromagneticspectrum

Low frequency

high frequency

radio

microwave

infrared

visible

ultraviolet

X-ray

gamma

Ionisingradiation Damages cells

Time exposure

Intensity (strength)

Precautionaryprincipal

ALARAprincipal

CFC’s

ozone

Greenhouse effectCarbon cycle

CO2

decompose

photosynthesis

Trapped radiation

respiration respiration

Hydrocarbonsfossil fuels

Carbon dioxide

Water vapour

methane

reflected radiation

Benefit / Risk

Protects us from harmful UV

Radiation from the sun

Electromagnetic spectrum

RadioMicrowaveInfraredVisibleUltravioletX-raygamma

Low frequency / energy

high frequency / energy

IonisingradiationHigh doses kill cells. Smaller doses damage cells. Damaging the DNA can result in cancers.

To balance benefit / risk consider: exposure time, intensity and a shield that will absorb radiation i.e. lead, sunblock, etc.

Precautionary principal (better safe than sorry!)

ALARA principalAs Low As Reasonably Acceptable

Ozone (O3) absorbs UV

CFC’s found in fridges and aerosols deplete the ozone layer . Ozone protects all living things from harmful UV.

Global warming: Too much gases in the atmosphere absorb and trap (green house effect) the radiation.

Major greenhouse gases include:Carbon dioxide, methane and water

The carbon cycle is a balanced system.•Photosynthesis (removes)•Respiration (releases)•Burning fossil fuels (releases)•Death / excretion (releases)

Imbalance of the cycle can cause climate change: burning / deforestation

Photons

Explain what is happening in each of the pictures below

A B

Explain the pictures below

A B

Ionisingradiation

Carbon Cycle

Explain

Ionisingradiation

Mobile phones: what is the risk?