Quiz quiz swap. C/W 1 st October 2011 Recap - Effects of ionising radiation Keywords: gamma rays...

Quiz quiz swap

C/W 1st October 2011

Recap - Effects of ionising radiationKeywords: gamma rays radioactive X-rays radiographer

Objectives:Must – Understand the risk of using x-rays and gamma raysShould – understand the precautions you need to take with x-rays and gamma rays.Could – Understand risk, and perceived risk

Electromagnetic Spectrum

Radio

Micro

Infra-Red

Light

Ultra-V

iolet

X rays

Gam

ma

Wavelength () increases

Can you think of a phrase that would help you remember this order? Gate X Usually Lets In Most Radiation

High frequency

Short wavelength

High energy

Most penetrating

High frequency

Short wavelength

High energy

Most penetrating

Low frequency

Long wavelength

Low energy

Least penetrating

Low frequency

Long wavelength

Low energy

Least penetratingx

There is radiation around us a lot of the time......Is this a problem?

CT scan (computer tomography) (drawing a map of your insides!) This uses x-raysWhat are the problems?What are the benefits?Is it worth it?

C/W 2nd November 2011

Microwaves Keywords: absorb microwave sample bias

Objectives:Must – Understand the heating effects of radiation can damage cellsShould – Know what microwaves can be used for. Could – Understand how risks can be assessed.

Microwaves transfer energy when absorbed by water, They transfer less energy than x-ray or gamma rays.

They still heat though because:1)They are very

intense2)The radiation is

absorbed for a long time.

HHo

We saw last week we can think of light as little packets of energy called photons.......

How microwave works clip

Mobile phones also use microwaves to send information

•These don’t heat your head so much, as they are less intense •There is no clear link yet between mobile phone use and cancer

Why are sun beds going to be banned?

C/W 2nd November 2011

Microwaves Keywords: absorb microwave sample bias

Objectives:Must – Understand the heating effects of radiation can damage cellsShould – Know what microwaves can be used for. Could – Understand how risks can be assessed.