Ionising Radiation and Living Things

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Slide 1

The Effects of Radiation

on Living Things

Standard Grade Physics

Health Physics

Slide 2

From this lesson and for the exam, you should be able to:

State that radiation can kill living cells or change the nature of living cells.

State that radiation energy may be absorbed in the medium through which it passes.

State that the dose equivalent is measured in sieverts.

State that for living materials, the biological effect of radiation depends on the absorbing tissue and the nature of the radiation. Understand that the dose equivalent measured in sieverts takes account of the type and energy of radiation.

Slide 3

Radiation

What types of radiation are harmful?

Why is ionising radiation harmful?

Slide 4

Radiation may be absorbed by the medium it passes through.

All living things contain living cells. We have many different types of cells which perform different functions including:

Skin cells.

Red blood cells (they transport oxygen around the body)

White blood cells (they fight infection).

Nerve cells.

Muscle cells.

Brain cells.

Radiation can kill living cells or change the nature of living cells.

Slide 5

The Effects of Ionising Radiation

Ionising radiation can kill or change the nature of living cells.

The effects of the damage inflicted by the ionising radiation may:

be severe and cause immediate effects, or

not become apparent for a long time.

The biological effect of radiation depends on:

The type of radiation.

The type of body tissue or body organ that absorbs the radiation.

The total amount of energy absorbed.

Slide 6

Short-Term Effects of Radiation

Short-term effects usually occur when there’s a large amount of exposure to radiation.

Slide 7

Slide 8

Slide 9

WW2 – Hiroshima and Nagasaki

During the Second World War, two atomic bombs were dropped on Hiroshima and Nagasaki in Japan.

Those people who survived the blast were exposed to a large dose of radiation. Such doses caused severe damage to cells all over the body, especially in the skin, blood, bone tissue and gut.