Uses Of Radioisotopes Flashcards Preview

Physics Module 4 > Uses Of Radioisotopes > Flashcards

Flashcards in Uses Of Radioisotopes Deck (12):
1

Recall industrial examples of the use of tracers

- to find dispersal of waste
- to find leaks/blockages in underground pipes
- to find the route of underground pipes

2

Where are alpha sources used in?

In some smoke detectors

3

What can radioactivity be used for?

To date rocks

4

Recall that some background radiation comes from waste products and man-made sources e.g. waste from:

- industry
- hospitals

5

Evaluate the relative significance of background radiaiton

Cosmic rays from outer space also contribute significantly to background radiation

6

Describe how tracers are used in industry

- radioactive material is out into pipe
- progress is tracked with detector above ground/outside pipe
- leak/blockage shown by reduction/no radioactivity after the point if blockage

7

Explain why gamma is used as an industrial tracer

Because gamma can penetrate through to the surface

8

Explain how a smoke detector with an alpha source works

- smoke particles hit by alpha radiation
- less ionisation of air particles
- current is reduced causing alarm to sound

9

What can measurements from radioactive carbon be used to find

The date of old materials

10

Explain how measurements if the activity of radioactive carbon can lead to an approximate age for different materials

- the amount of Carbon-14 on the air has not changed for thousands of years
- when an object dies (e.g.wood) gaseous exchange with the air stops
- as the Carbon-14 in the wood decays the activity of the sample decreases
- the ratio of current activity from living matter to the activity of the sample is used to calculate the age within known limits

11

Explain how the radioactive dating of rocks depends on the calculation of the unpranium/lead ratio

Thos is because the ratio tells us how long the rock has existed for

12

Understand why background radiation can vary

It can vary depending on the rocks in the area