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# Investigating the Range of Beta Particles In Air.

Extracts from this document...

Introduction

INVESTIGATING THE RANGE OF BETA PARTICLES IN AIR

Prediction

The received count rate decreases as the distance between the source and the detector increases. I predict that count rate is

Middle

50

47

41

44

60

25

29

27

70

18

23

20.5

Analysis

From my graph, you can see that as the distance increases, first at a distance of 5cm the count is a large rate of 3393.5/10s. This falls to a decrease of 706.5/10s at a distance of 10cm. The count rate continues to fall rapidly, and at a count of 500/10s the distance increases by 15cm. This decrease continues, and at a count of 293.5/10s, the increase in distance is 20cm. When the distance is 50cm, the decrease becomes slightly less rapid and the count is 44/10s. The decrease in the count rate further evens out, and at a distance of 70cm, the count is 20.5/10s. Therefore, the curve evens out substantially.

The reason for these changes in the count rate is

Conclusion

The count for each distance was read twice, and this wasn’t quite consistent.

Possible improvements

• A more accurate and readable ruler should be used to measure the distance.
• A proper and fair scale should be used for distance, so that the experiment could be a fair one. The distances should either go up in only 5’s or go up in only 10’s.
• The experiment shouldn’t be done in background radiation, so the readings will be fair; consisting of only beta particles and not gamma also.
• The count for each distance should be read/noted at least three times, in order to produce a more accurate average.

Possible extensions

• Investigating higher and lower distances to see if the trend continues or if there are other limiting factors.
• Further research into Radioactivity to explain my results in more depth.

This student written piece of work is one of many that can be found in our GCSE Radioactivity section.

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