Investigating the Range of Beta Particles In Air.

... 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 INVERSLY PROPORTIONAL to distance. Distance Count 1 (/10s) Count 2 (/10s) Average Count (/10s) 5 3378 3409 3393.5 10 700 713 706.5 15 495 505 500 20 260 327 293.5 30 121 115 118 40 65 84 74.5 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

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