Investigate a factor affecting the count rate measured from a radioactive source?

Aspect 2 & 3: Controlling variables & developing a method for data collection:

Equipments:

GM Tube

Alpha, Beta or Gamma radioactive source

Power pack

Diagram:

Method:

. Measure weight of each source

2. Collect results from 1-10 cm to fix the time interval as this gives us 10 data points and increases the reliability of the results.

3. We find count rate using this equation:

4. The values I will use to control will be the temperature and time. Firstly, I will control the temperature by conducted this experiment indoors at 25°C. Also, I will control the time by having a fixed time intervals for each distance of about

5. I will measure the dependent variable Activity by using the GM tube and reading of the values from the power pack but the problem will be that human errors may occur and will

6. I will repeat my readings three times with each distance to help me get accurate and reliable results. This will finally help me get to my average total for each distance.

7. I will control all other variables like the amount of materials used by using only three radioactive elements as this will help make my experiment fair and keeping the temperature constant by using a thermostat as this will keep the room at a constant temperature set at 25°C.