## Physics 107 - Radiation Shielding |

- Practice at reflecting on your experimental results.
- Practice at scaling graph
axes to uncover functions (models) that fit your data

- Once you have a source in place, check that the distance is set to 0.8 cm (keep this the same through all measurements).
- Measure the radiation counts in 2 minutes.
- Next measure the radiation counts with 3 sheets of aluminum placed over the source (the thickness labelled 'C')
- Is the thickness of three of these sheets of aluminum
sufficient to make your measured count-rate consistent with the
background count-rate? (you will need to divide by the number of
minutes to get a rate in counts/minute) LEARNING CATALYTICS QUESTIONS 8-10.

**Marking Scheme**

2 marks for first attenuation measurements and comparison to background

3 marks for description of your data-taking strategy, adapted as you work to improve it

4 marks for high-quality data on a linearized plot

2 marks for fit a fit on the linearized plot, and a plot of residuals

3 marks for conclusion, including model with parameters and comments on background