Objective: I will investigate how field strength varies the deflection of Beta particles. Preliminary Work I started my preliminary work because when I started my measurements I used 2 coils used in the experiments to deflect electrons from and gun. When testing for beta particle deflection, I found that the beta radiation was scattered in a very large cone, I can't get any readings with the amount of beta radiation scattering. So I should build some kind of shielding for this investigation, this is so I can measure the deflection more easily. The angle at which beta particles are scattered is 48°. When deciding on the type of shielding, I will try to find the best shielding. The best properties of the shield will be; can be malleable to form different shapes and can be drilled, can stop radiation with small thickness.EquipmentStrontium 90 beta sourceGM tube + meterDifferent thickness of different metalsClamps, protrusions and clamp holder to hold the source and the material to be tested.Method1 . Install the equipment as in the diagram2. Record the thickness and material used.3. Record 5 radiation count readings and record them in a table4. Replace the material to be tested with different material or with material of different size.5. Repeat steps 2 through 4 as needed. Results The background radiation reading is 2, 4, 6, 4, 5, 2. The average count is 3.8 (1 dp). Conclusion This shows that aluminum stops radiation at 3.5mm, this would be difficult to use because this thickness of aluminum is not malleable and aluminum is not soft enough to be drilled. Lead can stop radiation at very thin thicknesses, it is also very malleable and is soft enough to be drilled. I will use a lead shield with a thickness of 0.6mm, as it is the most generous thickness available and is the easiest to shape into any shape I want. I decide how the shielding can be used. I want to have a narrow beam of beta particles in this investigation, so I will use my knowledge on what would be the best way to shield the source. An unshielded source The source is unshielded and has beta particles that scatter. Theta angle is the angle through which beta particles are scattered. The path of the beta particles is not a straight line, but a curve because the beta particles are deflected by moles in the air. The AB points are the farthest points where the beta ration is detected.