Radiation Shielding
Test your knowledge of radiation shielding!
What school or college do you attend? *
Which of these types of radiation can be stopped by a piece of paper? *
1 point
What are the three main principles of radiation protection *
1 point
Which one of these can be used to detect radiation? *
1 point
An unknown radioactive source decays by emitting two different types of radiation. A simple experiment is performed to identify if they are alpha, beta, gamma or neutrons. Firstly, a radiation detector is placed 2 cm from the radioactive source and left to measure for 1 minute. Approximately 1000 counts are recorded. A piece of paper is then placed between the detector and source and another 1 minute measurement takes place. Approximately 400 counts are recorded. The piece of paper is replaced by 5 mm thick Aluminium and another 1 minute measurement takes place. Approximately 380 counts are recorded. The Aluminium is replaced by 1.5 cm of lead, and then only 10 counts are recorded in the following 1 minute measurement. Which can you deduce are the two most likely decay types for the source? *
2 points
Select 3 natural sources of background radiation: *
3 points
A radioactive source is inside a nuclear waste drum, it emits beta particles and gamma-rays. The waste is mostly mixed of type including mostly paper and fabric. The drum is made of 1 mm thick steel. Which radiation type can be detected outside the drum? *
1 point
The gamma-rays emitted from a sample of ⁹⁹ᵐTc are collimated into a beam. Calculate the thickness of lead shielding required to reduce the intensity (number of gammas) of the beam by 99% given that the attenuation coefficient is 2.71 per cm. You will need to use the attenuation equation in the experiment guide. *
1 point
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