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?
What are the three main principles of radiation protection
Time, distance and shielding
Detect, analyse and report
Identify, shield and protect
Which one of these can be used to detect radiation?
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?
gamma-rays and neutrons
alphas and gamma rays
alphas and betas
Select 3 natural sources of background radiation:
Rocks and soils
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?
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.
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