The diagram shows a box used for storing radioactive sources. Which material is best for lining the box to prevent the escape of most radioactive emissions?

A lithium nucleus contains 3 protons and 4 neutrons. What is its nuclide notation?

A nuclide of the element iron has the symbol shown. 56/26 Fe What does a neutral atom of this nuclide contain?

What is the nucleon number of a nuclide?

A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading. From this result, which type of radiation is the source emitting?

In 1986 the Chernobyl nuclear power station in Ukraine suffered a meltdown. This caused background radiation in many countries, thousands of kilometres from Chernobyl, to increase. What was transported in the atmosphere to these countries to cause this rise in background radiation?

Uranium-235 isa radioactive isotope. It undergoes a chain of decays and eventually forms the stable isotope lead-207. These two isotopes are represented as shown.

During this chain of decay, how many protons and how many neutrons are lost from a single nucleus of uranium-235 to form a single nucleus of lead-207?

A radioactive material has a half-life of 20 days. A sample of the material contains $$8.0 \times 10^{10}$$ atoms. How many atomic nuclei have decayed after 60 days?

A thin sheet of paper is placed between a radioactive source and a radiation detector. The count rate falls to a very low reading. From this result, which type of radiation is the source emitting?

α-particles, β-particles and γ-rays are emitted by radioactive nuclei when they decay. Which emissions can be deflected by an electric field?

Polonium-210 (210/84 Po) is radioactive. Radioactive sources can emit _______________

State which of these radiations carries a negative charge,

State which of these radiations carries a positive charge.

Which is correct on gamma radiation?

Polonium-210 (210/84 Po) is radioactive. (b) State which of these radiations (iii) is the emitted particle in the decay 210/84 Po → 206/82 Pb + emitted particle.

The sample contains zirconium ⁸⁴₄₀Zr. For one atom of ⁸⁴₄₀Zr, state (i) its nucleon number,

The sample contains zirconium ⁸⁴₄₀Zr. For one atom of ⁸⁴₄₀Zr, state its proton number,

The sample contains zirconium ⁸⁴₄₀Zr. For one atom of ⁸⁴₄₀Zr, state the number of neutrons.

Complete the table below for the three types of radiation. radiation: γ nature: electromagnetic radiation charge: ________ stopped by: ________

Complete the table below for the three types of radiation. radiation: β (Beta)

Which is correct for radiation: β (Beta)

A sample of a radioactive material is placed near a radiation detector. A count-rate of 4800 counts/s is detected from the sample. After 36 hours the count-rate has fallen to 600 counts/s. Calculate how many more hours must pass for the count-rate to become 150 counts/s.

The radiation is said to be ionising. This means:

Which is correct for α (alpha) radiation?

Which is correct for α (alpha) radiation?