Some substances give out radiation all the time, whatever is done to them. These substances are said to be . Radioactivity occurs as a result of changes in the of atoms (nuclear changes). When an unstable nucleus (disintegrates): it emits ; a atom, with a different number of protons, is formed. There are radioactive substances all around us, including in the ground, in the air, in building materials and in food. Radiation also reaches us from . The radiation from all these sources is called radiation.
There are radioactive substances all around us, including in the ground, in the air, in building materials and in food. Radiation also reaches us from . The radiation from all these sources is called radiation.
There are regional in background radiation, as the map indicates. This is manily due to the release of from some igneous rocks as urainium decays. When conducting experiments we must measure the background radiation and take it away from our results. In order for this to give results with an acceptable degree of accuracy, the background radiation should be no more than 10% of the activity. The Earth's atmosphere and magnetic field protects us from the cosmic rays produced by the Sun.
When conducting experiments we must measure the background radiation and take it away from our results. In order for this to give results with an acceptable degree of accuracy, the background radiation should be no more than 10% of the activity. The Earth's atmosphere and magnetic field protects us from the cosmic rays produced by the Sun.
The Earth's atmosphere and magnetic field protects us from the cosmic rays produced by the Sun.
