What Is Radiation?

Energy or particles emitted from a source and moving in the air are called radiation. Radio waves, microwaves, X-rays and gamma rays are types of electromagnetic radiation. Visible light is also a kind of electromagnetic radiation. However, this constitutes only a small part of the electromagnetic spectrum.

Sunday, July 19, 2020 - 16:24

Energy or particles emitted from a source and moving in the air are called radiation.

Radio waves, microwaves, X-rays and gamma rays are types of electromagnetic radiation. Visible light is also a kind of electromagnetic radiation. However, this constitutes only a small part of the electromagnetic spectrum.

Electromagnetic radiation occurs when an atom is energized. Energy moves one or more electrons within the atom. As a result of this movement, an electromagnetic wave is produced. Depending on the type of atom and the amount of energy, electromagnetic radiation can occur in heat, light, or in a different form.

All types of radiation in the electromagnetic spectrum are produced by the interaction of two forces called electric field and magnetic field.

An electric field is the force that acts on charged particles (parts of atoms), such as electrons or protons, and causes them to move. The electric current that ensures the operation of all electrical devices is created by the electron flow provided by the electric field. The power of an electric field is expressed in volts per meter (V/m).

It can be taken as a limit value of 10 V/m for exposure to the electric field. In other words, it can be said that long term presence in the electric field above 10 V/m will create a negative situation in terms of human health.

The magnetic field is created by the movement of charged particles. The strength of a magnetic field is expressed by tesla (T) or microtesla (µT), one millionth of a tesla.

In the magnetic field, 0.2 µT can be taken as a limit value. Exposure to magnetic fields above this value, as in the electric field, is harmful.

Power lines, cables, and all powered devices can generate electromagnetic radiation. All electrically powered devices such as refrigerators, washing machines, dishwashers, toasters, water heaters, vacuum cleaners, computers, televisions, mobile phones, radios, cameras, modems, chandeliers and lamps create electromagnetic radiation.

To say whether radiation is harmful; The strength of the electromagnetic field, the distance to the source and the length of the exposure time should be known. Prolonged exposure to high power electrical field can cause serious health problems in children and adults.

Hand held measuring instruments called electromagnetic radiation tester are used for radiation measurement. These devices measure the electric field and magnetic field and make sound and light warning at the values ​​above the pre-defined limits. With the help of the measurement, the devices causing the radiation are determined and the necessary measures are taken.

Emre Yılmaz
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Emre Yılmaz, the founder of Lighting Portal, graduated from Atılım University Department of Electrical and Electronics Engineering in 2013, and since then has been involved in the management and product development activities of state-supported projects in the lighting industry. He completed his master's degree at Gazi University Industrial Design Engineering Department and continues his education in the doctorate program of the same department.

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