## Upcoming seminar

News
November 10, 2014

# Where does radon / radiation come from?

Radon can come from different sources in various doses:

• Radon inhouses3,0mSv*
• Medical0.6mSv
• Soil0.5mSv
• Space0.3mSv
• Own body0.2mSv
• Other <0.1 mSv

SI unit sievert (Sv) is the unit of absorbed dose. One sievert is a high dose of radiation, on the verge of serious harm. Commonly are used smaller units millisieverts (mSv) = one thousandth of a sievert, and microsieverts (Sv) = one millionth of a sievert. The natural background radiation dose gives about 0.1 microsieverts an hour.

Radiation dose is a measure of the energy transferred to an irradiated object. A radiation dose can be defined in different ways. The absorbed dose refers to the absorbed energy per unit mass. The unit of absorbed dose is the gray (Gy). Equivalent dose is weighted by reference to various types of radiation differ in biological effect per unit of absorbed dose. The effective dose equivalent is additionally weighted by reference to the various organs of the human body show different sensitivity per unit dose equivalent. Dose Equivalent and effective dose equivalent is measured in sievert (Sv).

Source by Ingemnar Samulsson, SP Sveriges Tekniska Forskningsinstitut