List all possible routes of entry into a building by radon

Soil, Building materials, Outdoor air, Drinking water, Domestic gas

Explanation:

Radon is a radioactive gas of natural origin, coming from the decay of radio-226 found in a small  proportion in the air that is breathed and is responsible for a fraction of the natural radiation that human beings receive.

Natural radiation is part of the environment and its main components are cosmic radiation, those coming from  the radionuclides, present in soils and rocks, and those of radioactive substances, found in food, water and  air

Ground

In isolated constructions or on the ground floors of buildings without basement, the most important source of radon is the radius present in the  ground. The concentration of radius in the soil is generally between 10 and 50 Bq / kg, although it can reach very high values superior. The average value is around 40 Bq / kg. Radon concentrations in soils vary between 10,000 and 50,000 Bq / m3

Construction materials

Construction materials are, in general, the second most important source of radon indoors. Radon emission from  the construction materials depends not only on the concentration of radius in them but also on factors such as the  fraction of radon produced that is released from the material, the porosity of the material and the surface preparation and finish of the  walls. It is common to find among the building materials products with a radium and thorium content of up to 50 Bq / kg.

Outside air

Because of its low radon content, outside air normally acts as a dilution factor. However, in some cases, in  buildings constructed with materials with a very low radio content outside air can act as a source of radon.

Water for consumption

The use for domestic use of groundwater with a high concentration of radon can mean, when released, a  increase of its concentration in air, especially in bathrooms where the hot water is in motion and the process of  release is favored.

Household gas

In some areas the natural gas used for cooking and heating contains high concentrations of radon that are released into the  burn it down. Generally this is not a significant source and is also very variable depending on the changes in the supply of  fuel.

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?