is used in the airlines to detect the explosives in the luggage. An isotope of Americium (Am ) is used in many industries as a smoke detector. . .
. Archeological research Using the technique of radio carbon dating, the age of the Earth, fossils, old paintings and monuments can be determined. In radio carbon dating, the existing amount of radio carbon is determined and this gives an estimate about the age of these things. .
SAFETY MEASURES In day to day life, you do receive some natural radiation from the Sun. The radioactive elements present in the soil and rocks, the house hold appliances like television, microwave ovens, cell phones and the X-rays used in hospitals. These radiations do not produce any severe effects as they are very low in intensity. The second source of radiation exposure is man-made.
These are due to nuclear reactors and during the testing of the nuclear devices in the atmosphere or in the ground. Improper and careless handling of radioactive materials release harmful radiations in our environment. These radiations are very harmful to the human body. A person who is exposed to radiations very closely or for a longer duration, is at a greater health risk and can be affected genetically.
How old is our mother Earth? Any guess?? It is nearly . × years (around Crore lakh years).
Wow!! . . Permitted range The International Commission on Radiological Protection (ICRP) has recommended certain maximum permissible exposure limits to radiation that is believed to be safe without producing any appreciable injury to a person.
Safe limit of overall exposure to radiation is given as milli sievert per year. In terms of roentgen, the safe limit of receiving the radiation is about mR per week. If the exposure is R, it may cause fatal diseases like leukemia (death of red blood corpuscle in the blood) or cancer. When the body is exposed to about R, it leads to death.
*Dosimeter is a device used to detect the levels of exposure to an ionizing radiation. It is frequently used