What Is Radiation?

The Writing was written by: Md. Raisul Islam Milu
Date:07-03-2010
Signature:
What Is Radiation?


Radiation is a great problem in the world. In physics, radiation describes any process in which energy emitted by one body travels through a medium or through space, ultimately to be absorbed by another body. Non-physicists often associate the word with ionizing radiation. Radiation is energy that comes from a source and travels through space and may be able to penetrate various materials. Light, radio, and microwaves are types of radiation that are called no ionizing. The kind of radiation discussed in this document is called ionizing radiation because it can produce charged particles in matter. Ionizing radiation is produced by unstable atoms. Unstable atoms differ from stable atoms because unstable atoms have an excess of energy or mass or both. Radiation can also be produced by high-voltage devices (x-ray). Atoms with unstable nuclei are said to be radioactive. In order to reach stability, these atoms give off, or emit, the excess energy or mass. These emissions are called radiation. The kinds of radiation are electromagnetic (like light) and particulate. Gamma radiation and x rays are examples of electromagnetic radiation. Gamma radiation originates in the nucleus while x rays come from the electronic part of the atom. Beta and alpha radiation are examples of particulate radiation. Interestingly, there is a "background" of natural radiation everywhere in our environment. It comes from space and from naturally occurring radioactive materials contained in the earth and in living things.

2Nd

The Writing was written by: Md. Raisul Islam Milu
Date: 15-03-2010
Signature:
Radiation and Life



Radiation is effective on our daily life. Radiation is energy traveling through space. Sunshine is one of the most familiar forms of radiation. It delivers light, heat and suntans. We control its effect on us with sunglasses, shade, air conditioners, hats, clothes and sunscreen.
There would be no life on earth without lots of sunlight, but we have increasingly recognized that too much of it on our persons is not a good thing. In fact it may be dangerous, so we control our exposure to it.
Sunshine consists of radiation in a range of wavelengths from long-wave infra-red to short-wavelength ultraviolet, which creates the hazard.
Living things have evolved in an environment which has significant levels of ionizing radiation. Furthermore, many of us owe our lives and health to such radiation produced artificially. Medical and dental X-rays discern hidden problems. Radiation is used to diagnose ailments, and some people are treated with radiation to cure disease. We all benefit from a multitude of products and services made possible by the careful use of radiation.
Background radiation is that which is naturally and inevitably present in our environment. Levels of this can vary greatly. People living in granite areas or on mineralized sands receive more terrestrial radiation than others, while people living or working at high altitudes receive more cosmic radiation. A lot of our natural exposure is due to radon, a gas which seeps from the earth's crust and is present in the air we breathe.

3RD

The Writing was written by: Md. Raisul Islam Milu
Date:15-02-2010
Signature: EFFECT OF RADIATION ON HUMANS


Radiation is very harmful on human life. A very small amount of ionizing radiation could trigger cancer in the long term even though it may take decades for the cancer to appear. Ionizing radiation can cause leukemia and thyroid cancer. There is no doubt that radiation can cause cancer. Rapidly dividing cells are more susceptible to radiation damage. Examples of radiosensitive cells are blood forming cells, intestinal lining, hair follicles and fetuses. Hence, these develop cancer first.
If a person is exposed to radiation, especially high dose, there are predictable changes in our body that can be measured. The number of blood cells, the frequency of chromosome aberrations in the blood cells and the amount of radioactive material in urine, are examples of biomarkers that can indicate if one is exposured high dose. If you do not have early biological changes indicated by these measurements the radiation exposure will not pose an immediate threat to you.
The risk for radiation exposure has been very widely studied. The general consensus of opinion for the induction of cancer by ionizing radiation is 10% increase in cancer rate/Sv when the dose is given over a short time with a decrease to 5% when the dose is protracted over an extended time period. Therefore a 10% increase in cancer is related to a dose of 100,000 mrem with 5% if the dose is protracted over a longer period of time.

4TH

The Writing was written by: Md. Raisul Islam Milu
Date: 07-03-2010
Signature:
Overview of Radiation Control


Radiation problem is a great problem in our human life. Ionizing radiation can be instrumental in the improvement of health, welfare and productivity if properly used. If improperly used, it may impair the public’s health, and the industrial and agriculture potentials of the state.
Radioactivity from natural sources is present throughout the world. People are continuously exposed to low-level radiation from radioactive materials in the earth and from cosmic rays from space. Exposure to natural radiation can be affected by geography as well as lifestyle. For example, radiation levels are higher in the mountains, and travel by airplane contributes additional exposure because of increased cosmic radiation at high altitudes. The use of X-rays and radioactive materials in medicine adds to our population exposure.

Radiation can be hazardous to people if they are exposed to it in significant amounts.
If radiation producing equipment and radioactive materials are properly handled and regulated, they do not pose a significant risk to the public or to workers. The Radiation Control Program establishes limits for radiation exposure to workers and the general public as a result of the various uses radiation producing equipment and of licensed radioactive materials. In addition, MDH requires users to take steps to keep exposures well below the limits.
Radiation Control staff review radiation safety programs and inspects all sources of ionizing radiation of our registrants and licensees to ensure the health and safety of all members of the public in Minnesota.

All about Radiation

The Writing was written by: Md. Raisul Islam Milu Date: 07-03-2010
Signature:
Protection from Radiation


Radiation protection is very very essential in the present world. Radiation can be creating any problem any time on our human life. So as soon as possible control it. Radiation is very easily detected. There is a range of simple, sensitive instruments capable of detecting minute amounts of radiation from natural and man-made sources. There are four ways in which people are protected from identified radiation sources: Limiting Time: For people who are exposed to radiation in addition to natural background radiation through their work, the dose is reduced and the risk of illness essentially eliminated by limiting exposure time. Distance: In the same way that heat from a fire is less the further away you are, the intensity of radiation decreases with distance from its source. Shielding: Barriers of lead, concrete or water give good protection from penetrating radiation such as gamma rays. Radioactive materials are therefore often stored or handled under water, or by remote control in rooms constructed of thick concrete or lined with lead. Containment: Radioactive materials are confined and kept out of the environment. Radioactive isotopes for medical use, for example, are dispensed in closed handling facilities, while nuclear reactors operate within closed systems with multiple barriers which keep the radioactive materials contained. Rooms have a reduced air pressure so that any leaks occur into the room and not out from the room.