Does human body contain radioactive substances ?If so explain.?
361723
YES.\n\nthere are always "isotopes" of common elements in the body such as carbon, nitrogen, oxygen, etc.  present at any given time.\n\nisotopes are chemically identical to their "regular" counterpart elements but differ by one or two neutrons in their atoms.  this makes some isotopes radioactive ( a fact which can be measured as in carbon-14 dating ).  \n\nthe effect of this radiation is exceedingly small and of no concern to life.
163467
Probably most of it comes from radioactive decay.
340502
We don't do body counts. Independent estimates range from 75.000 to 150,000. That doesn't account for the one who will die in the future from their injuries or the estimated half million who will die within 10 years from radiation poisoning.
65491
radioactivity is caused by a instability in the forces holding the nucleus of an atom. A atom emits radiation to allow it to change into a more stable element or isotope.
232142
The radioactive material would have degenerated, eventually degrading to non-radioactive metals. The radioactive material would be unstable, containing extra neutrons and protons, which the atom naturally wants to loose, to become more stable. Look up isotopes to explain theory of radioactive atoms, and such.
232271
Links below have history of the development of radioactivity:\n\nIsotopes in Research and Medicine\n\nScientists can now create radioactive forms of common elements, called isotopes. Each isotope has a fixed rate of decay which can be characterized by its half-life, or the length of time that it takes half of the radioactive atoms in a sample to decay. Because each isotope decays at a unique and predictable rate, different isotopes can be used for a variety of purposes. For example, isotopes play an important role in modern medicine. They can be ingested and traced in their path through the body, revealing biochemical and metabolic processes with precision. These isotropic "tracers" are currently used for practical diagnosis of disease as well as in research.
1040820
those two are proteins and nucleic acids (DNA and RNA).  those two are present in all the living beings (the only problem with them is, that in viruses they are present - but some scientists belive that viruses are not living materia).\n\nthere are other organic components in living materia, such as lipids, carbohzdrates, vitamins, ferments etc.\n\nand those organic moleculas are composed of minerals - those which are listed in the first answer.
970862
Sulfur is not radioactive. It is a nonmetal that takes 2 electrons to form a S-- ion. It does exist on its own in nature . It is found in the body in aminoacids.
192566
not sure. we are primarily organic beings. that's made-up mainly of C and its compounds. CH and that stuff. fresh bones have other components. Ca, lipids that kind of stuff. burned bone is mostly made up C only.
518436
No, it comes from inside the TV. Only a tiny fraction is from cosmic radiation. PS, the number of points i have from the time of answering right now, is 24 less than my year of birth.
851722
Absorption of a small amount does not hurt your body.  Our body can cope with it.
1022884
The adult human body contains approximately 28g of magnesium.\n\nMagnesium is an essential mineral which is found in the muscles, soft tissues and body fluids. It works in conjunction with calcium and helps relax muscles.\n\n \nNecessary for healthy bone growth \nHelps nerve and muscle tissues to function \nHelps metabolise proteins and nucleic acids \nWorks on a cellular level in conjunction with calcium, sodium and potassium
923396
do you mean apart from radiation and dead people?
1136414
breathing, thought, eating, excersize, emotion, sickness, immunity and basically everything a human does would have some kind of chemistry involved considering we are multicellular organisms made up of many elements such as oxygen, calcium, carbon, nitrogen etc
782771
There are several different methods and applications. The most common is using them as contrast agents: the solution containing radioactive isotope (say Iodine) injected into specific side (depends on the area of interest - might be specific organ or vessel) and after that using special radiation detecting equipment they monitor the movement of this agent through specific tissues or blood. Using this technique many health problems can be diagnosed. The radioactive istotpes used here are usually short living and do not cause hurm to the body.
1157452
The first 92 elements of the periodic table occur naturally (from hydrogen to uranium).\n\nBTW, in reference to earlier poster, some of the naturally occurring elements (radon, radium, uranium, others) are radioactive, as well.
924996
There are thousands of toxic items used in industry, agriculture, water treatment, etc that can be used as terrorist weapons. However Po-210 is very toxic.  It is readily soluble in dilute acids and disperses throughout the body.  It is 5000 times as radioactive as radium.  It emits alpha particles, which means that inside a sealed container or capsule it's virtually harmless, but in proximity to bone marrow, hair follicles, lung, liver, and kidney tissue (plus other tissues) it can deliver a high dose of radiation.  It is made in nuclear reactors by bismuth-209 absorbing a neutron to become bismuth-210, which emits a beta particle (same charge and size as an electron) to become polonium-210.  Which leads one to speculate that, if Mr. Litvinenko was indeed intentionally poisoned with this substance, the perps must have had access to a nuclear reactor and/or waste products from one.   \n \n        An interesting medical trivia point:  smoking 2 packs per day gives one on the average 1300 millirems of radiation a year because of adherence of polonium (and other radioactive substances) to tobacco leaves.  This is roughly four times the average annual US radiation dose from natural background, including radon, that all of us receive.  Of course, there are areas of the world, e.g. some spots in Iran, where the dose from radon from hot springs is ten times higher than the dose from smoking!