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Which statement is true about half-lives a Different atoms of the same element have different half-lives. b Each radioactive isotope has its own half-life. c All radioactive nuclides of an element?
The correct answer is: Half-lives are not affected by temperature.
What is a Radioactive Parent?
Radio active parent elements decay to stable daughter elements i.e. the radio active parent Potassium 40 decays to Argon 40 Each radioactive isotope has it's own half life A half life is the time it takes for the parent radioactive element to decay to a daughter product, Potassium 40 decays to Argon 40 with a half life of 1 1/4 billion years. Therin lies the problem of storing nuclear waste
Which statement is true about half-lives?
A. Different atoms of the same nuclide have different half-lives.B. each radioactive nuclide has its own half-life.C. All radioactive nuclides of an element have the same half-life.D. All radioactive nuclides have the same half-life.
What is the rate in halflife that radioactive decay occurs?
Half-life is the time it takes for one half of a certain type of atom (isotope) to decay. The amount of time varies a lot between different isotopes; in some cases it may be a fraction of a second, in another, it may be billions of years.
What is the estimate for how long it takes nuclear waste to complettly decay?
Each radioactive isotope has its own rate of decay, called the "half-life". This is the time that it takes for one-half of the radioactive elements to decay into something else. For very radioactive elements, the half-life is pretty short, but sometimes the element that id decays into is itself radioactive. It _NEVER_ completely decays, but at some point the nuclear waste is no more radioactive than the background material. Remember that some elements like uranium are naturally found in rock formations, and that elements like radon are naturally occuring in the environment. This becomes a problem in the basements moutainous areas, where radon gas accumulates and can cause lung cancers. In general, nuclear waste needs to be protected and isolated for about 50 years; after that, the residual radioactivity isn't going to be especially hazardous.
How does a sample of radioactive waste decay to a nonhazardous level?
All radioactive material has a characteristic half-life. This is a period during which half the matter from the original mass will have decayed into a daughter element. Either the daughter element is non-radioactive and therefore non-hazardous or it is radioactive and has its own half-life. The total radioactivity thus reduces over time and at some stage is deemed to reach a non-hazardous level.
What is the term for the amount of time it takes 50 of an element to decay?
The term for the amount of time it takes for half of a quantity of an element to decay is called "half-life." This is a key concept in nuclear physics and radioactive decay, indicating the time required for half of the radioactive atoms in a sample to transform into another element or isotope. Each radioactive isotope has its own unique half-life, which can range from fractions of a second to billions of years.
How many years will it take for one half of the original amount of material to decay?
The time it takes for half of the original amount of material to decay is called the half-life. The number of years it takes for half of the material to decay depends on the specific radioactive element involved, as each element has its own unique half-life.
What is meant by the half-life of a radioactive nuclide?
A half-life is the time it takes for half the original quantity of a given radioisotope to decay. If we are given a sample of one kind of radioactive material, the time it takes for half of it to undergo radioactive decay is the half-life of that radioisotope. It's a statistically derived figure, but scientists have arrived at some very accurate figures to denote the half-life of different radioactive isotopes.The half-life of an unstable material is a constant which is characteristic of exponential decay. This follows because at any time in the decay process the number of disintegrations per second is proportional to the number of atoms of the isotope present, and this is generally unaffected by any physical influence on the material.The half life of a radioactive isotope (radioisotope) is the amount of time required before half of the original mass of the isotope has decayed. For example, the radioisotope Uranium-238 i has a half-life of 4.46 billion years, therefore, if you have 100g of uranium-238 today in 4.46 billion years you will only have 50g.Radioactive substances undergoes decaying process by emitting alpha and beta particles from its nuclei of its own atoms. The time required to desintegrate half of the amount of a radioactive substance is its half life.
Can radiation be decomposed?
All radioactive isotopes decay at their own rate, yes. It is expressed as "half life", the length of time it takes for the isotopes radioactivity to drop by 1/2. For some trans-uranic elements, the half life is measured in thousandths of a second. But, for plutonium, it is millions of years. For radium, it is 1600 years. For iodine, it is eight days. Each one is different.
What happens to the decayed portion of a radioactive element after the element reached it's half life?
When a radioactive material undergoes radioactive decay, except spontaneous fission, a daughter product is formed. The daughter may or may not be radioactive. If it is, this daughter product begins its own evolution according to its decay scheme and its own half-life. Any daughter products from that decay event will either be stable or will decay according to how (un)stable the daughter is and what its half-life happens to be. The original radionuclide continues to decay in its own way. You can see a "dynamic" developing here. The fact that a radioactive material has a half-life doesn't speak to what happens to the material or to its daughter products. It is only a measure of the rate of decay of a material. Radioactive materials decay according to what they are, and their daughter products will, if they are not stable, undergo decay as well, each according to its own decay scheme. The half-life only puts a timeline on things. And it (the half-life idea) must be applied to each unstable daughter. A consequence of radioactive decay and inspection of the daughter products allows us to use radioactive decay schemes to date materials. There are a number of radionuclides that are useful in doing this, and the decay schemes are well known. We understand the decay rates of the original material and also its daughters, and by counting all of them, we can "rewind time" to the period when they were isolated and state with good accuracy when the material was sequestered. Different methods of dating materials might be applied, depending on the material and its age.
Can you identify atoms that will undergo radioactive decay in half -life period?
Yes and no. Each radioisotope has a distinct half-life so, if you can measure the half-life, you can probably identify the isotope. The problem is that most isotopes decay to other isotopes that are also radioactive, and they have their own half-life, so you must differentiate which isotope you are looking at when you count its decay events in a detector. If the decay event is a gamma event, it is relatively straightforward to differentiate, but if it is beta, it is difficult, though not impossible, because the output energy is a spectrum, and not a single photopeak.
