Nuclear Physics

The equation for the alpha decay of 210Po is:

84210Po --> 82206Pb + 24He

representing the alpha particle as a helium nucleus.

206Pb, the daughter atom, is stable.

The answer is 2.

If after one half-life only half of the element remains, then after another half-life half of what was there only remains. So a half of a half is a quarter (or a fourth). So that's 2 half-lives.

The half life of neptunium-238 is 2,117 days.

Alpha decay is basically a helium atom, so 235-4= 231. And 92-2=90 (Uranium's atomic number minus helium's). The element with atomic number 90 is Thorium. The mass is 231, so you should have Th-231 (Thorium-231).

To find the time it takes for Chromium-48 to decay from 360.00g to 11.25g, we can use the concept of half-life. Since Chromium-48 has a half-life of 21.6 hours, we can calculate the number of half-lives it takes to decay from 360.00g to 11.25g. Then, multiply the number of half-lives by the half-life period to find the total time.

Its stability. The longer the half-life, the more stable is the isotope.

Paul Dirac It was Paul Dirac who suggested that there might be an "antiparticle" to the electron in 1928. His mathematical statement, which came to be called the Dirac equation, was an astonishing breakthrough in the understanding of elementary particles. In 1932, Carl D. Anderson actually discovered the positron and confirmed Dirac's postulation. The suggestion of the existence of the anti-electron and its discovery opened the door to the existence of other antimatter particles. It should be noted that Caltech graduate student Chung-Yao Chao is often cited as the first person to detect the positron (1930), but did not identify the little critter. Links are provided below for more information.

The material used to slow down high-speed neutrons in a reactor is called the moderator. The moderator in a pressurized water reactor is the water, which is the main coolant. Collisions between the neutron and hydrogen nuclei (protons) slow the neutron down (thermalizing it) and increasing the probability that it will be absorbed by another fissionable atom. That makes the chain go, it maintains the chain reaction. Slowing down neutrons does NOTslow down the process of nuclear fission. If anything, it maintains it or speeds it up because slower moving neutrons have a higher probability of being absorbed and continuing or building the chain reaction. A link is provided.

We generally consider nuclear fission as the "splitting" of atoms. In this process, a large atomic nucleus splits into two smaller nuclei. The smaller nuclei are called fission fragments, and they are radioactive. Making nuclear energy, which we do in nuclear reactors, results in the production of large quantities of highly radioactive fission products. These byproducts require that we cool the spent fuel for long periods, and also that we store it for centuries so that the radioactive materials have a chance to decay and become less hazardous.

Alpha particles have two protons and two neutrons. since the atom just lost two protons, it's atomic number decreased two. It also decreased it's mass number by four because it lost two protons and two neutrons.

In beta minus decay (as opposed to beta plus decay), the ejected electron will leave the nucleus and the decay event at fairly high kinetic energy. The actual energy will depend on which atom underwent the beta decay. That means there are a range of energies possible. This electron will scatter (collide) and lose energy, and then, having lost much of its kinetic energy, it will just end up "adrift" as a static charge, and finally it will go to ground.

An unstable nucleus (radioactive isotope) may emit: alpha particles, beta particles, gamma radiations, electrons, positrons, X-rays, and neutrons, depending on which nucleus is doing the emitting.

Because if that were not true, the universe would fall apart...

Of the four primary forces, (strong atomic force, electromagnetic force, weak atomic force, gravity), the strong atomic force and electromagnetic force overshadows the weak atomic force and gravity by many, many orders of magnitude so, for this answer, I will ignore the weak force and gravity.

The strong force is more powerful than the electromagnetic force, in the short range, by about a factor of 100. It holds quarks together in order to form protons and neutrons. In doing this, it overcomes the repulsive force that would tend to push the quarks away from each other.

There are several types of quarks, but there are only two different charges. The up quark (and several others) have a charge of +2/3, while the down quark (and several others) have a charge of -1/3.

Combine two up quarks and one down quark together, and you get a proton with a charge of +1. Combine two down quarks and one up quark together, and you get a neutron with a charge of zero. In both cases, there is left over strong force, called residual strong force, residual binding energy, or just nuclear energy. This nuclear energy goes into holding protons and neutrons together, again, against the weaker electromagnetic force that would tend to repel protons away from each other.

Here, it gets interesting. The nuclear force (residual strong force), while stronger than the electromagnetic force, in the very short distances between, say, two protons, gets weaker as the distance increases. So does the electromagnetic force, but not at the same rate. At a certain point, around an atomic number of 83 (Bismuth), the electromagnetic force starts to overwhelm the nuclear force, and the nucleus starts to become unstable, i.e. radioactive.

Certainly, there are other things below Lead (Atomic Number 82) that makes things unstable as well, example being Carbon-14, but, up above Bismuth, nothing is stable.

Alpha radiation is not necessarily the "weakest" radiation. Alpha radiation is the emmanation of helium nuclei, which is two protons and two neutrons. As such, an alpha particle has a mass of 4 and a charge of +2. As a result, it interacts more readily than any of the other forms of radiation. This means that alpha can be stopped with a few inches or air, or even with a sheet of paper. That does not mean, however, that alpha is the least dangerous - if it is ingested, such as into the lungs, it will be in close proximity to sensitive tissues, making it one of the most dangerous forms of radiation. Its penetrating power is certainly the least, but, "weakest", not by a long shot.

The atomic number of argon (Z) is 18, which means it has 18 protons. The mass number (A) is 40, so subtracting the atomic number from the mass number gives you the number of neutrons. In this case, 40 - 18 = 22 neutrons.

A radioactive marker is a molecule that contains a radioactive atom, such as carbon-14 or iodine-125. When the marker is introduced into a biological system, the radiation emitted by the radioactive atom can be detected using specialized equipment like a Geiger counter or a scintillation counter. By tracking the movement and accumulation of the marker in tissues or cells, researchers can study processes such as metabolism, protein synthesis, or cell migration.

The half life of actinium (for the natural isotope 227Ac) is 21,773 years.

The Chernobyl exclusion zone is expected to remain unsafe for human habitation for thousands of years due to the high levels of radiation contamination in the area. The half-life of the radioactive isotopes released during the 1986 Chernobyl disaster is significant, and it will take a very long time for the environment to recover to a safe level for humans.

The thick steel vessel is to contain the high pressure of the water in the reactor, the concrete is to provide radiation shielding, for the operating crew mainly but also to prevent outside equipment from becoming irradiated

1. You do not talk about thermodynamics

2. You DO NOT TALK about thermodynamics

3. One fire at a time

4. Fires will go on as long as they have to

5. If this is your first night, you have to fire

Darmstadtium was for the first time obtained by Sigurd Hofmann, Victor Ninov, Fritz Peter Hessberger, Peter Armbruster, H. Folger, Gottfried Münzenberg, H.J. Schött, Andrei Gheorghievici Popeko, Alexandr Vladimirovici Eremin, A.N. Andreev, S. Saro, Rudolf Janik, Matti Leino at Gesellschaft für Schwerionenforschung, near Darmstadt (Germany) in 1994.

There are three types of radioactive decay, alpha, beta and gamma. Alpha decay is when an unstable, or radioactive, nucleus gives off an alpha particle, which consists of two protons and two neutrons. Beta decay is when a nucleus gives of a positron or an electron, called a beta particle, and gamma decay is when a nucleus gives off a gamma ray. A gamma ray is a highly energetic photon of light.

Many things give off electromagnetic radiation. Cell phones, the body, x-rays, and supposedly ghosts and spirits. EMF detectors (or electro-magnetic-field detector) are also supposed to pick up electromagnetic radiation given off by anything it's pointed at.