Nano-uranium RDD consists of a conventional explosive impregnated with radioactive material. When detonated, the bomb throws radioactive material into the air as dust. The degree of contamination depends on many factors, such as wind speed and direction

Note: Uranium, which is a heavy, toxic, metallic, radioactive element  and shiny with a silvery-white color, belongs to the group of actinides, and its isotope 235 is for The fuel of nuclear reactors  is used. Uranium is a silvery-white metal with weak radioactive properties when refined. a>  is softer. This metal is a thorn hammer, conducts electricity and is slightly paramagnetic.

The density of uranium is 65% higher than the density of lead. If the uranium is separated well, it is strongly affected by cold water and oxidizes against the air. Uranium extracted from mines can be chemically transformed into uranium dioxide and other species that can be used in industry. The use of particles from the micro scale to the nano scale has advantages for various fields. provides science, but since a large percentage of their atoms are on the surface, nanomaterials can react a lot and bring potential risks to humans.Nano Particles are of great interest in both industry and natural sciences due to their wide application. While natural materials have constant physical properties regardless of size, the size of a nano particle determines its physical and chemical properties. Therefore, the properties of a material change as its size approaches the nanoscale and the percentage of atoms on the surface of the material becomes significant.The important feature of all nano The structures are those in which the number of surface atoms is more than the number of volume atoms. This ratio increases with decreasing nanoparticle size. Therefore, the size of the nanoparticle is considered its most important feature.The range of activity of nanoparticles depends on the nature and shape of the nanostructure. With However, if the energy of the nanoparticle field is comparable to the energy of electromagnetic radiation and if within a certain range of wavelength with the occurrence of chemical reactions in materials Under irradiation, significant changes will be made, the activity of nanoparticles up to 100 nm will be significant.

The surface atoms of nanoparticles are not compensated in terms of energy. In general, the results of nanoparticle energy growth can be expressed as the total energy of atoms on the surface of the particle. The freedom of movement of atoms on the surface of nanostructures is limited and only vibrational movements and the movement of electrons are possible. These two electrokinetic reactions are dependent on each other because the displacement of electron clouds of atoms definitely changes the vibrational frequencies of the bonds of nanoparticle atoms. On the other hand, changing the location of valence electrons in the bonds changes the polarity of the bond and the objects known as supermolecule . In this case, electron transfer to a higher energy level becomes possible.

Nano-uranium RDD consists of a conventional explosive impregnated with radioactive material. When detonated, the bomb throws radioactive material into the air as dust. The degree of contamination depends on many factors, such as wind speed and direction.

The nature of radioactivity is such that not all elements are suitable for use in RDD. The half-life of radioactive elements (the time it takes for half of the atoms in a given mass of a radioactive isotope to decay into a stable element) varies up to 700 million years in the case of uranium-235, which is not considered a highly radioactive element. Other isotopes have half-lives of a few hours, making them very dangerous for a short period of time - too short for terrorists to build a bomb and detonate it. The danger of radioactivity from such an isotope can end in a short time. Cobalt-60, on the other hand, has a half-life of 5.3 years, making it an ideal element for use in RDDs.

While obtaining sufficient quantities of a suitable element is not straightforward, radioactive isotopes are widely used, albeit in small quantities (for example, household smoke detectors use very small amounts of radioactive material).

Two isotopes whose availability is of particular concern are cesium-137, which is used in radiation therapy devices for cancer treatment and oil well monitoring, and cobalt-60, which is also used in cancer treatment and industrial radiography. These isotopes are used in devices that typically operate under little security and are sometimes abandoned (or "orphaned"). These isotopes can be moved relatively easily, as they are most harmful only if inhaled. There are numerous sources of such elements in legitimate trade, or they may be stolen during transport. Such isotopes, if collected in sufficient quantities, are considered "ideal" elements for use in RDD.