the fact is that the concept of a dirty bomb refers to two completely different things, for the first time this concept arose in relation to thermonuclear ammunition, which began to be divided into clean and dirty, as most of you remember from the physics course, for the 10th grade, and those who entered school in 82 and later, then in for 11 years, there are two types of chain reactions, the fission reactions of atomic nuclei and the reactions of their thermonuclear bombs, in which nuclear fission occurs, are called nuclear, or sometimes atomic, they use either enriched uranium as a fissile substance, in which the percentage of the uranium isotope with a mass number of 235 is brought to 85% higher, or, more often, weapons-grade plutonium, that is, a ball consisting mainly of a plutonium isotope with a mass number of 239, ammunition in which atomic nuclei merge is called thermonuclear, and at first they were called hydrogen bombs.
Concept of a dirty bomb | what is dirty bomb