GK
NUCLEAR SCIENCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
0.015
|
|
|
0.71
|
|
|
29.71
|
|
|
99.29
|
Detailed explanation-1: -Uranium-238 (238U or U-238) is the most common isotope of uranium found in nature, with a relative abundance of 99%.
Detailed explanation-2: -In terms of radioactivity, however, natural uranium contains about 2.2 percent uranium-235, 48.6 percent uranium-238, and 49.2 percent uranium-234.
Detailed explanation-3: -Natural uranium contains 0.7% of the U-235 isotope. The remaining 99.3% is mostly the U-238 isotope which does not contribute directly to the fission process (though it does so indirectly by the formation of fissile isotopes of plutonium).
Detailed explanation-4: -Where does it come from? U-235 and U-238 occur naturally in nearly all rock, soil, and water. U-238 is the most abundant form in the environment. U-235 can be concentrated in a process called “enrichment, ‘’ making it suitable for use in nuclear reactors or weapons.
Detailed explanation-5: -Naturally occurring uranium is composed of three major isotopes, uranium-238 (99.2739–99.2752% natural abundance), uranium-235 (0.7198–0.7202%), and uranium-234 (0.0050–0.0059%).