[DOC] [TLE] Fissile material - Wikipedia [PAR] In nuclear engineering, fissile material is material capable of sustaining a nuclear 
fission chain ... Under this definition, the only nuclides that are fissionable are 
those nuclides ... In general, most actinide isotopes with an odd neutron number 
are fissile. ... Uranium-235 which occurs in natural uranium and enriched 
uranium... [DOC] [TLE] Isotopes of uranium - Wikipedia [PAR] Uranium (U) is a naturally occurring radioactive element that has no stable 
isotopes but two ...  fissile m metastable isomer  naturally occurring 
radioactive material ... Uranium-233 is a fissile isotope of uranium that is bred 
from thorium-232 as part ... occurs as an indirect decay product of uranium-238, 
but it makes up only... [DOC] [TLE] uranium-235 | chemical isotope | Britannica.com [PAR] A fertile material, not itself capable of undergoing fission with. ... Of these 
naturally occurring isotopes, only uranium-235 is directly fissionable by neutron 
irradiation. ... used to produce uranium enriched in the readily fissionable isotope 
235U,... [DOC] [TLE] Uranium - Periodic Table of Elements: Los Alamos National ... [PAR] The security of those weapons and their fissile material following the breakup of 
the ... Naturally occurring uranium consists of three major isotopes: 238U (99.28
% ... The heavier transuranic elements are either man-made or they exist only 
as trace ... The +4 state in near-neutral pH solutions readily hydrolyzes to form 
black... [DOC] [TLE] Terms - Ways of Knowing: How We Choose What We Believe [PAR] Namely, any material fissionable by thermal (slow) neutrons. ... It was found that 
an isotope of uranium, uranium-235, easily fissioned with slow neutrons to yield 
... uranium-235 is found in naturally occurring uranium only about 1 part in 137. [DOC] [TLE] DoITPoMS - TLP Library Materials for Nuclear Power Generation ... [PAR] The fuel itself must be easily fissionable, preferably fissile. ... a runaway, 
supercritical, reaction would occur which would be disastrous in the case of a 
nuclear reactor. ... Uranium is the only naturally abundant fissile material and 
exists in an ore, ... It has an isotopic composition of 99.3% of the fissionable but 
not fissile 238U... [DOC] [TLE] Uranium and Depleted Uranium - World Nuclear Association [PAR] It is the only element with a naturally-occurring fissile isotope. ... only naturally-
occurring material which can sustain a fission chain reaction, releasing ... The 
isotope U-235 is important because under certain conditions it can readily be 
split,... [DOC] [TLE] Why is U235 used for chain reaction but not U238 | Physics Forums ... [PAR] Mar 24, 2006 ... U235 is considered 'fissile', which means the nucleus is readily or more easily ... 
and a whole chain reaction only used U235? any other isotopes or elements and 
... which converts more fertile material, i.e. U238 to Pu239 than it consumes. ..... 
The reason uranium is used is that 1) it occurs in Nature, and 2)... [DOC] [TLE] FM 8-9 Part I/Chptr 2 Conventional and Nuclear Weapons - Energy ... [PAR] Thus the isotope identified by the example notation is the naturally occurring, ... 
those isotopes of uranium or plutonium which undergo fission most readily. ... To 
meet this requirement, a mass of fissionable material having specific .... Here the 
electrons may only be moved to a higher energy level in the atom (Figure 2-XII). [DOC] [TLE] Fissile vs Fissionable Material: What's the diff? Fission is the nuclear ... [PAR] Fission is the nuclear reaction that occurs when an atom is split into smaller ... 
Fissile: Isotope only bombarded by thermal, slow-moving neutrons capable of ... 
Recall that natural uranium after it has been milled is primarily U-238 with only 
0.7% ... chain-reaction most easily and produce more energy from absorbing one 
of... [DOC] [TLE] CHEMICAL, PHYSICAL, AND RADIOLOGICAL INFORMATION - NCBI [PAR] Uranium is a naturally occurring element that makes up approximately 24 ... 
ductile, slightly paramagnetic, and very dense, second only to tungsten. ... The 
predominant isotope of uranium found in nature, 238U, is not readily fissionable, 
but a ... among the elements because it is both a chemical and a radioactive

Question: Only material occuring in nature that is readily fissionable is an isotope of this
Answer: uranium