Plutonium 239, it is one of isotope of 3 kinds of main fission (other two kinds are uranous 233 He You 235) , can use at the nucleus to play make and reactor fuel. Its disintegration means is α disintegration, energy is 5.517MeV, to the α particle of this energy, the meeting in expert gets radiation, but cannot penetrate because of its the skin, cannot cause greater harm (unless radiative source enters human body) , accordingly, be taken or need not worry.
Beryllium, divide the lightest metal outside lithium, because its are atomic nuclear quality is small, it is material of very good neutron slowing down so, plus its oxide high temperature resistant, intensity is high, can make the reflector of reactor, manage together, play in the nucleus all round wrap a Beryllium to also can have the effect like reactor reflector. Beryllium also can be used as neutron source, beryllium 9 be produced carbon by the bombard of high-energy α particle 12 give off a neutron, 239 reaction produce the neutron of generation and plutonium fission, generation is fluorescent, I think the film uses beryllium mediumly to detect the true bogus of plutonium is this principle. Additional, because produce the position of fission,play in the nucleus exterior, the neutron that can a large number of new students are become escapes, avoided what the nucleus explodes to happen.
A paper can block α disintegration come down to want not to eat only go down the question is not big, the problem is not here, however this one ball estimates appraise 30 kilograms how to mix in their hand plastic ball is same. Uranium and plutonium are in when exceeding critical volume, it is α disintegration. Should not eat to go in or inject to be caused into blood along with breath only inside radiation, the question in expert is not big. Plutonium is poisonous, but not dangerous in that way like polonium. No matter,be both only elemental symbol (Pu VS Po) or glyph pronunciation is very similar, the likelihood was caused accordingly certain and promiscuous. Spark comes to help in, martha bud is holding batteries of so big plutonium in the arms have nothing to do. The nuclear material need that is used at fission is stabilized as far as possible when be not started, namely the nuclide with natural very weak disintegration. Weapon class is uranous ah plutonium ah radioactivity (take no account of noxiousness) , should not appear only absorb the circumstance inside body, it is to be able to be not had defend of the contact.
Plutonium 239 it is α disintegration, α ray penetrability is very weak, cannot penetrate commonly the skin, a piece of paper can be held off, so plutonium wraps a plastic film to take is doing not have a thing in the hand, the harm sex to the person very little. Long-term of course contact has a problem. Beryllium of other external use will examine plutonium, knowing is what principle, also do not know correct. But I can say clearly, beryllium can absorb neutron, be opposite at the same time X ray is almost complete and transparent. Once the experiment buckles the hemisphere of beryllium and plutonium together, brought about plutonium to achieve exceed critical condition, can produce the fission chain reaction of small degree, give out La Guang, give off a large number of all sorts of ray (but won't explode) . What plutonium radiates is α ray, penetration is weaker, and half-life is long, radiative dose is small, because noxiousness of this external exposure is not very strong (long-term of course contact has a risk) , feel namely feeling having heat. Anyhow should not eat only go down to be not had hinder greatly
Plutonium disintegration of α of 239 main generation, this kind defend very easily, take a glove to go. Actually uranous 235 similar also, can take a hand of hand apply mechanically to be being held in the palm.
Disintegration type is on one hand, because their half-life is very long,be on the other hand, be as long as tens of thousands of years, such active are smaller. Can analogy illuminates for a candle flame is smaller, the time that so ability burns is long, and lesser flame means radioactivity lesser. The nuclear waste material that has burned inside reactor can produce a few half-life very short, have radio isotope of a few years only even, their radiate is very strong.
The nuclear fuel with so pure some, because have packet of case, some people feel with the hand directly even. As to detect with beryllium, I feel not to rely on chart, the effect with the biggest Beryllium is to be able to reflex neutron to serve as reflector, can use even adjust reactivity. But also only this just, did not hear what it can produce with plutonium alone special appearance.
