Gamma radiation danger does not extend nearly so far and neutron radiation danger is still more limited.
The neutron source, the neutron reflector, and one piece of fissionable material were in place.
Second, a neutron source--the type of radioactivity that produced neutrons--to accelerate the reaction.
Their single five KT bomb contained at least enough plutonium for two critical masses, if brought together inside a good neutron reflector.
And they did have a good neutron reflector--nuclite.
Their atomic piles needed new neutron sources only once every few years, and they carried thousands of tons of methane, compressed into solid form, for their reaction mass.
A small piece from one of the craters, when combined with half of the neutron source in the bomb, should be enough.
The Solution You decide to try neutron activation analysis.
Swimming pool” reactors are frequently used for neutron activation analysis and typically provide neutronfluxes of over 10¹³ (10 million million) neutrons per square centimeter per second.
When two samples are being analyzed for sodium by activation analysis, they must be compared at the same time after they have been removed from the neutron flux.
Neutron activation analysis of these hairs revealed that he had been poisoned with arsenic.
With neutronactivation analysis, you can obtain the “fingerprints” of the two samples to see if they match.
However, because the samples make a rather bulky package, the scientist is concerned with the uniformity of the neutron flux that each sample will “see”.
This film describes the nature, potentialities, and applications of neutron activation analysis.
These film badges were insensitive to neutron radiation and did not measure the amount of radioactive material that might have been inhaled or ingested (1).
The remaining three men drove as close as 320 meters southwest of ground zero to retrieve neutron detectors.
The last party to "go in" on shot-day consisted of six men retrieving neutron detectors.
On the other hand, if the neutron hits a nucleus not very much more massive than itself, the nucleus rebounds and absorbs some of the energy, so that the neutron bounces away with less energy than it had.
The influence of the nucleus in capturing the neutron was greater the slower the neutron, so that it was almost as though the nucleus were larger and easier to hit for a slow neutron than a fast one.
In short, then, the neutron was, so to speak, invisible, and the search for it seemed a lost cause.
The fact that the neutron was just about as massive as the proton was to be expected if the neutron were a proton-electron combination.
Even with the existence of neutron bombardment, involving low energy and high cross section, Rutherford could, with justice, feel right down to the time of his death that nuclear energy would never be made available for practical use.
Discovery of the Neutron Throughout the 1920s scientists searched for the neutron but without success.
It was also not surprising that the isolatedneutron eventually breaks up, giving up an electron and becoming a proton.
The Nuclear Interaction In one place, and only one, did the proton-neutron theory seem a little weaker than the proton-electron theory.
If the neutron rebounds from a number of comparatively light nuclei, it eventually loses virtually all its energy and finally moves about quite slowly, possessing no more energy than the atoms that surround it.
Chadwick managed to work out the mass of the neutron from his experiments and by 1934 it was quite clear that the neutron was more massive than the proton.
Nevertheless, although in some ways we can explain the neutron by speaking of it as though it were a proton-electron combination, it really is not.
Neutrons could bring about nuclear reactions, even when they themselves possessed very little energy, so output might conceivably be more than input for each neutron that struck.
You might say that a single, impossibly tiny, neutron is the difference between an atom bomb and a slowly cooling pile of inert uranium isotopes.
This balance of neutron generation and absorption is the k-factor of the reactor.
Each extra neutron produces two and your production rate soars geometrically towards bang.
This immediately combines with a proton to form a new neutron and emit a neutrino (a high-energy particle with neither mass nor charge).
When this occurs, the new nucleus has one more neutron and one less proton than its parent; in effect a proton has become a neutron as the nucleus loses a positive charge.
After the neutron irradiation, the same surface is etched again, and the new tracks counted.
But all the buildings look dilapidated; the stucco and paint is falling or peeling everywhere; there are fissures in the walls, crumbling façades, tumbling roofs.
I think, nevertheless, that this water is extravagantly, nonsensically blue!
Up from the warm deep color of the sea-circle the edge of the heaven glows as if bathed in greenish flame.
All day the pure sky, the deepening of sea-color, the lukewarm wind.
The neutron spectrometers are located on the floor surrounding the High Flux Beam Reactor (HFBR); the x-ray spectrometer was placed in the same building in order to facilitate linking it to the computer.
Introduction An EMR 6130 computer system has been installed and is being prepared for use with Columbia University's Neutron Velocity Spectrometer data-acquisition and analysis system.
The Miran answered with the neutron beam, atomic and gamma bombs--and the crumbler ray.
And neutron guns in plenty waited on small ships just outside the atmosphere to explode harmlessly any atomic or gamma bombs Miran ships might attempt to deposit.
They spotted the dome of the station, and a neutron ray lashed out at it.
Tungsten, while it has a beautifully high melting point, is mostly open space, and a neutron just sails right through it, or any heavy atom.
Heat--quantities of heat were being poured into the little ship, and the neutron guns were doing their best to add to it.
The Mirans were dodging these now as they loosed atomic bombs, only to see them exploded harmlessly by neutron guns, or caught in the magnetic screen.
That ship that attacked us, attacked with a neutron gun, a gun that shot neutrons through the hull of our ship as easily as protons pass through open space.
Simultaneously, from the three leaders, terrific neutron rays shot out.
Like theneutron gun which I told Commander McLaurin would be useless as a weapon, they'd be prepared for it, you can be sure.
They gave me just ten millions, and that only because you demonstrated you could shoot every living thing out of the latest IP cruiser with that neutron gun of yours.
An exception is the hydrogen atom, which has no neutron in its nucleus.
But--the day that neutron bomb was accidentally fired and started the rash of Psi mutations in the ring outside the fatal area centering on Logan, your parents were in a jet airliner.
I never told the rest of the Committee that on the 19th of April in '75 that jet was over Iowa, en route to San Francisco, and possibly close enough to Logan for its passengers to have been affected by the neutron spray.
VII The colossi were piling Mitchell Prell's movable equipment into a corner, where Midas Touch pistols, turned low, could play neutron streams against it.
And even if beings invisible in smallness could escape death in neutron streams from Midas Touch pistols turned low, there would be little left that they, in their tininess, could work with.
Lashing their equipment to their shoulders and tying onto one another's waists like Alpine climbers, they leapt back into space one more, pushed by the neutron thrust of their Midas Touch cylinders.
But before we even open a door we'll sterilize everything with a four per cent neutron stream.
The three cylinders were Midas Touch pistols--neutron blast guns that could explode a few of the atoms of any solid or liquid that their beams touched.
It held a cylinder whose neutron beam could level anything.
A patrolling rocket ship sailed high; an intensified neutronbeam turned a finger of air white hot behind it--very close.
Second, a neutron source—some material with the type of radioactivity that produced neutrons—to start the reaction.
Their atomic piles needed new neutron sources only once in a few years.
And they did have a good neutron reflector—nuclite.
Activation Analysis Another booklet in this series, Neutron Activation Analysis, discusses a new process by which microscopic quantities of many different materials may be analyzed accurately.
Neutron irradiation of these samples changes some of their atoms to radioactive isotopes.
Enrico Fermi, an Italian physicist, seized upon the idea of using the newly discovered neutron (an electrically neutral particle) and showed that bombardment with neutrons also could induce radioactivity in a target substance.
A reactor accident conceivably could add a unique hazard since neutron radiation might change the normally stable, nonradioactive atoms in the bodies of nearby workers into radioactive ones.
Since a given neutron dose converts a known proportion of ²³Na atoms to ²⁴Na, it is possible to determine how much neutron exposure a worker has received by obtaining his body count of radioactive sodium.
A substantial and interesting account of neutron physics.
This was a supply of small nuclei that did not absorb neutrons readily, but absorbed some of the energy of collision and slowed down any neutron that struck it.
This was particularly true in the conversion of hydrogen to helium; that is, the conversion of the individual protons of 4 separate hydrogen nuclei into the 2-proton—2-neutron structure of the helium nucleus.
The neutron splits the nucleus into two parts and creates huge amounts of energy in the form of heat.
Since the neutron has no charge, the antineutron has no charge either, and one might wonder how the antineutron would differ from the neutron then.
Even if it can’t be prepared in quantity to begin with, it might be formed by neutron bombardment of lithium, with the neutrons being formed by the fusion reaction.
Another isotope capable of fissioning under neutron bombardment is uranium-233.
In these, it sometimes happened that a fastneutron might strike a nucleus with sufficient energy to cause it to emit 2 neutrons.
It took the impact of a very energetic neutron to bring about the emission of 2 neutrons.
You could imagine that a neutron being absorbed by a uranium nucleus might make the latter so unstable as to cause it to emit 2 alpha particles and become radium.
There was plutonium-239, which would also fission under neutron bombardment.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "neutron" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: electron; meson; neutron; nucleus; particle; proton; strangeness
