
	Where results make sense

Topic: Fission product

Related Topics

Nuclear waste

Nuclear chain reaction

Nuclear fission

Spontaneous fission

Nuclear weapon

Nuclear physics

Oklo

Nuclear weapon design

United States Naval reactor

Nuclear reaction

List of nuclear accidents

Alpha decay

Chain reaction

Nuclear fusion

Radioactive decay

	Fission product - Wikipedia, the free encyclopedia
		If a graph of the mass or mole yield of fission products against the atomic mass of the fragments is drawn then it has two peaks, one in the area strontium through to palladium and one at iodine through to neodymium.
		Some fission products are useful as beta and gamma sources in medicine and industry, see common beta emitters and commonly used gamma emitting isotopes for more details.
		The mixture of radioactive fission products found in the fallout from a nuclear bomb are very different in nature to those found in spent power reactor fuel.
	en.wikipedia.org /wiki/Fission_product (2230 words)

	Nuclear fission - Wikipedia, the free encyclopedia
		Fission is useful as a power source because some materials, called nuclear fuels, both generate neutrons as part of the fission process and also undergo triggered fission when impacted by a free neutron.
		Fission products have, on average, about the same ratio of neutrons and protons as their parent nucleus, and are therefore usually unstable because they have proportionally too many neutrons compared to stable isotopes of similar mass.
		Fission products tend to be beta emitters, emitting fast-moving electrons to conserve electric charge as excess neutrons convert to protons inside the nucleus of the fission product atoms.
	en.wikipedia.org /wiki/Nuclear_fission (2999 words)

	[No title]
		The fission products can be employed either against personnel, both civilian and military, or they may be used to impair if not destroy the use of agricultural areas for the purpose of producing food crops.
		The quantity of given fission product mixture that is required to produce damaging effects whether it be in humans or plans, depends upon the age and composition of the fission product mixture employed.
		However, absorption of fission products from the digestive tract is not significantly reduced by the use of cathartics.
	www.gwu.edu /~nsarchiv/radiation/dir/mstreet/commeet/meet4/brief4.gfr/tab_o/br4o5a.txt (3096 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Fission products may alternatively or additionally be extracted from the ionic liquid by the addition of an organic solvent.
		In a preferred embodiment of the invention the fission product residue is calcined to convert it into a stable waste form.
		In an alternative embodiment fission product residue is reacted with boric acid to convert it into a suitable form for disposal.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/15175.010301&ELEMENT_SET=DECL (1440 words)

	Glossary (Site not responding. Last check: 2007-10-13)
		Fission- A nuclear reaction in which a nucleus is split into fragments, usually two pieces of comparable mass, accompanied by a release of energy.
		Fission Fragment- A direct product of fission, a fission fragment, also known as fission daughter, is usually radioactive.
		Reactor- A device which produces controlled amounts of heat and radiation by nuclear fission, although research is being done to use nuclear fusion in a reactor instead.
	reactor.engr.wisc.edu /glossary.html (795 words)

	FISSION PRODUCT DISPOSAL IN PERMANENT ICE FIELDS
		The remaining fission products will have to be isolated from the environment for 800 years after which they are no more hazardous than the uranium ore from which they originated [2], or the uranium ore that must also exist naturally under such large icecaps as the Greenland icecap.
		From Table 2 it is seen that the beta activity of the major fission products after ten years of storage contributes 1470 W. per tonne of spent fuel, or 3.3x1470=4851 W. for the 3.3 tons that correspond to the 100 kg of fission product oxides in the core volume.
		The remaining fission products will have to be isolated from the environment for 800 years after which they are no more hazardous than the uranium ore from which they originated, or the uranium ore that must also exist naturally under such large icecaps as the Greenland icecap.
	www.worldenergy.org /wec-geis/publications/default/tech_papers/17th_congress/3_2_10.asp (3486 words)

	SCOPE 50 - Radioecology after Chernobyl, Chapter1, Sources
		A primary fission product is usually the starting point of a sequence of decays, each daughter nuclide tending to have a half-life longer than its parent, until a stable nuclide is reached.
		Since residual uranium, fission products and actinide elements are contained in the fuel upon discharge from the reactor, a period of on-site storage (in reactor ponds) is necessary to allow the decay of short-lived radioactivity prior to transport for reprocessing.
		Fission and activation products dispersed as global fallout from nuclear tests are the most important, and to a lesser extent are those from reactor accidents and other releases from peaceful uses of nuclear energy such as fuel reprocessing.
	www.icsu-scope.org /downloadpubs/scope50/chapter01.html (8734 words)

	technetium - Hutchinson encyclopedia article about technetium
		It occurs in nature only in extremely minute amounts, produced as a fission product from uranium in pitchblende and other uranium ores.
		It was synthesized in 1937 (named in 1947) by Italian physicists Carlo Perrier and Emilio Segrè, who bombarded molybdenum with deuterons, looking to fill a gap in the periodic table of the elements (at that time it was considered not to occur in nature).
		It was later isolated in larger amounts from the fission product debris of uranium fuel in nuclear reactors.
	encyclopedia.farlex.com /technetium (183 words)

	[No title]
		Fission Product Selection Criteria There is no unique way to define the nuclear properties of a pseudo fission product.
		To separate out the important fission products a set of criteria was developed, based on the analytical equations that govern the build-up and decay of the nuclides.
		The pseudo fission product multigroup constants were calculated by a weighted average of the constants of the constituents.
	www-rcp.ijs.si /~wlup/documents/Portf99.doc (1859 words)

	IEER: Energy & Security No. 13 / Science for Democratic Action V8N3: Energy for Peace
		Fission transmutation reactions produce mostly short-lived fission products that decay into stable elements, but some of these short-lived fission products can also decay into long-lived ones.
		Because fuel fabrication does not involve the production of liquid waste, its effects are mainly restricted to workers and are on the same order as for workers in the reprocessing sector.
		Fission products are radioactive (generally by beta decay).
	www.ieer.org /sdafiles/vol_8/8-3/transm.html (3737 words)

	EPRI: Fission Product Benchmarking for Burnup Credit Applications: Progress Report (Site not responding. Last check: 2007-10-13)
		Further progress is achievable by incorporating the negative reactivity effects of a subset of neutron-absorbing fission product isotopes.
		Their calculations validated the French approach of obtaining the majority of available credit from all fission products by considering a subset of only six fission product isotopes.
		Comparing this negligible risk component to the reduction in common transport risks due to a reduced number of fuel shipments leads to the conclusion that using burnup credit is preferable to using the fresh fuel assumption.
	www.epri.com /OrderableitemDesc.asp?product_id=000000000001002879&targetnid=262270&value=03T023035&marketnid=262175&oitype=1&searchdate=12/3/2002 (751 words)

	Active Skim View of: 3. FISSION PRODUCTS
		The recoil level of fission product release may be ' + 'estimated by a number of techniques using the noble gas activirv data or the soluble fission product activities measured in reactor water.
		The steady ' + 'state concentrations of fission product activities in water and steam systems vary from reactor to reactor, sometimes by two to three orders of magnitude, ' + 'depending on the size of the fuel defect, the number of defective fuel rods in the core, and the capacity of reactor water cleanup system.
		The steady state concentrations of fission ' + 'product activities in water and steam systems vary from reactor to reactor, sometimes by two to three orders of magnitude, depending on the size of the ' + 'fuel defect, the number of defective fuel rods in the core, and the capacity of reactor water cleanup system.
	www.nap.edu /nap-cgi/skimit.cgi?isbn=NI000156&chap=31-68 (10306 words)

	Nuclear Fission Fragments
		When uranium-235 undergoes fission, the average of the fragment mass is about 118, but very few fragments near that average are found.
		Most of these fission fragments are highly unstable (radioactive), and some of them such as cesium-137 and strontium-90 are extremely dangerous when released to the environment.
		This particular set of fragments from uranium-235 fission undergoes a series of beta decays to form stable end products.
	hyperphysics.phy-astr.gsu.edu /hbase/nucene/fisfrag.html (517 words)

	Search Results for product - Encyclopædia Britannica
		Whiteware products are often differentiated into three main classes—porous, semivitreous, and vitreous—according to their degree of vitrification (and resulting porosity).
		In theory, at least, the number and kind of possible chemical products are equal to those of the products made from petroleum.
		Cranberries and dairy products are among the most important agricultural products in the northeast.
	www.britannica.com /search?query=product&submit=Find&source=MWTEXT (531 words)

	SDV Nuclear Glossary (Site not responding. Last check: 2007-10-13)
		Fission products formed by the decay of these nuclides are not included.
		A neutron emitted as a nuclide undergoes fission.
		Xe are two poisons that are produced as fission products with a high yield and which have an impact on reactor operations.
	glossary.dataenabled.com /sdvglossary_F.html (1049 words)

	Burn-up Measurements on FBTR Spent Fuel (Site not responding. Last check: 2007-10-13)
		The measurement of burn-up involves the identification, separation and determination of the concentration of a suitable fission product monitor followed by the correlation of the concentration of fission product monitor and that of heavy elements such as uranium and plutonium to the total number of fissions in the fuel.
		Nd as the fission product monitor yielded a burn-up value that is slightly lower : 1.95 atom per cent fission.
		In this method, the concentration of selected fission product elements is measured by chromatographic separation coupled with on-line spectrophotometric measurement.
	www.igcar.ernet.in /lis/nl42/ta1.html (1026 words)

	Fission products - evaluated neutron reactions and decay data
		The JNDC Nuclear Data Library of Fission Products, second version has been received from the Japanese Nuclear Data Committee in February 1991.
		The library contains nuclear decay data and fission yield data for 1078 unstable and 149 stable fission product nuclides, and neutron cross-section data for 166 nuclides.
		ENDF/B-5 Fission Products Library (Rev. 2), cross-sections and decay data for 877 fission-product nuclides.
	www-nds.iaea.org /indg_eval_fpcsdd.html (474 words)

	IEER Report: Transmutation - Nuclear Alchemy Gamble
		One of the biggest obstacles facing the nuclear industry is what to do with the nuclear waste generated in the form of spent fuel discharged from commercial reactors or in the form of high-level waste originating from the extraction of plutonium from spent fuel.
		Of the long-lived fission products, only technetium-99 and iodine-129 have the potential to be fabricated into targets and transmuted in a reactor.
		The actinides could either undergo fission or capture a neutron, though for the purposes of transmutation, which is trying to reduce the amount of actinides, fission is preferred.
	www.ieer.org /reports/transm/summary.html (6941 words)

	1
		Direct yield (y): Fraction of the total fissions that yield the nuclide of interest.
		Many of FPs have such short half-lives that no accurate measure of their direct yields as primary fission products is available.
		): Fraction of fissions that directly yield the nuclide of interest and its radioactive decay precursors in the constant-mass fission product chain, i.e., sum of the direct yields of that nuclide and its decay precursors.
	www.nuc.berkeley.edu /waste/NE124/Section1.3.3/Section1.3.3.html (256 words)

	Article in IAEA-TECDOC--358: Gaseous and metallic fission product transport characteristics of a modular pebble bed ...
		Models have been developed to predict the transport of metallic and gaseous fission products (FPs) through the multilayered fuel particle coatings and the graphite matrix of the core under accident conditions.
		The amount of fission products released is small and the release occurs slowly over a period of days as the pebble heats up.
		The results of this study show that the most effective barrier to fission products is the coated fuel particle.
	www.iaea.org /inis/aws/htgr/abstracts/abst_17036728.html (389 words)

	Symmetric and asymmetric fission in $^{232}$Th($p$,f) at 190 MeV (Site not responding. Last check: 2007-10-13)
		In reactions at higher energies, the role of multi-chance fission as well as the influence of a high excitation energy on the fission fragment properties can be investigated.
		Especially in the region of the actinides where symmetric and asymmetric fission modes compete, an increase in excitation energy will have a strong effect on the resulting fission-product mass yields.
		This leads to mass distributions encompassing contributions of many fissioning nuclides, with their own ratio of symmetric to asymmetric fission depending on the isotope and the excitation energy.
	www.kvi.nl /~annrep/ar1998/kviar_1998_c1_5.html (295 words)

	The Holocaust Bomb: A Question of Time
		Both sets of drawings showed separate fission and fusion stages inside opposite ends of a hollow cylinder, an idea that the government later argued in court was one of three essential elements of the H-bomb secret: separation of stages.
		By the mid-1940s, it was known that a lot of fission could supply the heat to cause a little fusion, and that a little fusion could in turn produce the neutrons to cause a lot more fission, with the ultimate yield being limited only by the amount of uranium in the bomb.
		In uranium fission, 90% of the energy is released as the kinetic energy of highly-charged, fully- ionized fission fragments.
	www.fas.org /sgp/eprint/morland.html (19378 words)

	Visits & events 2
		The first day dealt with nuclear waste management, in particular transmutation of transuranium isotopes and fission products in thermal and fast neutron fluxes, and high-energy proton induced reactions.
		On the second day, contributions on the status of reactor and accelerator based radioactive beam facilities, on features of very neutron rich nuclei, and on the yield of ternary particles in spontaneous and thermal neutron induced fission reactions were dealt with.
		In particular, spectroscopic data on very neutron rich nuclei emanating from thermal neutron fission were presented, giving insight into the change of the parameters of the nuclear potential in going to extreme values of isospin.
	www.ill.fr /News/29/29_visi2.htm (574 words)

	Tb004: Radioactivity Data
		Fission reactor calculations require good capture cross sections for about 200 important fission-product nuclides, and they need capture, fission, and higher reactions for a large number of actinide isotopes.
		These distributions are very important for the operation of fission power reactors; they affect parasitic absorption, on-power decay heat, decay heat after shutdown or emergency scram, and delayed neutrons (which are important factors for reactor kinetics and control).
		This calculation requires you to solve a set of coupled differential equations stating the balance between producing (by a reaction, or as a fission product) and destroying (by a reaction, or by decay) each possible nuclide.
	t2.lanl.gov /tour/tb004.html (1234 words)

Try your search on: Qwika (all wikis)