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Topic: Decay product


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  Decay product - Wikipedia, the free encyclopedia
Decay products are extremely important in understanding radioactive decay and the management of radioactive waste.
The result of this is that most radionuclides do not have simply a decay product, but rather a decay chain, leading eventually to a stable nuclide.
Because of this, decay products are important to scientists in many fields who need to know the quantity or type of the parent product.
en.wikipedia.org /wiki/Decay_product   (258 words)

  
 Decay chain - Wikipedia, the free encyclopedia
Nearly all the decay products of radioactive decay are themselves radioactive.
Because of this, most radioactive substances do not decay directly to a stable state, but rather undergo a series of decays until eventually a stable isotope is reached.
Three main decay chains are observed in nature, commonly called the uranium series, the thorium series, and the actinium series, representing three of these four classes, and ending in three different, stable isotopes of lead.
en.wikipedia.org /wiki/Decay_chain   (264 words)

  
 Radon Publications
The alpha particles emitted from the radon decay products radium A (Po-218) and radium C' (Po-214) are the significant contributors to the events that are measured by the detector.
Opposite to the side of the filter where the radon decay products are deposited is a cylinder with three collimating cylindrical holes.
Decay products from up to 100 liters of air are collected on a filter in a five-minute sampling period.
www.epa.gov /radon/pubs/devprot4.html   (6674 words)

  
 Decay product -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-22)
Decay products are extremely important in understanding radioactive decay and the management of (Useless radioactive materials that are left after some laboratory or commercial process is completed) radioactive waste.
The result of this is that most radionuclides do not have simply a decay product, but rather a (Click link for more info and facts about decay chain) decay chain, leading eventually to a stable nuclide.
Thus, although uranium is not dangerously radioactive when pure, some pieces of naturally-occurring pitchblende are quite dangerous owing to their (An intensely radioactive metallic element that occurs in minute amounts in uranium ores) radium content.
www.absoluteastronomy.com /encyclopedia/d/de/decay_product.htm   (264 words)

  
 Agricultural Export Transportation Handbook - Maintaing Product Quality
Product received in Europe on pallets other than the 1200 by 1000 mm and 1200 by 800 mm pallets used in those countries may be required to be re-palletized at the port of entry, leading to additional handling costs, product damage, and pallet disposal costs.
Products listed in table 7 and table 8 at the end of this section are sensitive to chilling or freezing injury.
Products that can be shipped in refrigerated trailers and van containers are sometimes shipped by air to take advantage of brief market opportunities, such as the beginning of a season when prices are high and supply is limited.
www.ams.usda.gov /tmd/export/maintaing_product_quality.htm   (8204 words)

  
 AccuStar Labs
As the radon decay products that are collected on the filter decay, negatively charged ions generated by alpha particle radiation are collected on a positively-charged electret, thereby reducing its surface voltage.
Grab sampling measurements of radon decay product concentrations in air are performed by collecting the decay products from a known volume of air on a filter and by counting the activity on the filter during or following collection.
Sampling using these methods requires collection of radon decay products on a filter, and measuring the alpha activity of the sample with a calibrated detector at time intervals that are specific for each method.
www.accustarlabs.com /devprot4.php   (6593 words)

  
 Alpha Decay   (Site not responding. Last check: 2007-10-22)
Po decaying by the emission of an alpha particle.
In alpha decay, the atomic number changes, so the original (or parent) atoms and the decay-product (or daughter) atoms are different elements and therefore have different chemical properties.
In the alpha decay of a nucleus, the change in binding energy appears as the kinetic energy of the alpha particle and the daughter nucleus.
www.lbl.gov /nsd/education/ABC/wallchart/chapters/03/1.html   (268 words)

  
 Radon Decay Product Measurement
The measurement of radon decay products was the primary methodology used during the 1960’s to mid 1980’s as a means to monitor employee exposures in underground mines, and was the basis for clean-up efforts in certain western states where uranium mill tailings had inappropriately been used for building materials.
The correlation of actual exposure to radon decay products (WLM) to the incidence of lung cancer is the basis of the health studies from uranium miner exposures that form the foundation of EPA’s recommendations and OSHA regulations, of an action level of.02 WL.
In order to relate the measurement of radon to an equivalent amount of radon decay products, it was necessary to assume a ratio of the amount of radon decay products that are produced and available for inhalation from the amount of radon in the air.
www.coloradovintage.com /rdp.htm   (779 words)

  
 EPA - Decay Chains (EPA's Radiation Protection Program: Understanding Radiation)   (Site not responding. Last check: 2007-10-22)
If the decay products are not stable, their decay contributes to the total activity and makes planning for radiation protection more complex.
The pattern of ingrowth varies according to the relative length of the half-lives of the original radionuclide and its decay products.
The importance of understanding decay chains is illustrated by the ingrowth of radon-222 during decay of uranium-238.
www.epa.gov /radiation/understand/chain.htm   (781 words)

  
 3. A New Approach: The Simple Decay Approach
The harvested carbon is added to the "product stocks" each year, and each year a portion of the product stock is "emitted" due to product disposal or decay (using an arbitrary 10% for this example).
Instant decay emissions will be incorporated in inventories soonest, while the emissions from exponential decay may be delayed considerably longer and hence incorporated in more distant inventories (with potentially different calculation or allocation rules).
The Simple Decay approach acknowledges the delay in emissions created by products, with more benefit from the production of sawlogs since they are assumed to have the greatest potential to be used for long lived products.
www.maf.govt.nz /forestry/publications/harvested-wood-products-accounting/woodproducts04.htm   (4074 words)

  
 Absolute Ages and Radioactive Dating
The shaded area represents the decay product which is lead-206.
Look at the decay-product ratio, which is the ratio between the mass of a radioactive element and its decay product.
It will show how the half-lives, radioactive element (or decay product) and the age of the sample are related.
regentsprep.org /Regents/earthsci/radioactivedecay.htm   (593 words)

  
 Chambers   (Site not responding. Last check: 2007-10-22)
At the chambers, the device was exposed to a well-regulated radon or radon decay product concentration, the exact value of which was kept blind from the laboratory participant.
The radon decay product source will be a shielded commercial radium source from which the radon is bled off in a controlled fashion.
By EPA chamber value it is meant the radon decay product concentration, plus and minus 2 standard deviations, in WL, as determined by the EPA using whatever methodology for producing the radon decay products and for determining the concentrations they feel are appropriate.
www.radongas.org /chamberprotocols.htm   (3649 words)

  
 SDV Nuclear Glossary   (Site not responding. Last check: 2007-10-22)
The initial nuclide is known as the parent and the product nuclide is known as the daughter.
The energy released in a nuclear reaction or in radioactive decay as calculated from the difference in total energy (including rest mass) of the products (product nuclei and ejectiles) and reactants (target nuclei and projectiles).
When applied to radioactive decay, the target nucleus is the parent nuclide, the daughter nucleus is the product nuclide, and there is no projectile.
glossary.dataenabled.com /sdvglossary_radioactive_decay.html   (1184 words)

  
 12.2 Radioactive Decay
A more interesting situation occurs when the decay product in the decay of the isotope you start with is itself radioactive, and decays itself with its own half life.
(t) as the population of the decay product of the decay product.
In the previous case, the population of the decay product was p(0) minus p(t).
www-math.mit.edu /~djk/calculus_beginners/chapter12/section02.html   (660 words)

  
 Grove Software, Inc
Data displayed includes the halflives, radioactive daughter nuclides, probabilities per decay, and decay product energies for alphas, betas, positrons, electrons, X-rays, and gamma rays.
The decay chain is calculated and displayed for as many as 20 generations.
Identical daughter nuclides generated along different branches of the decay chain are alternately combined and displayed.
www.radiationsoftware.com /raddecay.html   (375 words)

  
 Progeny Group Limited
Since it is the decay products of radon that present the primary health risk associated with the presence of radon, it is logical that measurement of radon decay products would be preferable over radon gas measurements.
By measuring both radon and radon and radon decay products, one is provided with a measure of the actual risk (from radon decay products) and the potential risk (from radon gas).
If the conditions that are causing the radon decay products to be lower than the EPA's action level, such as air circulation, air filters, clean air, etc., are conditions that are expected to exist during normal occupied periods, then the radon decay product measurement takes precedence over the radon gas measurements.
www.progenygrp.com   (725 words)

  
 Indoor Radon and Radon Decay Product Measurement Device Protocols - Glossary
Beta decay is radioactive decay in which an electron is emitted from a nucleus.
Equilibrium, radioactive: A state in which the formation of atoms by decay of a parent radioactive isotope is equal to its rate of disintegration by radioactive decay.
This number was chosen because it is approximately the alpha energy released from the decay products in equilibrium with 100 pCi of Ra-222.
www.radon.com /pubs/devprot5.html   (2145 words)

  
 Rate of Growth and Decay of Product Sales in a given Market   (Site not responding. Last check: 2007-10-22)
The product death rate is proportional to the actual product population.
Adding the production required to compensate for the product's death rate to the production required to meet initial population growth we get a curve which rises to a very high initial peak and then sinks back again to a low constant demand.
Demand for the product after the market has reached saturation can be improved by shortening the product's life-span (ie: the length of service it gives before wearing out) and also by making it non-repairable.
www.robmorton.20m.com /ideology/capitalism/market/growth.htm   (488 words)

  
 Aware Electronics Corp. V-TAC Page
While testing different procedures for collecting Radon decay product from various rock samples, we noticed the "plating out" of decay product onto a metal plate was greatly enhanced if a negative charge was applied to the plate, indicating the decay product is positively charged.
The electrostatic field is very effective at attracting freshly generated Radon decay product, so much so that perhaps most, if not all, Radon decay product collects on the negatively charged plate.
Since essential all the decay product generated migrates to the charged plate, Radon equilibrium within the sealed can is not necessary to achieve maximal decay product collection, given the short half-life of the decay products of interest (20 to 40 minutes) as compared to the half-life of Radon (3.8 days).
www.aw-el.com /vtac.htm   (746 words)

  
 Modes of Radioactive Decay   (Site not responding. Last check: 2007-10-22)
The sum of the mass numbers of the products (234 + 4) is equal to the mass number of the parent nuclide (238), and the sum of the charges on the products (90 + 2) is equal to the charge on the parent nuclide.
Once again the sum of the mass numbers of the products is equal to the mass number of the parent nuclide and the sum of the charge on the products is equal to the charge on the parent nuclide.
Thus, although it is theoretically possible to observe a fourth mode of beta decay corresponding to the capture of a positron, this reaction does not occur in nature.
chemed.chem.purdue.edu /genchem/topicreview/bp/ch23/modes.html   (2923 words)

  
 What are the Radioactive Byproducts of Depleted Uranium (Uranium-238)?   (Site not responding. Last check: 2007-10-22)
When uranium ore is extracted from the earth, most of the uranium is removed from the crushed rock during the milling process, but the radioactive decay products are left in the tailings.
Thus 85 percent of the radioactivity of the original ore is discarded in the mill tailings.
The horizontal bar beside the name of each decay product indicates the "half life" of that particular substance, measured on a logarithmic scale (each half-inch to the right represents multiplication by a factor of one thousand).
www.ccnr.org /decay_U238.html   (403 words)

  
 The decay scheme   (Site not responding. Last check: 2007-10-22)
Normally the full range of decay angles is available, but in 2-to-1 processes the decay angles of the original resonance may be restrained by user cuts, e.g.
Based on the angles, the four-momenta of the decay products are constructed and boosted to the correct frame.
Based on the accepted set of angles, the correct decay product four-momenta are constructed, including previously neglected fermion masses.
www-cpd.fnal.gov /personal/mrenna/pythia6200/node72.html   (385 words)

  
 How Good are those Young-Earth Arguments: Hovind's 'Proofs'
It is a decay product of nickel-56 (with a half-life of only 6.1 days) which was produced in quantity by the explosion.
In contrast, Barnes' hypothesis of a freely decaying field cannot explain the existence, configuration, movement, or changes in the nondipole field, the fluctuations in the dipole moment, the reversals in field polarity, or the documentation in the geologic record of the continued existence of the field for more than three billion years.
Helium-4 is the product of radioactive alpha decay whereas Helium-3 is primordial.
www.talkorigins.org /faqs/hovind/howgood-yea.html   (18986 words)

  
 Tooth decay product could be boost for local economy   (Site not responding. Last check: 2007-10-22)
Imagine a product that would drastically reduce tooth decay.
At Large Scale, the plants are ground by machinery to rupture the cells and release the product in a liquid that runs through pipes into huge tanks in the facility for further processing.
Then, the green liquid is hauled across town to Planet's offices, where it's turned into a concentrate and then shipped to California for further purification and testing.
www.messenger-inquirer.com /news/kentucky/7518775.htm   (869 words)

  
 3dmodelz.com Product-Urban Decay
Welcome to the shadier side of town, with this Urban Decay props pack from 3dmodelz.
Featuring a set of 20 original props, this set is perfect for adding a gritty feel to your street scenes.
The Urban Decay pack will then be under Props, in a sub folder called Urban decay.
www.3dmodelz.com /store/productpages/urbandecay-pp.htm   (116 words)

  
 Fission products - evaluated neutron reactions and decay data
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.
The decay data include half-life, branching ratio, and total beta- and gamma-ray energies released per decay of each unstable nuclide.
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)

  
 Chapter 13.3 Notes   (Site not responding. Last check: 2007-10-22)
Radioactive elements decay and form a new product.
decay product and can calculate the length of time since the rock formed.
For example: Carbon-14 takes 5,730 years for 1/2 of its atoms to decay.
www.angelfire.com /nj/PflommScience/chap13notes3.htm   (94 words)

  
 ESP Group: Downloads   (Site not responding. Last check: 2007-10-22)
Data provided include: The elements physical properties (like density, melting point, and specific heat), and the elements radionuclides and nuclides data (such as half life, daughter nuclides, decay chain series, probabilities per decay, and decay product energies for alphas, betas, gammas, and X-rays).
The radionuclides can be graphed in the decay chain series, and in the nuclide abundance table.
Also a decay (half life) calculation can be performed, and the resulting activities can be graphed.
www.gu.edu.au /school/eng/mmt/RadDec.html   (904 words)

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