US2942938A – Method of dissolving massive plutonium – Google Patents

The Finnish newspaper Iltahleti wrote that Russian dealers recently offered its reporters bomb-grade plutonium, a sample of which was proven to be genuine by a laboratory test. The reporters said they contacted the dealers together with British and German television reporters. One of the dealers, ‘Gennadiy,’ stated that he could deliver kilograms of plutonium in 10 days. He also offered two ‘ missiles with built-in warheads. This article is part of a collection examining reported incidents of nuclear or radioactive materials trafficking in or originating from the Newly Independent States. NTI has developed interactive educational tools for anyone who wants to learn more about the threat posed by nuclear, chemical, and biological weapons. This material is produced independently for NTI by the James Martin Center for Nonproliferation Studies at the Middlebury Institute of International Studies at Monterey and does not necessarily reflect the opinions of and has not been independently verified by NTI or its directors, officers, employees, or agents. Copyright Abstract: The Finnish newspaper Iltahleti wrote that Russian dealers recently offered its reporters bomb-grade plutonium, a sample of which was proven to be genuine by a laboratory test. July 14,

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Filed Sept. These isotopes,-known as fission products, give oif beta and gamma rays which are exceedingly harmful to humans, so that workers dealing with them must be adequately protected. Accordingly simplicity and ease of operation of methods used are of major importance in carrying out the essential remote control of any separation scheme. The exceedingly small quantities of plutonium present in relation to the residual uranium is a further complicating factor.

It is known that plutonium has an upper valency state, believed to be six, in which it forms a water soluble fluoride, and lower valency states, believed to be three.

Prior art keywords: plutonium: bismuthate: solution: oxidation: ion; Prior art date​: ; Legal status (The legal status is an assumption and is not a legal.

This paper describes rapid methods for the determination of the production date age dating of plutonium Pu materials by inductively coupled plasma mass spectrometry ICP-MS for nuclear forensic and safeguards purposes. Age dating results of two plutonium certified reference materials SRM and , currently distributed as NBL CRM and are in good agreement with the archive purification dates.

However, if such materials are diverted and then interdicted, detailed investigation is required to identify the possible origin, intended use and hazard related to the material. Such analyses, which are referred to as nuclear forensics , involve the comprehensive physical, chemical and isotopic analyses of the nuclear material as well as the interpretation of the measured parameters along with additional information on the material in question [ 2 , 3 ]. Several characteristic parameters so-called signatures of the material can be used for this purpose, such as isotopic composition of U, Pb or Sr, elemental impurities, trace-level radionuclide content, crystal structure or anionic residues [ 2 — 6 ].

This unique possibility is based on the presence of radionuclides and their radioactive decay: during its production, the radioactive material is chemically purified from the impurities, including also its radioactive decay products. After the chemical separation of a radionuclide, its radioactive progenies start to grow-in into the material. The theoretical amount of daughter nuclide formed by the decay can be calculated by the use of the radioactive decay equations Bateman equations [ 9 ].

The ratio of the daughter nuclide amount relative to the amount of its parent nuclide can be calculated as follows:. The age dating model assumes that the sample behaves as a closed system, meaning that there is no loss or increase for either the parent nuclide or for the decay products after production. If the initial concentration of the daughter nuclide is zero after the last chemical separation i. This age value and the respective production date can help either to identify the origin of the questioned unknown sample or to verify the source of the starting nuclear material used for production.

By determining the elapsed time t and knowing the reference date of the daughter-to-parent ratio measurement, the separation date of the parent nuclide can be calculated, which is referred to as the production date of the material.

Plutonium-244 dating

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide. We describe analytical methods used to accurately and precisely determine the Pu amount and isotopic composition of nuclear material obtained from chemically digested and purified environmental swipe samples using a multicollector inductively coupled plasma mass spectrometer. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center.

This paper describes rapid methods for the determination of the production date (​age dating) of plutonium (Pu) materials by inductively coupled plasma mass.

These documents contain information from to the present with details on medical examinations, individual dose measurements, addresses, causes of death, and other data necessary for epidemiologic studies and dose reconstruction. Results: Computer scanning equipment was installed. Scanning, verification, indexing, and creation of a computer database of the scanned documents were completed.

Brief Description: Phase II of this dose reconstruction project was to reconstruct time-dependent individual radiation doses to the residents of the city of Ozersk, Russia, and the surrounding area from atmospheric releases of radionuclides from nuclear weapons production activities at Mayak from to Focus was on the emission of I and dose to the thyroid glands of children. Data will support the epidemiologic study of thyroid cancer in children of Ozersk.

This should help resolve the dichotomy between the studies at Hanford no observed effect and Chernobyl large effect. The data also will determine whether these emissions are a confounding factor in the evaluation of radiogenic cancer risk in other groups under study, such as the Extended Techa River Cohort Project 1. Results to date: The Phase I feasibility study was completed on March 31, and a final report was prepared.

For the first time, an estimate of the monthly atmospheric stack releases of I from the two fuel-processing plants was prepared for the period to The final product, a dosimetry system, was delivered to the National Cancer Institute in September Brief Description: This project was the first collaborative dosimetric project between scientists of the two countries.

The project began as a one-year feasibility study to compare the two autopsy programs and progressed to a five-year project with the objective of combining and jointly analyzing the actinide metabolism data collected by the two registries: the Dosimetric Registry of the Mayak Production Association DRMPA and the United States Transuranium and Uranium Registries USTUR.

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Re-examination of all known xenon isotopic data for ordinary chondrites reveals that Pu fission xenon can be resolved in about one-fourth of the meteorites of this class. The amounts of Pu fission xenon found in these meteorites range from ca. These meteorites started to retain their xenon some — million years later than did the carbonaceous chondrites Allende, Groznaya, Mokoia, Murchison, Murray, and Renazzo which began to retain their xenon over million years ago.

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(): Temporal variations in plutonium and americium inventories and their Date/Time Start: T * Date/Time End: T

Here are 7 examples of the types of online messages that get responses. You’ ve signed up to a dating site that seems full of promising people. Plutonium age dating reloaded The results are given relative to a common reference date of 11 March date of the plutonium separation. The results obtained with and without the chemical separation agree well within measurement uncertainty. Also the ages obtained by the different chronometers give identical results concordant ages. The achievable uncertainties by the direct method for such old materials are comparable to the results measured after chemical separation.

In our separation and measurement scheme the residual Pu signal contribution was in the same order of magnitude as the progeny U signal. Measured age dating results of the plutonium certified reference materials using the different chronometers. The measured production dates of the SRM and samples agree well with the known, archive dates of production January and in December , respectively. This agreement implies that the U separation from the Pu material was complete during the purification step.

Calculated production date results of the plutonium certified reference materials for the different chronometers. The obtained absolute production dates allow for the comparison with previously reported results in the literature Fig. For ease of comparison only the values for SRM are shown here, which has been studied more extensively.

U.S. says North Korea plutonium documents date back to 1986

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Dating with plutonium can be done very precisely by using the ratio Am/​Pu (e.g. [8]). The parent nuclide Pu (T1/2 = yr) and the daughter Am​.

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The present work describes a method for the preparation and validation of plutonium age dating reference materials. The starting material was prepared using reactor-grade plutonium, which was purified using a dedicated method to guarantee high Pu recovery, while maximizing U and Am separation efficiencies.

The U and Am separation factors were determined by the addition of high-amounts of U and Am spikes and their remeasurement in the final product.

Russian Health Studies Program – Completed Projects

A thrilling narrative of scientific triumph, decades of secrecy, and the unimaginable destruction wrought by the creation of the atomic bomb. It began with plutonium, the first element ever manufactured in quantity by humans. Fearing that the Germans would be the first to weaponize the atom, the United States marshaled brilliant minds and seemingly inexhaustible bodies to find a way to create a nuclear chain reaction of inconceivable explosive power.

In a matter of months, the Hanford nuclear facility was built to produce and weaponize the enigmatic and deadly new material that would fuel atomic bombs. In the desert of eastern Washington State, far from prying eyes, scientists Glenn Seaborg, Enrico Fermi, and many thousands of others—the physicists, engineers, laborers, and support staff at the facility—manufactured plutonium for the bomb dropped on Nagasaki, and for the bombs in the current American nuclear arsenal, enabling the construction of weapons with the potential to end human civilization.

With his characteristic blend of scientific clarity and storytelling, Steve Olson asks why Hanford has been largely overlooked in histories of the Manhattan Project and the Cold War.

The United States said on Saturday documents handed over by North Korea detailed its weapons-grade plutonium program as far back as.

Swinth; Nucleonics in Aerospace, Primary Examiner,Har01d A. Dixon Attorney, Agent, or Firm-M. Lynch [57] ABSTRACT A coincidence measuring circuit responding to the output signals from first and second scintillation counters adapted respectively to respond to alpha particles and X-rays produced by a monitored environment provides reliable detection of plutonium in the presence of other radioactive elements such as radon and its daughter products.

Patent Oct. The ever increasing use of plutonium fuel establishes an important requirement to monitor the air in plutonium fuel processing plants and in reactors using plutonium fuel to assure that the maximum permissible concentration is not exceeded. A technique commonly employed involves the incorporation of an alpha counter in a standard air particulate monitor to detect the alpha particles given off by plutonium particles which are deposited on a filter.

Russian Dealers Selling Plutonium – Finnish Paper

We use cookies to provide the best experience for you. To find out more check our cookies and privacy policy. The start has been announced with the opening and repackaging of one such can for the first time. Sellafield Ltd says its long-term plan for dealing with this risk is to build a new retreatment facility, which it estimates will be operational in the mids. This will enhance the repackaging process by removing impurities in the plutonium which contribute to the degrading process.

The time of the chemical separation was registered as the reference date for age dating. The time was calculated as the average of beginning.

A provisional trial date has been set over an alleged health and safety breach by Sellafield involving an employee being exposed to plutonium. On Thursday, Carlisle Crown Court heard the Cumbria-based nuclear fuel reprocessing and decommissioning site was not ready to enter a plea until its own appointed expert had reported back their findings.

The firm is alleged to have failed to discharge its general health, safety and welfare duty to its employees, contrary to section 2 of the Health and Safety at Work Act. The maximum penalty for the offence is an unlimited fine. Craig Morris, prosecuting on behalf of the Office for Nuclear Regulation ONR , said it had lined up 20 witnesses, including a number of medical staff who handled the contamination after the event.

Oil longest losing run since on turmoil and supply. Judge James Adkin set a provisional trial date of March 25 next year at the same court. A plea and trial preparation hearing will take place on November 2. More from Energy Voice Opinion. Latest Posts. Next Post.

Properties of Plutonium Isotopes

The most important, albeit not most stable, isotope of plutonium is Pu, with a half-life of 24, years. Reference Terms. Plutonium is a radioactive, metallic, chemical element. It has the symbol Pu and the atomic number It is the element used in most modern nuclear weapons.

Tests of a comparative method of dating plutonium samples have been carried out using Pu in aqueous solution. The six samples were of known ages.

The diethylenetriaminepentaacetic acid DTPA is a chelating agent used to decorporate plutonium Pu , americium Am and curium Cm after internal contamination. The DTPA-actinide chelate is mainly excreted in urines. Hence, DTPA decorporation therapy increases and accelerates actinide excretion, which results in a decrease in the actinide systemic retention. Data on contamination events, subsequent treatments and bioassays were collected and stored in a database.

Main results of the data analysis included: descriptive statistics on the collected events of contamination and corresponding treatments protocols, which resulted in a total of injections,. However, the systematic storage in this database of information on the monitoring and treatment of contaminated workers has been discontinued since the end of the first study in This information is crucial to optimize treatment protocols and to possibly adapt the protocol on the contamination conditions.

It is also a solid foundation for communicating with workers in case a treatment is recommended.

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