National Institute of Standards and Technology

National Institute of Standards and Technology

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. However, this function has some obvious limits as it does not accurately fit the data points of the dose response curve. This results in unreliable equivalent dose DE values which are highly dependent on the maximum irradiation dose. View PDF. Save to Library. Create Alert. Launch Research Feed. Share This Paper. Voinchet, Gongming Yin, … J.

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Aluminium 26 Al , Al is a radioactive isotope of the chemical element aluminium , decaying by either positron emission or electron capture to stable magnesium The half-life of 26 Al is 7. This is far too short for the isotope to survive as a primordial nuclide , but a small amount of it is produced by collisions of atoms with cosmic ray protons. Decay of aluminium also produces gamma rays and x-rays. Contact with 26 Al may result in radiological contamination necessitating special tools for transfer, use, and storage.

Aluminium can be used to calculate the terrestrial age of meteorites and comets.

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Aluminium powder, derived from bauxite, is a key ingredient in solid-fuel propellants used to launch missiles. Iran started producing the powder for military use more than five years ago, according to the former official, who from until was head of public relations and also parliamentary affairs envoy in the office of the vice president for executive affairs, which at the time oversaw some economic policies.

The ex-official, Amir Moghadam, said he visited the little-known facility twice and that production was continuing when he left Iran in Reuters reviewed more than a dozen documents relating to the aluminium powder project and people involved, dating from to Iran has long said its missile programme is solely defensive. Mohammad Tehrani Moghadam did not respond to requests for comment.

He is unrelated to Amir Moghadam, the former official who detailed the programme to Reuters. The former Iranian official, who now lives in France, says he left Iran in after being accused of stirring unrest following public comments he made alleging the corruption of some government officials. The sanctions also target the Revolutionary Guards and third parties that provide material support to or conduct certain transactions with the Guards. The U. Treasury has a primary role in administering sanctions.

Jose Luis Diaz, spokesman for the U. Producing its own aluminium powder for use in missile propellants would give Iran greater control of the supply chain and quality, said Michael Elleman, Washington, DC-based director of the non-proliferation and nuclear policy programme at the International Institute for Strategic Studies, a security think tank.

Optimum aluminum absorber thickness of a small X-ray irradiator for equivalent dose determination

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University of Erlangen-Nuremberg. Aluminum is regularly taken up with the daily diet. It is also used in antiperspirants, as an adjuvant for vaccination, and in desensitization procedures. In this review, we present the scientifically documented harmful effects of aluminum on health and the threshold values associated with them.

Imports of primary aluminum from Canada today are consistent with long-term trends long pre-dating the imposition of Section tariffs,”.

These metrics are regularly updated to reflect usage leading up to the last few days. Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online.

Clicking on the donut icon will load a page at altmetric. Find more information on the Altmetric Attention Score and how the score is calculated. Recently, awareness has been raised concerning the need to decrease the total environmental footprint throughout the life cycle of a medicine, including the packaging materials.

Aluminum, a highly energy-intensive metal, is widely used in blister packages together with polymers. However, these blister packages suffer from poor recyclability, with the clear majority of waste blister packages WBPs disposed of in municipal solid waste, therefore often being incinerated. In the current study, the separation of aluminum from the polymer in WPBs was investigated to make Al available for direct recycling at a secondary Al facility.

Moreover, the polymer layer also gave indications of the presence of Cl. WPBs were subjected to electrohydraulic fragmentation, where the effects of the gap between electrodes 10—40 mm , the amount of pulses 50— pulses , pulse frequency 2—5 Hz , and discharge voltage — kV on the separation process were systematically investigated.

Kentucky’s aluminum boom builds with $1.3 billion investment in Greenup

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Pittsburgh — Industry groups and politicians traded arguments this week on whether Section tariffs should be reinstated on US aluminum imports from Canada as the United States-Mexico-Canada Agreement, the updated North American trade pact, is scheduled to take effect July 1. US Trade Representative Robert Lighthizer said the reinstatement of tariffs on Canada, which received an exemption from the tariffs in , would be an option if it is determined that aluminum imports from the country have risen.

Pennsylvania Senator Pat Toomey said the tariffs on steel and aluminum have harmed the US manufacturing industry. So when tariffs raise the cost of the steel and aluminum, those are higher cost inputs for those manufacturers who are less able to compete with foreign companies that are not subject to those taxes. The tariffs on Canada were critical in creating jobs and growing primary aluminum capacity in the US, according to Duffy. Duffy said several smelters in the US are now at risk of closure due to Canada’s exemption and subsequent import volumes.

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The Canadian Press Staff. Legislature in Victoria, on Monday, January 13, A statement from the premier’s office says Canadian aluminum exports do not harm the U. Horgan’s statement says his government will continue to defend B. Deputy Prime Minister Chrystia Freeland says Canada will match the tariff cost dollar-for-dollar , potentially targeting U. Freeland says consultations with the domestic industry will determine which target items will strongly impact the U.

Vaccines contain adjuvants such as pertussis toxins and aluminum compounds that also bias towards allergy. Adjuvants also increase the.

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That is, between technologies related to attack and those related to defense. Elements of power and geopolitical keys” the importance of development and technology in the current world order. During the last few months, Iran has demonstrated the power of its military capacity, despite the sanctions imposed by the United States. An investigation carried out by the Reuters news agency has revealed that, in the middle of the desert in the province of Khorasan, in the northeast of Iran, the Islamic Republic is producing aluminium powder for its missile programme.

According to the report, based on the testimony of a former Iranian government official and on documents to which Reuters has had access, the Islamic Revolutionary Guard Corps – a branch of the Iranian Armed Forces – has been responsible for leading this procedure in a secret facility located near the town of Jajarm, where there is a secret facility that for the last few years has been producing aluminum powder for use in a missile program.

Aluminium powder, derived from bauxite, is essential for creating solid fuel engines used to launch missiles. Iran began manufacturing this product more than five years ago, according to former official Amir Moghadam, interviewed by Reuters, who from to was head of public relations and head of the parliamentary affairs department in the office of the vice president of executive affairs, which at the time oversaw some economic policies.

Moghadam has admitted that he visited the facility twice and that production continued after he left the Islamic Republic.

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Continue to access RSC content when you are not at your institution. Follow our step-by-step guide. Aside from simple Lewis acid—base chemistry, the reaction chemistry of aluminacyclopentadienes, which are commonly referred to as aluminoles or simply alumoles, remains relatively underdeveloped. To date, few attempts to extend their inherent insertion and cycloaddition reactivity to the construction of stable aluminum-containing heterocycles have been reported.

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A small X-ray irradiator Varian VFJ X-ray tube has some advantages over the conventional radioactive sources for equivalent dose determination, as required for example in the process of luminescence dating of sediments and sherds. One advantage of the X-ray irradiator is that the photon energies below a few keV, which may cause an error in the equivalent dose value, can be eliminated by an aluminum absorber. This is a preview of subscription content, log in to check access.

Rent this article via DeepDyve. Reprints and Permissions. Hong, D. Optimum aluminum absorber thickness of a small X-ray irradiator for equivalent dose determination. J Radioanal Nucl Chem , — Download citation. Issue Date : August Search SpringerLink Search. Summary A small X-ray irradiator Varian VFJ X-ray tube has some advantages over the conventional radioactive sources for equivalent dose determination, as required for example in the process of luminescence dating of sediments and sherds.

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