Navigation Links
Radioactivity: Discover the lowest amounts with new methods
Date:9/16/2008

o the otherwise possible separation of the aerosol particle at surfaces of the chamber, on the other hand. The thoron progenies which mainly accumulate on the aerosol particles, shall be measured analogously by measuring the radon progenies after their separation by means of wire meshes (free fraction) or filters (fraction attached on aerosol partiles) in a follow-up product measuring set-up. By simultaneous spectrometry of the α- and γ-radiation emitted from the sample, quantifying of all thoron progenies as well as traceability of the measurement to the national activity standard is guaranteed.

2. Improvements of low-level gamma-ray Spectrometry Systems at UDO

Abstract: The Physikalisch-Technische Bundesanstalt (PTB), the German metrology institute, operates various low-background gamma-ray spectrometry systems at the underground laboratory (UDO) in the Asse salt mine, near Braunschweig. The experiences gained with these detector systems within ten years of operation lead to various changes and improve-ments of the experimental installations. In 2004, the whole UDO facility had to be moved within the Asse mine from its former location at a depth of 925 m to the present depth of 490 m. At its new location, the radon activity concentration in air (about 60 Bq/m3) is by a factor of three higher than at the 925 m level. Therefore, it became necessary to signifi-cantly improve the shielding against radon, at least for the most sensitive detector system. This radon shield consist of an almost air-tight box which surrounds the whole passive shielding (the latter is composed of 20 cm of lead and 10 cm of electrolytic copper). In addi-tion, an improved nitrogen flashing of the inner volume of the detector chamber was realized by changes of the design. At the same time, the end-cap of this detector was exchanged with the aim to reduce the inherent background of the system (especially from 40K). The background characteristics achieved wit
'/>"/>

Contact: Dr. Dirk Arnold
dirk.arnold@ptb.de
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Mass. Generals Warren Triennial Prize honors discoverers of microRNAs
2. How are herbicides discovered?
3. TGen and Washington University researchers discover new approach to treating endometrial cancer
4. Key discovered to cold tolerance in corn
5. Researchers discover atomic bomb effect results in adult-onset thyroid cancer
6. Unexpected large monkey population discovered
7. Munich researchers discover key allergy gene
8. Johns Hopkins scientists discover what drives the development of a fatal form of malaria
9. Mount Sinai researchers discover technology that silences genes
10. MSUs discovery of plant protein holds promise for biofuel production
11. Smithsonian scientists discover new bird species
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/21/2014)... , Nov. 20, 2014 Strict laws against ... are piloting the North American and European automotive sector ... growing, gesture recognition systems that are intuitive and able ... in the industry. New analysis from ... Recognition Market in Europe and ...
(Date:11/18/2014)... BETHESDA, Md. , Nov. 17, 2014 The ... European and U.S. regulatory agencies will speak and at least ... Quality Metrics Conference at the Omni Shoreham Hotel in ... is pleased once again to have significant support from the ... and Europe in our effort to ...
(Date:11/10/2014)... detergent pods began appearing on U.S. store shelves in ... numbers ever since. The small packets can be tossed ... out a liquid or powder. The convenience, though, has ... study from researchers at Nationwide Children,s Hospital found that ... reports of 17,230 children younger than 6 years of ...
Breaking Biology News(10 mins):Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 2Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 3Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 4FDA's Janet Woodcock, EMA's Emer Cooke Headline PDA Quality Metrics Conference 2Study finds laundry detergent pods, serious poisoning risk for children 2
... Most previous studies have indicated that people in cities ... the country. By using more complex methods of analysis than ... discovered that people,s carbon emissions are practically the same in ... else, CO 2 emissions that cause climate change are ...
... Highlights: Advanced technologies create high-capacity ... was integrated easily with Army,s cellular biometric network ... Harris Corporation,s (NYSE: HRS ) ... for various mission scenarios at the Empire Challenge 2011 , ...
... being hunted to local extinction more than a century ago ... right whales of mainland New Zealand are coming home. ... time that whales from a small surviving population around remote, ... Zealand mainland. Before the onslaught of 19th century whaling, ...
Cached Biology News:City dwellers produce as much CO2 as countryside people do 2Harris Corporation's Highband Networking Radio Provides Mobile, Wideband Communications for Empire Challenge 2011 2Harris Corporation's Highband Networking Radio Provides Mobile, Wideband Communications for Empire Challenge 2011 3Fighting back from extinction, New Zealand right whale is returning home 2Fighting back from extinction, New Zealand right whale is returning home 3
(Date:11/21/2014)... 2014 Why did Stephen Hawking become ... so instantly recognizable? Why have they become icons to ... author Hilton Ratcliffe seeks out the answers to those ... to do with science. In " Stephen Hawking Smoked ... 21, 2014), Ratcliffe puts it plainly: , “It ...
(Date:11/21/2014)... , Nov. 20, 2014 Polaris ... been dosed in its Phase 1 trial of ... for the treatment of malignant pleural mesothelioma (MPM) ... is conducting clinical trials on ADI-PEG 20, both ... for the treatment of several other indications, including ...
(Date:11/21/2014)... 20, 2014 /PRNewswire/ - BIOREM Inc. (TSXV: BRM) ("Biorem" or "the Company") ... ended September 30, 2014.  Biorem,s complete 2014 third quarter financial statements ... Financial Summary:Three-months ended September 30, , Nine-months ended ... , 2014 , 2013 , ... 5,281 , 6,715 , 14,476 Gross ...
(Date:11/18/2014)... November 17, 2014 Cirrascale ... architecture blade-based and rackmount computing infrastructure, today announced ... dual-GPU accelerator throughout its GPU-enabled blade server and ... the company’s latest proprietary 80-lane Gen3 PCIe switch-enabled ... NVIDIA Tesla K80 dual-GPU accelerator cards in a ...
Breaking Biology Technology:“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 2“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 3“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 4Polaris Group Announces Treatment of First Patient in Phase 1 Study of ADI-PEG 20 plus Pemetrexed and Cisplatin in Malignant Pleural Mesothelioma And Non-Squamous Non-Small Cell Lung Carcinoma 2Biorem Reports Third Quarter Results 2Biorem Reports Third Quarter Results 3Cirrascale® Expands Multi-GPU Peering Solutions with Support for New NVIDIA Tesla K80 Dual-GPU Accelerators 2Cirrascale® Expands Multi-GPU Peering Solutions with Support for New NVIDIA Tesla K80 Dual-GPU Accelerators 3
... Rochelle, NY, April 16, 2008Biotech and pharma companies ... drug discovery work, reports Genetic Engineering & Biotechnology ... and lower cost means of testing drug candidates ... the April 15 issue of GEN ( http://www.genengnews.com/articles/chitem.aspx?aid=2437 ...
... of the laboratory and into commercial products, many have ... health and the environment. Learning more about such ... of potential products, the pace of innovation, and the ... more efficient, timely international research effort. A major challenge ...
... VALENCIA, Calif., April 16 MannKind,Corporation (Nasdaq: ... will,join the company as Corporate Vice President and ... will report to Hakan Edstrom,President and Chief Operating ... Mr. Pfeffer,s appointment follows the previously,announced retirement of ...
Cached Biology Technology:International Council on Nanotechnology launches global research needs assessment 2Matthew J. Pfeffer Joins MannKind as Corporate Vice President and Chief Financial Officer 2
... phase reagent for Virus ... & unique water insoluble ... detergents and chaotropes; Engineered ... non-envelop viruses while preserving ...
Golgi Sampler Kit 10g each...
Caveolin Sampler Kit 10g each...
Monoclonal Antibody toSynapsin I a and I b Neurofilament associated protein from mouse brain extracts (4)....
Biology Products: