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:7/31/2014)... research, supported by the National Science Foundation (NSF), ... uniformly accelerates atmospheric warming, indicating instead that certain ... emit into the atmosphere. , The study, ... , focuses on thermokarst lakes, which occur as ... with melted fresh water, converting what was previously ...
(Date:7/31/2014)... long-term follow-up study (HPV-023; NCT00518336) shows the ... human papilloma virus (HPV) vaccine Cervarix. Women ... followed for more than nine years, and ... 100%. This is the longest follow-up report ... https://www.landesbioscience.com/journals/vaccines/article/29532/ for the full paper. , ...
(Date:7/31/2014)... of animal models against the highly infectious and virulent ... disease that kills approximately 30,000 Americans annually. The research ... Immunity . , In the study, the vaccine ... toxins produced by C. difficile , as well ... that mimics the human disease, after only two immunizations. ...
Breaking Biology News(10 mins):Certain Arctic lakes store more greenhouse gases than they release 2Sustained efficacy, immunogenicity, and safety for GlaxoSmithKline's HPV vaccine 2Sustained efficacy, immunogenicity, and safety for GlaxoSmithKline's HPV vaccine 3C. difficile vaccine proves safe, 100 percent effective in animal models 2
... CHURCH, Va., Feb. 2 CSC (NYSE: ... 12 contractors awarded a Biometrics Operations and Support Services ... Biometrics Task Force (BTF). The indefinite-delivery/indefinite-quantity (IDIQ) contract covers ... to meet the mission needs of BTF business and ...
... 25 percent of eligible African-American adolescents have received the ... Association for Cancer Research conference on the Science of ... of the treatment and might respond to more education. ... funding research to develop ways to increase the rate ...
... University is tracking the movement of the Redbay Ambrosia beetle, ... may severely affect the production of avocados, a $15 million ... in the United States near Savannah, Ga., in 2002, the ... causing widespread mortality in Redbay trees. Dr. Frank Koch, a ...
Cached Biology News:CSC Awarded Department of Defense Biometrics Contract 2African-Americans aware and accepting, but often do not receive, the HPV vaccine 2Holy guacamole: invasive beetle threatens Florida's avocados 2
(Date:8/1/2014)... 2014 One of the major revolutions taking ... which is the practice of using genomic and other ... individual biology. Personalized diagnostics—laboratory analyses that inform the practice ... lab,s future. This fall, AACC ,s first ever ... in this exciting field and the novel technologies driving ...
(Date:8/1/2014)... 1, 2014 According to a ... Market - Global Industry Analysis, Size, Share, Growth, Trends ... at USD 25.16 billion in 2013, which is expected ... a CAGR of 10.4% from 2014 to 2020. ... Increasing demand for accurate early diagnosis ...
(Date:8/1/2014)... Once a decision has been made to ... discuss how to define your tolerance for lowest cost ... Senior Director of Facilities Integration at Fluor Industrial Services, ... Services, and special guest Carrier Li, Director in Global ... they provide an examination of the Conceptual Design process ...
(Date:8/1/2014)... 2014 Cambrex Corporation (NYSE: CBM ) ... Highlights , Second quarter sales ... same period last year. , Second quarter EBITDA increased ... same period last year (see table at the end of ... excluding the impact of foreign currency, to between 13% and ...
Breaking Biology Technology:First-Ever AACC Virtual Conference to Focus on Personalized Diagnostics 2Global Biophotonics Market is Expected to Reach USD 50.20 Billion in 2020: Transparency Market Research 2Global Biophotonics Market is Expected to Reach USD 50.20 Billion in 2020: Transparency Market Research 3Global Biophotonics Market is Expected to Reach USD 50.20 Billion in 2020: Transparency Market Research 4Defining Low Cost in Your Solution for Future Facilities, New Webinar for Pharma, Biotech, Medical Device and Healthcare Companies, Hosted by Xtalks 2Cambrex Reports Second Quarter 2014 Financial Results 2Cambrex Reports Second Quarter 2014 Financial Results 3Cambrex Reports Second Quarter 2014 Financial Results 4Cambrex Reports Second Quarter 2014 Financial Results 5Cambrex Reports Second Quarter 2014 Financial Results 6Cambrex Reports Second Quarter 2014 Financial Results 7Cambrex Reports Second Quarter 2014 Financial Results 8Cambrex Reports Second Quarter 2014 Financial Results 9Cambrex Reports Second Quarter 2014 Financial Results 10Cambrex Reports Second Quarter 2014 Financial Results 11Cambrex Reports Second Quarter 2014 Financial Results 12Cambrex Reports Second Quarter 2014 Financial Results 13Cambrex Reports Second Quarter 2014 Financial Results 14Cambrex Reports Second Quarter 2014 Financial Results 15Cambrex Reports Second Quarter 2014 Financial Results 16
... 28 /PRNewswire-FirstCall/,-- Evotec AG (Frankfurt Stock Exchange: EVT) ... year ended December 31, 2007., Financial results ... in the,Company,s clinical pipeline and four major corporate ... Technologies (ET), the sale of,the Chemical Development Business ...
... CHAMPAIGN, Ill. Finding a simple and convenient ... identification has been an elusive goal. With current ... ratio too poor, sample preparation too complex or ... service., Now, researchers at the University of Illinois ...
... March 27 Local biotechnology leader,MedImmune announced ... Yiwei Li,has received the distinguished "MedImmune Advancing ... project. The company sponsored the,Montgomery County science ... and presented the award to recognize the ...
Cached Biology Technology:Evotec Announces Financial Results for 2007 2Evotec Announces Financial Results for 2007 3Evotec Announces Financial Results for 2007 4Evotec Announces Financial Results for 2007 5Evotec Announces Financial Results for 2007 6Evotec Announces Financial Results for 2007 7Evotec Announces Financial Results for 2007 8Femtogram-level chemical measurements now possible, U. of I. team reports 2Seneca Valley High School Student Receives Science Award From MedImmune 2Seneca Valley High School Student Receives Science Award From MedImmune 3
...
...
... are designed to rapidly and reliably amplify ... APA Technology. APAgene provides hassle-free, ready-to use ... necessary ingredients are provided in each kit. ... for gap filling, localized cloning of genomic ...
N,N'-Methylene-bis-acrylamide, Ultra Pure...
Biology Products: