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:9/2/2014)... considered the most ideal source of nutrition for ... role in the evolution and civilizations of human ... a large number of bacterial species, including some ... no surprise to scientists and physicians. , Indeed, ... be the result of co-evolutionary and co-adaptive interactions ...
(Date:9/2/2014)... 2014 A study published in the September ... American Academy of Child and Adolescent Psychiatry ... psychiatric diagnosis had an increased risk of developing ... Using data from the nationwide Danish registers, a ... Nielsen, Psychiatry, Aalborg University Hospital, Denmark, studied 48,299children ...
(Date:9/2/2014)... N.C. -- When you accidentally touch a hot oven, ... the basic neural circuits involved in sensing and responding ... the molecular players. , Duke researchers have made a ... involved in pain in worms, and have built a ... 2 in Nature Communications , may help direct ...
Breaking Biology News(10 mins):Are human breast milk microbiome 'neutral'? 2Are human breast milk microbiome 'neutral'? 3Risk of diabetes in children and adolescents exposed to antipsychotics 2Surprising new role for calcium in sensing pain 2Surprising new role for calcium in sensing pain 3
... Department of Community Health (MDCH) has unveiled the ... includes significant recommendations developed from medical research conducted ... Eunice Kennedy Shriver National Institute for Child Health ... at the Wayne State University School of Medicine. ...
... press release is available in German . ... great happiness among inhabitants. On those days the air is ... difficult and unhealthy. According to the latest calculations of Max ... most of world population in 2050 if no counteractive measures ...
... Butterflies learn faster when a flower is rewarding than when ... when it comes to speed of learning with rewards. These ... Kandori and Takafumi Yamaki from Kinki University in Japan. Their ... Science of Nature , is the first to investigate and ...
Cached Biology News:State of Michigan adopts NIH's PRB progesterone therapy to combat infant mortality 2State of Michigan adopts NIH's PRB progesterone therapy to combat infant mortality 3Worldwide increase of air pollution 2Rewarding work for butterflies 2
(Date:9/2/2014)... Sept. 2, 2014 Orexigen Therapeutics, Inc. (Nasdaq: ... Patent and Trademark Office (PTO) has issued a patent ... for weight loss. NB32 is a fixed-dose combination of ... U.S. Patent No. 8,815,889 claims methods for treating insulin ... patent expires in 2024. If NB32 is approved for ...
(Date:9/2/2014)... , Sept. 2, 2014 /PRNewswire/ - Oncothyreon Inc. (Nasdaq: ... President and Chief Executive Officer, will present at the Rodman ... New York on Tuesday, Sept. 9, ... and archived webcast of the presentation will be accessible by ... & Events" section. About Oncothyreon ...
(Date:9/2/2014)... Inc. (TSXV: BRM) ("Biorem" or "the Company") today announced three ... large odour control systems for waste water treatment plants in ... consistent with the market resurgence in North America ... "After a difficult period of restraint in our core municipal ... growth. Our lower cost structure, technology improvements and supply chain ...
(Date:9/2/2014)... BETHESDA, Md. , Sept. 2, 2014  Spherix ... fostering and monetization of intellectual property, today announced that ... three patents to the Company in the month of ... of patents.  The issued patents are: ... , U.S.RE45,081 issued August 19, 2014; and ...
Breaking Biology Technology:Orexigen Expands NB32 Intellectual Property Portfolio With New U.S. Patent 2Orexigen Expands NB32 Intellectual Property Portfolio With New U.S. Patent 3Orexigen Expands NB32 Intellectual Property Portfolio With New U.S. Patent 4United States Patent & Trademark Office Issues Three New Standard Essential Patents to Spherix 2
... dispute NimbleGen releases microarrays for DNA encyclopedia ... percent Icon Interactive lands animator as client ... managemenet Teklynx releases design software for UCC-compliant ... Benitec in contract dispute , Promega , an international ...
... In his new book The Art of the ... , Guy Kawasaki, a managing director of Garage Technology ... venture capital, most entrepreneurs would be better off spending ... relationships. , ,This is a good message, but ...
... will have a new resource to help them navigate ... related centers on campus. , ,The Office of Corporate ... , which is to include events, publications and both ... to UW=-Madison faculty, staff and students. , ,Were one ...
Cached Biology Technology:Tech Digest (11/10/2004) 2Sarcasm and rainmaking advice coexist in The Art of the Start 2Sarcasm and rainmaking advice coexist in The Art of the Start 3Sarcasm and rainmaking advice coexist in The Art of the Start 4Sarcasm and rainmaking advice coexist in The Art of the Start 5UW plans entrepreneurship program to link campus resources 2
Polyclonal Antibody to CLAN...
Request Info...
IRF7 Immunogen: Synthetic peptide corresponding to residues E(463) G T Q R E G V S S L D S S S(477) of human IRF7. Storage: -20 C, Avoid Freeze/Thaw Cycles...
Rabbit polyclonal to TetR ( Abpromise for all tested applications). Antigen: Synthetic peptide: AQKLGVEQPTLYWHVKNKR, corresponding to amino acids 31 - 49 of TetR...
Biology Products: