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

h an electrolytic copper end-cap equipped with a thin carbon epoxy entrance window are compared with results obtained after the change to a low-activity aluminum end-cap operated at the same detector.

In this paper, the performance of the low-level gamma-ray spectrometry systems at UDO will be described. It focuses on technical aspects and the experiences gained after changes and improvements of the most sensitive detector had been performed.

3. On Monte Carlo Simulation of HPGE Gamma-Spectrometry Systems

Abstract: A complete calibration of gamma-spectrometry systems cannot be achieved exclu-sively on the basis of experimental measurements. Comprehensive experimental calibration is especially difficult in the case of low-level measurements, when volume sources, for which a proper standard is unavailable, are measured in close to detector high efficiency configura-tions, favoring important nuclide specific coincidence-summing effects. In such cases Monte Carlo simulation methods are among the best tools available for complementing experimen-tal calibration.

A recent intercomparison of Monte Carlo codes used in gamma-ray spectrometry revealed surprising differences between the results of different codes [1]. In this work our experience in using GESPECOR and GEANT 3.21 to solve problems in gamma-ray spectrometry (with emphasis on low-level measurements) is reviewed. The focus is on the problems resulting from differences between the two codes. Several topics related to the physics database, to the simulation parameters and algorithms and to problem definition are discussed.

Differences in interaction cross sections applied in the two programs are pointed out and the consequences on the simulation results in various measurement configurations are dis-cussed.


'/>"/>

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:3/31/2015)...  Elephant Talk Communications Corp. (NYSE MKT: ETAK) ("Elephant ... Defined Network Architecture (ET Software DNA® 2.0) platforms and ... $20.4 million for the year ended December 31, 2014 ... year ended December 31, 2013. At ... its multi-year transition away from its legacy landline business ...
(Date:3/26/2015)... , March 26, 2015 The ... social, recreation and athletic club, today announced it has ... allow freedom of movement for members and staff, while ... a comprehensive process, we selected FST,s IMID Access system ... convenience for our members and staff, in addition to ...
(Date:3/24/2015)... --  NexID Biometrics LLC, whose spoof-mitigation technology boosts ... the beginning of shipments of version 2.0 of its ... based in Potsdam, N.Y. , is ... began here today at the Walter E. Washington Convention ... SDK boosts the accuracy rate range to 96.5 to ...
Breaking Biology News(10 mins):Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 2Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 3Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 4Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 5Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 6Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2NexID Begins Shipments Of Version 2.0 Fake-Finger-Detection Solution 2
... sea levels, new research indicates that cutting emissions of ... this century. The research team found that reductions ... atmosphere could temporarily forestall the rate of sea level ... avoid potentially dangerous sea level rise, we could cut ...
... bacteria use to defend themselves against viruses, has been found ... immune system. The results are scheduled for publication Sunday, ... a sort of immune system for bacteria. Its function was ... viruses that infect bacteria, from ruining the cultures used to ...
... Reserve School of Medicine have discovered a technique that ... cells destroyed in patients with multiple sclerosis, cerebral palsy ... discovery appears today in the journal Nature Biotechnology ... of myelinating cells, which provide a vital sheath of ...
Cached Biology News:Cutting specific pollutants would slow sea level rise 2Cutting specific pollutants would slow sea level rise 3Bacterial security agents go rogue 2Bacterial security agents go rogue 3Ordinary skin cells morphed into functional brain cells 2
(Date:5/5/2015)... 2015 /PRNewswire/ - Aptose Biosciences Inc. (NASDAQ: APTO, TSX: APS) ... the three months ended March 31, 2015 and provided ... in Canadian dollars. Effective July 17, ... May 31 to December 31. As a result of ... for the three months ended March 31, 2015, while ...
(Date:5/5/2015)... , May 05, 2015 Research ... has announced the addition of the ... to their offering. Macromolecules which ... undergo separation or are broken into smaller ... products. This separation requires various advanced systems ...
(Date:5/5/2015)... 2015 Reprints Desk, Inc., a Research Solutions ... to scientific, technical and medical (STM) content, today announced ... of Southeastern Research Libraries (ASERL) . ASERL ... 11 southeastern states. Founded in 1956, ASERL has a ... address the continually changing needs of its member libraries. ...
(Date:5/5/2015)... --Research and Markets ( http://www.researchandmarkets.com/research/x5gjj3/clinical ) ... Laboratory, Molecular Diagnostics and Genomic Testing Services Market ... Version" report to their offering. ... molecular diagnostics and pharmacogenics hold the promise of ... is moving out of the national and regional ...
Breaking Biology Technology:Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 2Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 3Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 4Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 5Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 6Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 7Aptose Biosciences Reports Results for the First Quarter Ended March 31, 2015 8Global Separation Systems Market in Biotechnology 2015-2019 - Trends and Forecasts for the $28 Billion Market 2Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 2Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 3Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 4Global Clinical Laboratory, Molecular Diagnostics and Genomic Testing Services Market Trends and Forecast 2015 to 2019 2
... medical equipment specialists at Medical Machines Online are announcing the release and ... AED Defibrillator. , ... San Diego, CA (PRWEB) December 31, 2008 -- ... new Philips HeartStart AED Defibrillator. This system is one of many pieces ...
... 31 The United States Food & Drug,Administration (FDA) today ... blood for HIV-1 Group M RNA, hepatitis C RNA and ... the cobas TaqScreen MPX,Test for use on the cobas s ... detection of HIV-1 Group M RNA, HIV-1 Group O RNA,HIV-2 ...
... Listed While it , Engages in Compliance ProcessCRANBURY, ... US: PTN) today reported it received notice from NYSE ... American Stock Exchange), advising Palatin that it is not ... listing standards under Section 1003 of the Exchange,s Company ...
Cached Biology Technology:Medical Machines Online Announces Release of a Brand New Philips HeartStart AED Defibrillator 2Medical Machines Online Announces Release of a Brand New Philips HeartStart AED Defibrillator 3FDA Approves Most Comprehensive System to Test Donated Blood for HIV, Hepatitis B & Hepatitis C 2FDA Approves Most Comprehensive System to Test Donated Blood for HIV, Hepatitis B & Hepatitis C 3Palatin Technologies Receives Notification Letter from NYSE Alternext US 2Palatin Technologies Receives Notification Letter from NYSE Alternext US 3
... Restriction Grade Thrombin is a highly purified ... produced with appropriate vectors. The preparation is ... and is free of detectable contaminating proteases. ... shown by certified tests to be negative ...
Rat Cardiac Fibroblasts (RCF) (>500,000 cells)...
...
Rat Aortic Smooth Muscle Cells (RAOSMC) (>500,000 cells)...
Biology Products: