Radionuclides in ground-level air in Braunschweig Report of the PTB trace survey station for 1995, 1996 and 1997

Die Aktivitaetskonzentrationen der Spaltprodukte "1"3"4Cs und "1"3"7Cs sowie einiger natuerlicher Radionuklide ("7Be, "2"2Na, "4"0K, und "2"1"0Pb) in der bodennahen Luft Braunschweigs wurden #gamma#-spektrometrisch bestimmt. Wochenmittelwerte wurden gemessen, Monatsmittelwerte und Jahresmittelwerte wurden berechnet. Die langjaehrigen Schwankungen der mittleren Aktivitaetskonzentrationen werden in Diagrammen gezeigt. Die mittlere Jahresaktivitaetskonzentration des "1"3"7Cs, hervorgerufen durch resuspendierten Bodenstaub, war etwa so gross wie in den Jahren 1993 und 1994. 1997 lag sie bei 0,03% des Jahresmittelwertes von 1986 und 38% ueber dem Jahresmittelwert von 1985. 1995, 1996 und 1997 wurden sporadisch Spuren frischer Spalt- oder Aktivierungsprodukte in der bodennahen Luft nachgewiesen. Eine tabellarische Uebersicht ueber die nachgewiesenen Radionuklide und die moeglichen Emissionsquellen wird gezeigt. Aktivitaetskonzentrationen von Plutoniumisotopen in Luftstaub-Ascheproben aus Braunschweig wurden nach radiochemischer Abtrennung und Reinigung #alpha#-spektrometrisch bestimmt. Die mittleren Aktivitaetskonzentrationen der Plutoniumisotope "2"3"8Pu und "("2"3"9"+"2"4"0")Pu in der bodennahen Luft wurden in Quartalsmischproben aus den Jahren 1995, 1996 und 1997 gemessen und die entsprechenden Jahresmittelwerte berechnet. In Zusammenhang mit dem Institut fuer atomosphaerische Radioaktivitaet des Bundesamtes fuer Strahlenschutz (BfS/IAR) wurden die mittleren woechentlichen Aktivitaetskonzentrationen der Edelgasisotope "8"5Kr und "1"3"3Xe fuer die drei Berichtsjahre ermittelt. Eine Grafik zeigt in der Uebersicht die gesamte Edelgas-Messreihe von Braunschweig, die 1987 beginnt. (orig.)The activity concentrations of the fission products "1"3"4Cs and "1"3"7Cs and of some natural radionuclides ("7Be, "2"2Na, "4"0K, and "2"1"0Pb) contained in Braunschweig's ground-level air were determined by #gamma#-ray spectrometry. Mean weekly activity concentrations were measured, mean monthly and mean annual activity concentrations were calculated. Long-term fluctuations of the mean activity concentrations are shown in figures. The mean annual "1"3"7Cs activity concentration due to resuspended soil dust was on a level comparable to that of 1993 and 1994. In 1997 it was less than 0.03% of the annual mean of 1986 but still 38% higher than in 1985. In 1995, 1996 and 1997 some traces of fresh fission products and activation products were occasionally detected in ground-level air dust. A table gives an overview of the radionuclides detected and the possible sources of release. Activity concentrations of plutonium isotopes in air-dust ashes in Braunschweig were determined by #alpha#-spectrometric measurements after a radiochemical separation and purification procedure. Mean quarterly activity concentrations of plutonium isotopes in air were measured in 1995, 1996 and 1997 and the mean annual activity concentrations were calculated. In co-operation with the Institute for Atmospheric Radioactivity, which is a department of the Federal Office for Radiological Protection (BfS/IARI) the mean weekly activity concentrations of the noble gas isotopes "8"5Kr and "1"3"3Xe were measured and compiled for the three years covered by this report. A diagram gives an overview on the measurement series which was started in Braunschweig in 1987. (orig.)Summary in GermanSIGLEAvailable from TIB Hannover: RA 3143(41) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Practical experience in and improvements to aerosol sampling for trace analysis of airborne radionuclides in ground level air

In November 1989 the Polish government and the German government signed a bilateral agreement for scientific and technological co-operation. In the framework of this co-operation the Central Laboratory for Radiological Protection (CLRP), Warsaw, and the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, conducted a co-operation project in the field of monitoring the airborne radioactivity in ground level air. This progress report deals with the history of the project covering the period from July 1990 to December 1992, the scientific activities and their results. A proposal for future co-operation, which is planned for the near future, is made. (orig.)Available from TIB Hannover: RA 3143(34) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Practical experience and improvement in aerosol sampling for trace analysis of airborne radionuclides in ground level air. Pt. 2: 1993 - 1998

In November 1989 the Polish government and the German government signed a bilateral agreement on scientific and technological co-operation. In the framework of this co-operation the Central Laboratory for Radiological Protection (Centralne Laboratorium Ochrony Radiologicznej, CLOR), Warsaw, the company physik-technik-innovation (PTI), Erlangen, and the physikalisch-technische bundesanstalt (PTB), Braunschweig, conducted a co-operation project in the field of monitoring of the airborne radioactivity in ground level air. This progress report deals with the history, the scientific activities and the results of the project covering the period from July 1993 to December 1998. The co-operation, which is still continued, is based on an agreement between CLOR, PTB and PTI. (orig.)Available from TIB Hannover: RA 3143(42) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman