gross beta activities and beryllium-7 concentrations in surface air
نویسندگان
چکیده
abstract background: were made each week during year 2002 from samples of atmospheric aerosols filtered from theair at tehran nuclear research center.measurement of gross beta activities and cosmogenic beryllium-7 concentrationsmaterials and methodssampler at the nuclear research center meteorological station in tehran (40contents of samples were determined with semiconductor gamma spectrometry. the long-livedbeta activity, i.e. total beta activity measured four days after the end of sampling (after decay of: the aerosol samples were collected weekly with high-volume airo 35. n). the 7be220the long-lived beta activity consists mainly of amount of artificial radionuclides in the air is negligible.rn progeny and short-lived 220rn progeny), was assessed with an automatic beta analyzer.210bi, the daughter nuclide of 210pb, as theresults: lognormal distribution during the study period 2002. the arithmetic mean of annual concentrationsof the air concentrations of both the 7be and the long-lived beta activity displayed a7be and 210 pb was 6.30 and 0.50 mbqm-3, respectively .conclusion: beta activities are partially correlated. both have maximum concentrations during warmmid-year months. despite the different origins, the concentrations of both the 7be and the long.livediran. j. radiat. res., 2005 2 (4): 211-213
منابع مشابه
Gross beta activities and Beryllium-7 concentrations in surface air
ABSTRACT Background: were made each week during year 2002 from samples of atmospheric aerosols filtered from theair at Tehran Nuclear Research Center.Measurement of gross beta activities and cosmogenic Beryllium-7 concentrationsMaterials and Methodssampler at the Nuclear Research Center meteorological station in Tehran (40contents of samples were determined with semiconductor gamma spectrometry...
متن کاملAnalysis of gross alpha, gross beta activities and beryllium- 7 concentrations in surface air: their variation and statistical prediction model
Background: Measurement of gross , gross activities, and cosmogenic beryllium-7 (7Be) concentrations were made both daily and weekly during the years 2001- 2004 from samples of atmospheric aerosols filtered from the air at Tehran Nuclear Research Center (35 41' N) and Zahedan (28 29' N). Materials and Methods: Weekly aerosol samples were collected with the high-volume air samplers on cellul...
متن کاملanalysis of gross alpha, gross beta activities and beryllium- 7 concentrations in surface air: their variation and statistical prediction model
background: measurement of gross , gross activities, and cosmogenic beryllium-7 (7be) concentrations were made both daily and weekly during the years 2001- 2004 from samples of atmospheric aerosols filtered from the air at tehran nuclear research center (35 41' n) and zahedan (28 29' n). materials and methods: weekly aerosol samples were collected with the high-volume air samplers on ...
متن کاملAnalysis of gross alpha, gross beta activities and beryllium- 7 concentrations in surface air: their variation and statistical prediction model
Radioactivity in the atmosphere originates from natural radioactive decay, cosmogenic production, nuclear weapons testing and nuclear accidents. Results of the measurements have shown that cosmogenic 7Be is the only gamma emitting nuclide found in the atmosphere of Iran (1). 7Be (t1/2 = 53d) is one of the radioactive products of the bombardment of the atmosphere by cosmic rays. About 75% of 7Be...
متن کاملAnalysis of gross alpha, gross beta activities and beryllium-7 concentrations in surface air: their variations and statistical prediction model.
Measurement of gross alpha, gross beta activities and cosmogenic beryllium-7 (7Be) concentrations were made both daily and weekly during the years 2001--2004 from samples of atmospheric aerosols filtered from the air at Tehran Nuclear Research Center (35 41' N) and Zahedan (28 29' N). Weekly aerosol samples collected with the high-volume air samplers on cellulose filters were used to determine ...
متن کاملBeryllium-7 in ocean water.
Concentration of the radio nuclide beryllium-7, produced by cosmic rays, was measured in waters collected from both the Atlantic and Pacific oceans. This short-lived nuclide is well suited as a tracer for interactions at the air-sea interface and for the measurement of rapid mixing processes in the surface layer of the ocean.
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عنوان ژورنال:
iranian journal of radiation researchجلد ۲، شماره ۴، صفحات ۲۱۱-۲۱۳
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