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At least 379 records · Page 21Linked to original sources
PubMed1990

Radionuclide concentrations in the northern part of The Netherlands after the Chernobyl reactor accident.

Concentrations of radionuclides originating from the Chernobyl reactor accident were measured as a function of time in air, rainwater, grass, cow's milk, vegetables and dust by means of high-resolution gamma-ray spectroscopy. Special attention was paid to grass and milk originating from the same meadows. Also, milk of cows temporarily kept inside after the accident was monitored until a few days after their release from the stables. Activity ratios in various types of samples and the implication of the sheltering measures for cows are discussed.

Accidents↗
PubMed1997

Impact of the 235U series on doses from intakes of natural uranium and decay progeny.

The doses from 235U series radionuclides have often been ignored in dose assessments involving natural uranium and progeny. This is due to the relatively low abundance of 235U in natural uranium (less than 5% on an activity basis). However, inclusion of the 235U series radionuclides, especially 227Ac and 231Pa, in dose calculations can have a substantial impact on estimated inhalation doses.

Actinium↗
PubMed1999

Chernobyl-derived radiocesium in heather honey and its dependence on deposition patterns.

Gamma-ray spectra were measured from Scottish heather honey samples gathered from hive locations with associated airborne gamma-ray survey data. The honeys all contained radiocesium, with activity concentrations ranging from 43-680 Bq kg(-1) 137Cs, and 134Cs/137Cs ratios consistent with Chernobyl deposition. Activity concentrations in honey were highly correlated with ground deposition within 2.5 km of the hive location over two successive years. Both isotope ratios and the quantitative relationships between environmental and food levels suggest that weapons testing fallout is significantly less available than recent deposition. The implications for design of future monitoring programs and radiological consequences are discussed. The whole-body retention of 137Cs in honey ingested by a volunteer was consistent with the ICRP's metabolic model for cesium.

Air Pollutants, Radioactive↗
PubMed2004

The deposition and translocation of methyl iodide by crops.

Organic forms of radioactive iodine are released during routine and accidental releases from the nuclear industry. Methyl iodide is often the predominant species in these releases. This paper describes the results of a study to determine the deposition, allocation, and loss of radioiodine after crops of bean, carrot, and cabbage were exposed to CH3 125I. The deposition velocity ranged from 0.14-7.10 x 10(-4) cm s(-1), which is in line with previous studies. Translocation of radioiodine away from the leaves to other crop components was observed post exposure. The partition of radioiodine was to those crop components growing most actively at the time of exposure. This finding contradicts some previous studies and will have implications for dose assessments. Losses of radioiodine were only observed as a consequence of leaf fall. The consequences of these findings for the modeling the movement of radioiodine in crops following the deposition of methyl iodide are discussed.

Air Pollutants, Radioactive↗
PubMedDate not supplied

[Results of radiation monitoring in Moscow].

The results of assessing the radiation situation due to global fallouts, obtained from measurement of 137Cs and 90Sr in over 400 samples from natural environmental objects in Moscow in 1979-1999 have indicated that the levels of the substances in the atmospheric fallouts are in agreement with the mean Russian levels and the mean annual activity of these radionuclides in the ambient air are 6 orders lower than the allowable values laid down in NRB-99. In Moscow, the mean effective dose of external exposure to natural and cosmogenic radionuclides is no greater than 1 m3v a year. The individual effective doses of internal and external exposures of the population to global fallouts averages 13 mu k3v a year.

Air Pollutants, Radioactive↗