Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev

Saint Petersburg, Russia

Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev

Saint Petersburg, Russia

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Sarycheva S.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev | Golikov V.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev | Kalnicky S.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev
Radiation Protection Dosimetry | Year: 2010

In Russia, especially in big cities like St. Petersburg, the annual number of interventional radiological (IR) examinations for both diagnostic and treatment purposes is increasing continuously. However, IR examinations might involve high patient doses and even the risk of skin injures that should be prevented. In this study, the exposure of patients caused by these examinations was analysed. Methods for the estimation of the effective dose (risk reduction of stochastic effects) were proposed. Thresholds for kerma-area product values that correspond to the occurrence of skin injury are also given. © The Author 2010. Published by Oxford University Press.


Ramzaev V.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev | Barkovsky A.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev | Gromov A.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev | Ivanov S.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev | Kaduka M.,Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev
Journal of Environmental Radioactivity | Year: 2014

In 2011-2013, sampling of epiphytic fruticose lichens of the genera Usnea, Bryoria and Alectoria was carried out on Sakhalin and Kuril Islands (the Sakhalin region, Russia) to investigate contamination of these organisms with the Fukushima-derived 134Cs and 137Cs. Activities of the radionuclides were determined in all 56 samples of lichens taken for the analysis. After correction for radioactive decay (on 15 March 2011), the activity concentrations ranged from 2.1 Bq kg-1 (d.w.) to 52 Bq kg-1 for 134Cs and from 2.3 Bq kg-1 to 52 Bq kg-1 for 137Cs. Cesium-134 and 137Cs activities for the whole set of lichens (n = 56) were strongly positively correlated; Spearman's rank correlation coefficient was calculated as 0.991 (P < 0.01). The activity concentrations of 134Cs and 137Cs in Usnea lichens from the Sakhalin and Kunashir islands declined with a factor of three in the period from 2011 to 2013. The average biological half-time for both cesium radionuclides in lichens of the genus Usnea is estimated as 1.3 y. The mean of 0.99 ± 0.10 and median of 0.99 were calculated for the decay corrected 134Cs/137Cs activities ratios in the lichens (n = 56). The radionuclides ratio in the lichens did not depend on location of sampling site, species and the time that had passed after the Fukushima accident. The regression analysis has shown the background pre-Fukushima level of 137Cs of 0.4 ± 0.3 Bq kg-1, whereas the ratio between the Fukushima-borne 134Cs and 137Cs in the lichens was estimated as 1.04. The 134Cs/137Cs activities ratio in lichens from the Sakhalin region is consistent with the ratios reported by others for the heavy contaminated areas on Honshu Island in Japan following the Fukushima accident. The activity concentrations of natural 7Be in lichens from the Sakhalin region varied between 100 Bq kg-1 and 600 Bq kg-1; the activity concentrations did not exhibit temporal variations during a 2y-period of observations. The applicability of epiphytic fruticose lichens as retrospective bio-monitors for the air-borne radiocesium contamination of the environment is discussed. © 2014 Elsevier Ltd.


PubMed | Saint Petersburg Research Institute of Radiation Hygiene after Professor PV Ramzaev
Type: Journal Article | Journal: Radiation protection dosimetry | Year: 2010

In Russia, especially in big cities like St. Petersburg, the annual number of interventional radiological (IR) examinations for both diagnostic and treatment purposes is increasing continuously. However, IR examinations might involve high patient doses and even the risk of skin injures that should be prevented. In this study, the exposure of patients caused by these examinations was analysed. Methods for the estimation of the effective dose (risk reduction of stochastic effects) were proposed. Thresholds for kerma-area product values that correspond to the occurrence of skin injury are also given.


PubMed | Saint Petersburg Research Institute Of Radiation Hygiene After Professor Pv Ramzaev
Type: | Journal: Journal of environmental radioactivity | Year: 2014

In 2011-2013, sampling of epiphytic fruticose lichens of the genera Usnea, Bryoria and Alectoria was carried out on Sakhalin and Kuril Islands (the Sakhalin region, Russia) to investigate contamination of these organisms with the Fukushima-derived (134)Cs and (137)Cs. Activities of the radionuclides were determined in all 56 samples of lichens taken for the analysis. After correction for radioactive decay (on 15 March 2011), the activity concentrations ranged from 2.1Bqkg(-1) (d.w.) to 52Bqkg(-1) for (134)Cs and from 2.3Bqkg(-1) to 52Bqkg(-1) for (137)Cs. Cesium-134 and (137)Cs activities for the whole set of lichens (n=56) were strongly positively correlated; Spearmans rank correlation coefficient was calculated as 0.991 (P<0.01). The activity concentrations of (134)Cs and (137)Cs in Usnea lichens from the Sakhalin and Kunashir islands declined with a factor of three in the period from 2011 to 2013. The average biological half-time for both cesium radionuclides in lichens of the genus Usnea is estimated as 1.3y. The mean of 0.990.10 and median of 0.99 were calculated for the decay corrected (134)Cs/(137)Cs activities ratios in the lichens (n=56). The radionuclides ratio in the lichens did not depend on location of sampling site, species and the time that had passed after the Fukushima accident. The regression analysis has shown the background pre-Fukushima level of (137)Cs of 0.40.3Bqkg(-1), whereas the ratio between the Fukushima-borne (134)Cs and (137)Cs in the lichens was estimated as 1.04. The (134)Cs/(137)Cs activities ratio in lichens from the Sakhalin region is consistent with the ratios reported by others for the heavy contaminated areas on Honshu Island in Japan following the Fukushima accident. The activity concentrations of natural (7)Be in lichens from the Sakhalin region varied between 100Bqkg(-1) and 600Bqkg(-1); the activity concentrations did not exhibit temporal variations during a 2y-period of observations. The applicability of epiphytic fruticose lichens as retrospective bio-monitors for the air-borne radiocesium contamination of the environment is discussed.

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