External dose rate in Unirea salt mine, Slanic-Prahova, Romania

Margineanu, R.; Apostu, A.; Duliu, Octavian G.; Bercea, S.; Gomoiu, C.M.; Cristache, Carmen

doi:10.1016/j.apradiso.2009.01.030

Cited by 11 publications

(6 citation statements)

References 10 publications

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“…The measurements on the samples were made in our institute's underground laboratory at Slȃnic-Prahova; see figure 1. The laboratory was constructed and put into operation in 2006 [3]. The equivalent depth of the Unirea mine has been estimated from cosmic ray muon measurements to be 610 mwe (metres of water equivalent) [4].…”

Section: Introductionmentioning

confidence: 99%

Traces of radioactive ¹³¹ I in rainwater and milk samples in Romania

Margineanu

Mitrica

Apostu

et al. 2011

Environ. Res. Lett.

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Measurements of 131 I (T 1/2 = 8.04 days) activities have been performed in the IFIN HH (Horia Hulubei National Institute of Physics and Nuclear Engineering) underground laboratory situated in Unirea salt mine, Slȃnic-Prahova, Romania. The rainwater samples were collected starting on 27 March from Braşov and Slȃnic-Prahova. Also sheep and goat milk samples were collected in the Slȃnic, Braşov and Iaşi areas and measurements were subsequently made on them. The measurements on the samples were made at the IFIN HH's underground laboratory in an ultra-low radiation background, using a high resolution gamma-ray spectrometer equipped with a GeHP (hyperpure) detector having a full width at half-maximum of 1.80 keV at 1332.48 keV for the second 60 Co gamma ray and a relative efficiency of 22.8%. The results show a specific activity of 131 I from <0.063 to 0.75 Bq l −1 for rain. In the milk samples the specific activity varied from <0.12 to 5.2 Bq l −1 .

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Section: Introductionmentioning

confidence: 99%

Traces of radioactive ¹³¹ I in rainwater and milk samples in Romania

Margineanu

Mitrica

Apostu

et al. 2011

Environ. Res. Lett.

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“…The Physikalisch-Technische Bundesanstalt established an underground laboratory for dosimetry and spectrometry at the Asse salt mine, near Braunschweig, where a coaxial low-background HPGe detector with extended shielding was exploited [ 23 ]. A detailed investigation of the dose rate within the underground low-level background laboratories at the Unirea salt mine (Slanic-Prahova) has shown a relatively uniform distribution varying between 1.3 ± 0.3 nSv h

outside the Low-Level Background Laboratory (LLBL) and 1.6 ± 0.3 nSv h

inside it [ 24 , 25 ]. This measurement was performed by means of a calibrated scintillator rate meter.…”

Section: Introductionmentioning

confidence: 99%

“…Measurements have been performed around the water shielding for the DEAP-3600 experiment [ 5 , 20 ]. As can be seen from the report on natural gamma-ray backgrounds in the underground LLBL ([ 22 , 25 ] or [ 23 ]), the rate could be quite uniform and stable all over the lab, or it could vary (see, for example, [ 26 ]).…”

Section: Introductionmentioning

confidence: 99%

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

Golovko

Kamaev

Sun

et al. 2023

Sensors

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The paper describes a system and experimental procedure that use integrating passive detectors, such as thermoluminescent dosimeters (TLDs), for the measurement of ultra-low-level ambient dose equivalent rate values at the underground SNOLAB facility located in Sudbury, Ontario, Canada. Because these detectors are passive and can be exposed for relatively long periods of time, they can provide better sensitivity for measuring ultra-low activity levels. The final characterization of ultra-low-level ambient dose around water shielding for ongoing direct dark matter search experiments in Cube Hall at SNOLAB underground laboratory is given. The conclusion is that TLDs provide reliable results in the measurement of the ultra-low-level environmental radiation background.

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“…In the case of the second detector, the shielding was the same excepting the inner OFHC Cu of which thickness was increased to 5 cm. In this way, the radiation shielding factor was about 3600-4000 for both instruments [9][10][11][12][13] (Margineanu et al, 2008,2009, Tudor et al, 2019 The two high resolution gamma spectrometers have been e ciency calibrated using IAEA certi ed reference sources of 241 Am, 137 Cs and 60 Co and by participating in pro ciency tests organized by the IAEA (2014-2021), as well as by using the CANBERRA GENIE200 GeometryComposer routine. Under these conditions, the total experimental uncertainty concerning the 137Cs inventory was no greater than 5%.…”

Section: Radiometric Determination and Statistical Data Analysismentioning

confidence: 99%

137Cs distribution on the territory of Romania 30 years after Chernobyl accident

Blebea-Apostu

Margineanu²,

Duliu

et al. 2022

Preprint

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To estimate the contribution of Chernobyl 137Cs contamination, in 1993 and especially 2016, its total inventory was determined by gamma-ray high-resolution spectroscopy in 62 and respectively 747 soil samples covering the entire Romanian territory. This permitted us to estimate the 1993 and 2016 total 137Cs inventory to 43 ± 2 TBq and respectively to 14.1± 0.7 Tbq, the last one reduced by a factor of 3 ± 0.3. This value, about twice higher than natural disintegration suggests a significant amount of 137Cs being washed out by precipitation and, in a lower measure, incorporated into plants. At the same time, by evaluating the maximum contribution of 137Cs to the population exposure, in 1993 and especially in 2016, the supplementary annual effective dose did not exceed, the maximum accepted value of 1 mSv.

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External dose rate in Unirea salt mine, Slanic-Prahova, Romania

Cited by 11 publications

References 10 publications

Traces of radioactive ¹³¹ I in rainwater and milk samples in Romania

Traces of radioactive ¹³¹ I in rainwater and milk samples in Romania

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

137Cs distribution on the territory of Romania 30 years after Chernobyl accident

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External dose rate in Unirea salt mine, Slanic-Prahova, Romania

Cited by 11 publications

References 10 publications

Traces of radioactive 131 I in rainwater and milk samples in Romania

Traces of radioactive 131 I in rainwater and milk samples in Romania

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

137Cs distribution on the territory of Romania 30 years after Chernobyl accident

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Traces of radioactive ¹³¹ I in rainwater and milk samples in Romania

Traces of radioactive ¹³¹ I in rainwater and milk samples in Romania