| 1. |
- Bernhardsson, Christian, et al.
(författare)
-
Environmental radiation baseline around the Belarusian nuclear power plant – assessments in Belarus and Lithuania
- 2023
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 16<sup>th</sup> International Conference on Medical Physics - Proceedings of the 16<sup>th</sup> International Conference on Medical Physics. - 1822-5721. ; , s. 121-125
-
Konferensbidrag (refereegranskat)abstract
- Prior to the operation of the first Belarussian nuclear power plant (BelNPP), the baseline of the radiation environment was determined within a radius of about 30 km from BelNPP. This independent assessment was carried out during two expeditions in 2019. In 2022, a similar survey was carried out (during the initialoperation of BelNPP) on the Lithuanian side of the boarder. Here we present the overall project and some general results of the baseline assessments.
|
|
| 2. |
- Adliene, Diana, et al.
(författare)
-
Assessment of the environmental contamination with long-lived radionuclides around an operating RBMK reactor station
- 2006
-
Ingår i: Journal of Environmental Radioactivity. - : Elsevier BV. - 1879-1700 .- 0265-931X. ; 90:1, s. 68-77
-
Tidskriftsartikel (refereegranskat)abstract
- The presence of man-made gamma emitting radionuclides in the region within 32 km radius of the Ignalina NPP/Lithuania has been investigated during the period 2001-2004, prior to the closure of the first 4 the two operating RBMK 1500-type reactors. Gamma spectrometric measurements of various terrestrial and aquatic plants as well as of soil samples showed moderate environmental contamination with the fission product Cs-137 and with the neutron activation products Co-60 and Mn-54. Traces of the activation products Zn-65 and Ag-110m were found in the nearest vicinity of the NPP. Activity concentrations were inhomogeneously distributed in the area of interest. Moss and algae samples showed the highest uptake of radionuclides. In addition to the gamma spectrometric measurements, the levels of C-14 were determined in the same bio-indicator samples using accelerator mass spectrometry. (c) 2006 Elsevier Ltd. All rights reserved.
|
|
| 3. |
- Bernhardsson, Christian, et al.
(författare)
-
Assessment of effective dose to an individual carrying materials useful for radiation dosimetry by optically stimulated luminescence
- 2015
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 12th International Conference on Medical Physics - Proceedings of the 12th International Conference on Medical Physics. - 1822-5721. ; , s. 48-51
-
Konferensbidrag (refereegranskat)abstract
- Optically stimulated luminescence (OSL) from ordinary household salt has proven high potential for very low dose retrospective dosimetry. In the present paper other common place materials are considered and their dosimetric OSL-properties compared with household salt. The potential for assessment of the effective dose to an individual carrying such materials is investigated.
|
|
| 4. |
- Bernhardsson, Christian, et al.
(författare)
-
Household salt (NaCl) for optically stimulated luminescence dosimetry: an overview
- 2021
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 15th International Conference on Medical Physics - Proceedings of the 15th International Conference on Medical Physics. - 1822-5721. ; , s. 90-94
-
Konferensbidrag (refereegranskat)abstract
- This brief overview of the use of household salt (NaCl) in optically stimulated luminescence (OSL) dosimetry is focusing on the use of NaCl pellets. It is suggested that the most optimal use of household NaCl, in general prospective dosimetry, is to compress the salt grains to pellets and read the radiation induced signal using OSL rather than TL. A summary of the main OSL dosimetric properties is provided for two Swedish household salts, and compared to the OSL properties of 100 different salts from all over the world.
|
|
| 5. |
|
|
| 6. |
- Bernhardsson, Christian, et al.
(författare)
-
Variation in gamma dose rate in different locations following the Chernobyl accident
- 2013
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 11th International Conference on Medical Physics - Proceedings of the 11th International Conference on Medical Physics. - 1822-5721. ; , s. 127-130
-
Konferensbidrag (refereegranskat)abstract
- Radionuclides from the Chernobyl accident were released and dispersed during a limited period of time, but under different weather conditions. As a result the radionuclides were unevenly distributed on the ground. During the years the initial deposition has been altered at some locations by different processes, but remains relatively unchanged in others. Here we report on the current inhomogeneous radionuclide distribution, on both large- and small scales (1 cm2 – 10ths of km2), which on average varies a factor of 4.
|
|
| 7. |
- Bernhardsson, Christian, et al.
(författare)
-
ZERO POINT ASSESSMENT OF THE RADIATION ENVIRONMENT – EXAMPLES OF A PROGRAM APPLIED IN SWEDEN (ESS) AND IN BELARUS (BELNPP)
- 2019
-
Ingår i: MEDICAL PHYSICS IN THE BALTIC STATES : Proceedings of the 14th International Conference on Medical Physics - Proceedings of the 14th International Conference on Medical Physics. ; , s. 85-88
-
Konferensbidrag (refereegranskat)abstract
- Before commissioning of a nuclear facility it is important to determine the baseline of the radiation environment. Such baseline or Zero Point assessments can only,and uniquely, be made before start of operation of the facility and will serve several purposes when the facility is in operation. Here we report on the planning and implementation of such a Zero Point program for achieving high reproducibility and effectiveness of the assessments around two nuclear installations.
|
|
| 8. |
- Chipiga, Larisa, et al.
(författare)
-
Assesment of patient doses and possible approaches for implementation of optimization procedures in PET/CT examinations in the Russian Federation
- 2017
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 13th International Conference on Medical Physics - Proceedings of the 13th International Conference on Medical Physics. - 1822-5721. ; , s. 36-40
-
Konferensbidrag (refereegranskat)abstract
- A dose survey of positron emission tomography (PET) examinations was performed in 12 regions of the Russian Federation, where the effective dose values were assessed for the various types of PET examinations. The comparison to similar published data show that the patient doses in Russia are higher than in other countries. Low-dose CT protocols and justification of multiphase CT protocols should be considered for future optimization and radiation protection of patients.
|
|
| 9. |
- Chipiga, Larisa, et al.
(författare)
-
Comparison between measured and calculated equivalent doses in CT using anthropomorphic pediatric phantoms
- 2015
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 12th International Conference on Medical Physics - Proceedings of the 12th International Conference on Medical Physics. - 1822-5721. ; , s. 96-99
-
Konferensbidrag (refereegranskat)abstract
- Due to the significant increase in pediatric trunk computed tomography (CT) examinations, there is a need for a reliable approach of conducting effectivedose estimate for such procedures. The current study is based on two dosimetric anthropomorphic phantoms representing a 1-year and a 5-year old child. Effectiveand equivalent tissue doses from CT examinations of the trunk were determined by thermoluminescent dosimeters (TLDs) and the CT-Expo software. The results of the two investigated methods show good agreement.
|
|
| 10. |
- Chipiga, Larisa, et al.
(författare)
-
Proposal of quality assurance system for positron emission tomography in the Russian Federation
- 2019
-
Ingår i: Medical Physics in the Baltic States : Proceedings of the 14th International Conference on Medical Physics - Proceedings of the 14th International Conference on Medical Physics. - 1822-5721. ; , s. 7-12
-
Konferensbidrag (refereegranskat)abstract
- High diagnostic efficiency as well as the optimization of patient and staff doses in positron emission tomography (PET) can be achieved by implementing quality assurance program. This study was focused on the requirements and basic aspects of quality assurance (QA) in PET combined with computed tomography (CT), that include equipment quality control (QC). QA systems include methods of image QC, examination protocols, radiation monitoring and optimization of radiation protection of the staff and patients. This paper contains the proposals for the QC of equipment and diagnostic images, as well as values of diagnostic reference levels (DRLs) for identification of abnormally high patient doses and optimization of radiation protection. Authors propose the system of quality assurance in PET considering the features of Russian healthcare and radiation protection.
|
|
