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Radiation Protection Dosimetry

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https://www.readbyqxmd.com/read/29931185/thyroid-exposure-during-18f-fdg-production-procedures
#1
Malgorzata Wrzesien
The production of radiopharmaceuticals for the needs of positron emission tomography (PET), in particular 18F-FDG, is a multi-step process performed most often by physicists and chemists. The monitoring of occupational exposure of staff employed in radiopharmaceutical production centres includes the measurement of the Hp(10) and Hp(0.07) values. Occupational exposure to ionising radiation means that the thyroid may be, among others, affected by the radiation field. This work analyses the exposure of the thyroid gland of employees of centres that produce the isotopes for PET, in particular fluorine-18...
June 20, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29931360/quantitative-and-qualitative-study-of-radon-content-in-bulgarian-mineral-waters
#2
R M Kamenova-Totzeva, A V Totzev, R M Kotova, G R Ivanova-Teneva
This study presents the results of 222Rn in 24 sources of mineral water, 54 samples from different captured natural springs and drillings. 222Rn determination was performed by direct measurement using Alpha Guard with Aqua Kit. The results for the TDS, anions (F-, Cl-, SO42-), cations (Na+, Ca2+, Mg2+), pH and temperature of the investigated mineral waters were correlated with radon content by statistical software tool IBM SPSS. In the paper are shown the results of investigated correlations between the 222Rn content and gross alpha activity, gross beta activity and specific activity of 226Ra...
June 19, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29931357/radon-and-thoron-progeny-in-dutch-dwellings
#3
R C G M Smetsers, R O Blaauboer, F Dekkers, H Slaper
Radon and thoron progenies in Dutch dwellings cause ~400 cases of lung cancer per year. Some 30% of the risk is due to thoron progeny, which demonstrates that the influence of thoron progeny is much larger than previously anticipated. This was concluded from a national survey in 2500 Dutch dwellings, built since 1930. Radon concentrations (15.6 ± 0.3 Bq m-3 on average) are correlated to type of dwelling, year of construction, ventilation system, location (soil type) and smoking behaviour of inhabitants. The survey data support the establishment of a comparatively low national reference level for radon in dwellings in the Netherlands of 100 Bq m-3, in line with recommendations by WHO and ICRP...
June 19, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29912460/bronchus-and-lung-cancer-incidence-in-population-living-around-the-former-uranium-maining-and-miling-sites
#4
Nina Chobanova, Kremena Ivanova, Zdenka Stojanovska, Trayan Atanasov
The indoor radon concentrations and lung cancer incidence in Eleshnitza village and Blagoevgrad district of Bulgaria were examined in the study reported here. The Eleshnitza was the second largest uranium mining and milling region of the country. The geometric mean of indoor radon concentration in Eleshnitza (465 Bq/m3) was higher than the geometric mean of Blagoevgrad district (78 Bq/m3). Retrospective analyses on lung cancer incidence, covering the period 1995-2012 have been shown the same trend. The results were suggestive of an existing relationship between the two variables...
June 15, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29912424/radioactive-disequilibrium-and-dynamic-of-natural-radionuclides-in-soils-in-the-state-of-pernambuco-brazil
#5
José Araújo Dos Santos Júnior, Romilton Dos Santos Amaral, Josineide Marques do Nascimento Santos, Arykerne Nascimento Casado da Silva, Lino Angel Valcárcel Rojas, Marvic Ortueta Milan, José de Almeida Maciel Neto, Jairo Dias Bezerra, Eduardo Eudes Nóbrega de Araújo
Environmental radioactivity studies have been allowed establishing radiometric patterns in several area of the earth's crust. The work was conducted through radiometric analyses of regions with high levels of radionuclides and others with no history of anomalies. The research allowed establishing the radiometric profile of soils in the state of Pernambuco, Brazil, using a gamma spectrometry system. The specific activities ranged from 16.5 to 287.5 Bq kg-1 for 238U, 2.0 to 191.7 Bq kg-1 for 226Ra, 1.3 to 281...
June 15, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29905863/assessment-of-residential-radon-exposure-in-bulgaria
#6
Bistra Kunovska, Kremena Ivanova, Victor Badulin, Martina Cenova, Antoaneta Angelova
In the light of the new ICRP requirements the first National radon survey has been conducted in Bulgaria in the period 2015-16. Indoor radon concentrations were measured for 1 y in 2778 dwellings of whole Bulgarian territory in order to obtain the systematic data for the distribution of radon. The arithmetic mean is 111 Bq m-3 and the geometric mean is 81 Bq m-3 with geometric standard deviation of 2.15. On the base of the data, an annual effective dose to the Bulgarian population due to indoor radon exposure was estimated at 5...
June 14, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29901765/the-cd-dvd-method-as-a-tool-for-the-health-physics-service-and-ventilation-diagnostics-in-underground-mines
#7
D Dimitrov, D Pressyanov
The CD/DVDs used as radon (222Rn) and thoron (220Rn) detectors can provide a sufficiently sensitive and cost-efficient option for passive radiation monitoring in underground mines. This note presents results of measurements made under real environmental conditions by CD/DVDs. Comparison with conventional diffusion chambers was made and good correspondence was observed. Correlation between 222Rn and 220Rn was studied by CD/DVDs and no signs for any correlation were observed. Dedicated study in a mine gallery showed that CD/DVDs can be successfully used for the purposes of ventilation diagnostics by identifying sources of air contaminated with radon...
June 13, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29901758/radon-risk-communication-in-bulgaria
#8
Galina Makedonska, Jana Djounova, Kremena Ivanova
The main purpose of this paper is to analyse the activities for Radon Risk Communication under the National Radon Program and to outline the main objectives in the new Radon Action Plan for developing a communication strategy. The preliminary activities were implemented under the National Radon Program. Survey via the Internet for assessment of perceptions and the level of knowledge regarding radon was conducted as a benchmark for evaluation of public awareness. The main channels which were used to inform the population were publications on websites, magazines, in TV interviews and radio (local), seminars, from which the most widely used were local seminars...
June 13, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29897581/review-of-indoor-radon-concentrations-in-schools-and-kindergartens
#9
M Zhukovsky, A Vasilyev, A Onishchenko, I Yarmoshenko
Analysis includes review of 63 national and regional indoor radon surveys in kindergartens and schools. Preliminary assessment of the worldwide population weighted characteristics of radon concentration in children's institutions is: arithmetic mean = 59 and geometric mean = 36 Bq/m3. Higher indoor radon concentrations in children's institutions in comparison with the dwellings can be explained by characteristics of ventilation, attendance regime and construction features. Special protocol of measurements in the kindergartens and schools is required...
June 12, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29897577/distribution-of-radon-gas-in-romanian-show-caves-and-radiation-safety
#10
B D Burghele, A Cucos, B Papp, Florin A Stetca, I Mirea, S Constantin
In many countries, caves can pose an economic interest for the authorities and stakeholders. The development of a show cave requires, apart from the conservation issues, to ensure the human safety by minimising the exposure to radon for cave personnel and visitors. Radon levels can vary widely from cave to cave, being directly correlated with different internal and external factors. It is therefore important to monitor radon levels before establishing the number of personnel required, so that they are not exposed to health-threatening levels of radiation...
June 12, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29897536/properties-of-thermoluminescent-cards-with-high-sensitive-gr-200a-lif-mg-cu-p-detectors-for-harshaw-automatic-reader
#11
K Tang, H Cui, H Qiao, H Fan
New DML TL cards with GR-200A detectors were developed. The TL sensitivity remains stable and the detectors were sealed firmly during the encapsulation process. The sensitivity, detection threshold, residual signal, reusability, dose response and Teflon capsule resistance of DML cards with two GR-200A detectors with diameter 3.6 mm and thickness 0.38 mm placed in positions 2 and 3 were evaluated. The detection thresholds were 0.61 μSv for the detector at position 2 and 1.15 μSv for the detector at position 3...
June 12, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29893978/radon-levels-and-%C3%B0-quivalent-dose-rates-at-the-irt-sofia-research-reactor-site
#12
Kiril Krezhov, Aleksander Mladenov, Dobromir Dimitrov
Results from radon measurements by active sampling of indoor air in the buildings within the Nuclear Scientific Experimental and Educational Centre (NSEEC) protected site at the Institute for Nuclear Research and Nuclear Energy (INRNE) are presented. The inspected buildings included in this report are the IRT research reactor structure and several auxiliary formations wherein the laundry facilities and the gamma irradiator GOU-1 (60Co source) are installed as well as the Central Alarm Station (CAS) premises...
June 11, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29893970/the-challenge-in-using-the-retrospective-assessment-of-residential-radon-concentration
#13
T Dicu, B D Burghele, D Lupulescu, A Cucos
In the present study, the contemporary indoor radon activity concentration and the surface-deposited 210Po activity were measured in 65 Romanian dwellings. The activity of trapped 210Po on the glass surface was measured using the (CR-LR) difference technique. The retrospective radon activity concentration estimated on the basis of age-adjusted 210Po activity was found to have a geometric mean of 318 Bq m-3, being higher than the geometric mean (250 Bq m-3) of the contemporary indoor radon measurements, measured with two types of track detectors (RSKS and Radtrak2®)...
June 11, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29893946/radon-222-in-soil-gas-measurements-by-compact-discs-comparison-to-diffusion-chamber-measurements
#14
K Mitev, S Georgiev, I Dimitrova, D Pressyanov
This work presents the results from simultaneous measurements of 222Rn in soil-gas by compact discs (CDs) and diffusion chambers. The measurements were performed in three terrains with high, medium and low 222Rn-in-soil-gas concentrations. Good correlations between the CD measurements and the reference diffusion chamber measurements are observed. The results indicate that it is important to apply temperature correction in the CD measurements, in order to account for the actual temperature during the exposure of the CDs in the soil...
June 11, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29873788/the-13th-symposium-on-neutron-and-ion-dosimetry-neudos-13
#15
P Olko, P Bilski, R Kopec
No abstract text is available yet for this article.
June 5, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29796629/occupational-doses-for-the-first-and-second-operators-in-lebanese-interventional-cardiology-suites
#16
C Rizk, J Farah, G Fares, F Vanhavere
The study monitored occupational dose for 12 interventional cardiologists (first operators) and 10 technicians (second operators), from 10 different Lebanese hospitals performing coronary angiography and precutaneous coronary interventions exclusively on adult patients. Each individual wore dosemeters under and over the lead apron at chest and collar level, respectively, on the wrist and next to the left eye. The total follow-up period for each first/second operator varied between two to six bimonthly monitoring periods...
May 23, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29788223/optimisation-of-a-paediatric-ct-brain-protocol-a-figure-of-merit-approach
#17
Eric Pace, Mark Borg
Paediatric head computed tomography (CT) dose optimisation was carried out using three figure-of-merits (FOMs), based on tube voltage, current, noise, volumetric computed tomography dose index (CTDIvol) and contrast-to-noise ratio (CNR). FOM1: spatial resolution and total minimum contrast level (N) against CTDIvol; FOM2: noise against CTDIvol; FOM3: CNR against CTDIvol. Stage 1: Application of FOM1 and FOM2 on a Catphan without current modulation. Stage 2: CTDIvol and noise assessed on an anthropomorphic phantom with current modulation...
May 18, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29788505/measurement-of-natural-radionuclides-and-external-radiation-exposure-due-to-fly-ash-from-a-coal-fired-power-plant-spain-deposited-on-soils-comparison-using-two-different-measurement-techniques
#18
J A Corbacho, A Baeza
The evaluation of the radiological impact in soils due to the fly-ash ponds using both in situ techniques and laboratory based measurements is presented. In order to check the in situ techniques capabilities for monitoring this type of industries, a comparison between both techniques was performed. A characterization of external radiation exposure in the fly-ash pond and in its surrounding soils was made. The associated external radiological hazard due to the fly-ash pond has been evaluated. In situ techniques could be used to determine the radiological impact on soils due to fly-ash deposition, but its use could be limited due to the associated uncertainties...
May 17, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29788424/experimental-and-computational-evaluation-of-effective-centre-from-a-long-counter-at-neutron-metrology-laboratory-in-brazil
#19
S S Fernandes, A Astuto, K C S Patrão, E S Fonseca, W W Pereira, R T Lopes
A long counter detector was manufactured by the Institute of Advanced Studies (IEAV) and was characterised in the neutron low scattering room at Brazilian National Ionising Radiation Metrology Laboratory (LNMRI/IRD) to deploy a secondary Standard for neutron fluence. The effective centre was measured experimentally with 252Cf+D2O, 252Cf, 241AmBe and 238PuBe neutron sources, having average energies from 0.55 to 4.16 MeV. The experimental arrangement and detector construction were carefully reproduced in Monte Carlo simulations, and the computational results were found to be in good agreement with those from experiment...
May 17, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29771391/age-dependent-inhalation-dose-due-to-exposure-of-short-lived-progeny-of-radon-and-thoron-for-different-age-groups-in-jammu-kashmir-himalayas
#20
Sumit Sharma, Ajay Kumar, Rohit Mehra
Dosimetric approach is used in this study for the assessment of doses due to inhalation of short lived radon/thoron progeny to the inhabitants of Udhampur district of Jammu & Kashmir. This paper also presents the activity concentrations and unattached fraction of radon and thoron progeny. The observed annual concentration of attached and unattached 222Rn and 220Rn progeny has been found to vary from 8 to 32 and 0.09 to 14 Bq/m3, 0.75 to 3.16 and 0.01 to 1.13 Bq/m3, respectively. The inhalation doses from radon progeny to different body organs of different age groups have been calculated by using the age dependent biokinetic model...
May 16, 2018: Radiation Protection Dosimetry
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