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    Wyświetlanie 1-8 z 8
    Tytuł:
    Intercomparison of radon CR-39 detector systems conducted in CLORs calibration chamber
    Autorzy:
    Mamont-Cieśla, K.
    Stawarz, O.
    Karpińska, M.
    Kapała, J.
    Kozak, K.
    Grządziel, D.
    Chałupnik, S.
    Chmielewska, I.
    Olszewski, J.
    Przylibski, T. A.
    Żebrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148842.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon-222
    CR-39 track detector
    intercomparison
    RadoSys
    Opis:
    Six radon laboratories, which perform indoor radon measurements to jointly investigate temporal variations of radon concentration in houses in a couple of regions in Poland, participated in the intercomparison exercise. There are involved three commercially available Hungarian RadoSys systems and four own laboratory methods. All of them are based on the etched-track CR-39 detectors. The intercomparison was conducted in a calibration laboratory of the Central Laboratory for Radiological Protection (CLOR), Warsaw, Poland, accredited by the Polish Center for Accreditation (previously AP 101, at present AP 057). Comparison measurements were performed during three expositions in the CLOR’s radon calibration chamber under controlled normal climatic conditions and steady radon concentration. The results were referred to the value of the radon concentration determined by AlphaGUARD monitor traceable to the primary 222Rn standard in Physikalisch-Technische Bundesanstalt (PTB), Braunchweig, Germany. The mean performance ratio defined as a ratio of the reference to participant’s result range from 0.88 to 1.31.
    Źródło:
    Nukleonika; 2010, 55, 4; 589-593
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of indoor radon concentrations between selected Hungarian thermal baths
    Autorzy:
    Shahrokhi, A.
    Nagy, E.
    Csordás, A.
    Somlai, J.
    Kovács, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147307.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    AlphaGUARD
    CR-39
    EU BSS
    Hungary
    radon
    thermal bath
    Opis:
    Owing to the high potential of radon to increase the risk of lung cancer, health organizations are enforced to update their regulations and recommendations regarding indoor radon levels each year. In this study, the indoor radon concentrations of three randomly selected thermal baths in Hungary using CR-39 and an AlphaGUARD radon monitor were measured with regard to the new updated standards of the European Basic Safety Standard (EU BSS, Council Directive 2013/59/Euratom, 2014). The annual average of indoor radon concentrations in Parad Medical Bath, Igal Health Spa and Eger Turkish Bath were measured as 159 ± 19, 176 ± 27 and 301 ± 30 Bq/m3, respectively. Indoor radon concentration in all measurement locations were determined to be below the reference level, with the exception of the main pool, small pool and sparkling bath areas in the Eger Turkish Bath that were measured as 403 ± 42, 315 ± 32 and 354 ± 36 Bq/m3, respectively. In light of the results, the estimated annual average radon concentration in the thermal baths was below the EU BSS reference level of 300 Bq/m3. Personal dosimetry is required to estimate the annual effective dose from inhaled radon by the workers at the Eger Turkish Bath. This procedure is required in order to justify the application of the mitigation process of decreasing working hours, improving the ventilation rate or increasing the number of classified employees in response to the official radiation surveillance programme.
    Źródło:
    Nukleonika; 2016, 61, 3; 333-336
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of uranium concentrations in some building materials in Iraq
    Autorzy:
    Najam, L. A.
    Tawfiq, N. F.
    Yassen, Q. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148408.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium concentration
    fission tracks
    CR-39 track detectors
    building materials
    Opis:
    Eleven commonly used building construction materials were collected from several origins in Iraq and analyzed for uranium concentration using a fission track technique. The results of measurements of uranium concentration ranged between 0.22 ppm in ceramics and 1.86 ppm in marble. The obtained results were well below the allowed limit of 11.7 ppm.
    Źródło:
    Nukleonika; 2013, 58, 2; 329-331
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    D(3He,p)4He and D(d,p)3H fusion in a small plasma focus operated in a deuterium helium-3 gas mixture
    Autorzy:
    Springham, S.
    Sim, T.
    Rawat, T.
    Lee, P.
    Patran, A.
    Shutler, P.
    Tan, T.
    Lee, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147428.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    deuterium
    helium-3
    fusion
    CR-39
    track detectors
    Opis:
    Abstract A 3 kJ plasma focus was operated with a 3He-D2 gas mixture, with partial pressures in the ratio of 2:1, corresponding to an atomic number ratio of 1:1 for 3He and D atoms. The fusion reactions D(3He,p)4He and D(d,p)3H were measured simultaneously using CR-39 polymer nuclear track detectors placed inside a pinhole camera positioned on the forward plasma focus axis. A sandwich arrangement of two 1000 mi m thick CR-39 detectors enabled the simultaneous registration of two groups of protons with approximate energies of 16 MeV and 3 MeV arising from the D(3He,p)4He and D(d,p)3H reactions, respectively. Radial track density distributions were obtained from each CR-39 detector and per-shot average distributions were calculated for the two groups of protons. It is found that the D(3He,p)4He and D(d,p)3H proton yields are of similar magnitude. Comparing the experimental distributions with results from a Monte Carlo simulation, it was deduced that the D(3He,p)4He fusion is concentrated close to the plasma focus pinch column, while the D(d,p)3H fusion occurs relatively far from the pinch. The relative absence of D(d,p)3H fusion in the pinch is one significant reason for concluding that the D(3He,p)4He fusion occurring in the plasma focus pinch is not thermonuclear in origin. It is argued that the bulk of the D(3He,p)4He fusion is due to energetic 3He2+ ions incident on a deuterium target. Possible explanations for differing spatial distributions of D(3He,p)4He and D(d,p)3H fusion in the plasma focus are discussed.
    Źródło:
    Nukleonika; 2006, 51, 1; 47-53
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Outdoor radon concentration in China
    Autorzy:
    Wu, Q.
    Pan, Z.
    Liu, S.
    Wang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/146237.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    CR-39
    passive-type radon monitor
    outdoor
    nationwide survey
    Opis:
    A nationwide survey was conducted in 2014 to investigate environmental outdoor radon level in 33 provincial cities across China. The radon detector used was a passive-type solid-state nuclear track detector, CR-39. Measurements were conducted under the same condition following the quality control programme. Outdoor radon concentrations in China ranged from 3 to 30.0 Bq·m−3. The annual arithmetic and geometric mean radon concentration were 14 and 13.2 Bq·m−3, respectively. The radon concentrations in the locations near or along coastline were lower than the average value, while those located in the inland area were higher. As a whole, the result showed no big difference from the data measured during the period 1983–1998. It demonstrated that the outdoor radon concentration level in China has not been changing remarkably for 20 years.
    Źródło:
    Nukleonika; 2016, 61, 3; 373-378
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thorium nuclear fuel - thoron aspect
    Autorzy:
    Zagórski, Z. P.
    Głuszewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148763.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    CR-39
    nuclear fuel
    radon-220
    radon-222
    thorium fuel
    thoron
    Opis:
    The communication reports a serious complication connected with preparation, storage and transportation of fuel for thorium and uranium/thorium nuclear reactors. Whereas uranium fuel of any degree of enrichment is free from radium, which produces radon-222, thorium itself produces thoron (radon-220). Measurement of thoron by a routine ionization-chamber device around a small sample of 2 g thorium dioxide shows already the health endangerment situation. The presence of thoron is also confirmed by a typical solid state dosemeter (polymer CR-39), exposed to the air around ThO2 and etched afterwards with warm NaOH solution. The unavoidable presence of thoron can cause increase of price of production of nuclear fuel, demanding special approach to the method of manufacture.
    Źródło:
    Nukleonika; 2010, 55, 3; 407-408
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exposures from radon, thoron, and thoron progeny in high background radiation area in Takandeang, Mamuju, Indonesia
    Autorzy:
    Saputra, Miki Arian
    Nugraha, Eka Djatnika
    Purwanti, Tri
    Arifianto, Rokhmat
    Laksmana, Roza Indra
    Hutabarat, Richard P.
    Hosoda, Masahiro
    Tokonami, Shinji
    Powiązania:
    https://bibliotekanauki.pl/articles/146926.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    CR-39
    high background radiation area
    RADUET
    radon
    thoron
    thoron progeny
    Opis:
    The exposure from radon, thoron, and thoron progeny was measured for 45 dwellings in high background radiation area in Takandeang, Indonesia with ambient dose equivalent rate ranging from 0.34 µSv•h-1 to 1.90 µSv•h-1 . The measurement was taken using passive radon and thoron discriminative detector and thoron progeny detector. This measurement was taken from November 2018 to October 2019, and within one month the detector would be replaced with a new detector. The concentrations of radon, thoron, and thoron progeny were calculated as 42–490 Bqm−3 , 20–618 Bqm−3 , and 4–40 Bqm−3 , respectively. The concentrations for outdoor were 49–435 Bqm−3 , 23–457 Bqm−3 , and 4–37 Bqm−3 , respectively, and the annual effective dose was 9.8–28.6 mSv•y-1 . Based on the result of Spearman’s correlations analysis between the indoor radon and thoron concentrations and between the indoor thoron progeny and thoron concentrations, we suggest that exposure to thoron cannot be predicted from exposure to radon, and the equilibrium equivalent thoron concentration has a large uncertainty when it is estimated from thoron concentration assuming a single thoron equilibrium factor.
    Źródło:
    Nukleonika; 2020, 65, 2; 89-94
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Configuration of the parameters for scanner-based track detector evaluation system
    Autorzy:
    Csordás, Anita
    Tóth-Bodrogi, Edit
    Kovács, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/147714.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    background track density
    CR-39
    etching conditions
    indoor radon
    sensitivity for radon
    Opis:
    According to the new European Union Basic Safety Standards (EU-BSS), preparation of the National Radon Action Plan is obligatory for the Member States. One of the plan’s aims is to carry out an indoor radon survey to identify radon-prone areas. In the radon surveys, track detector methods are used. At the University of Pannonia (Veszprém, Hungary), a new scanner-based detector evaluation system has been developed. For the application of the new system, the selection of appropriate parameters is necessary. In this study, selection of the applied track detectors and setting of the etching conditions have been carried out. Two different types of allyl diglycol carbonate (ADC or CR-39) track detectors were investigated, taking into account the detector’s background and response during the exposure (determination of calibration factor). The Baryotrak’s background track density (0–1.5 tracksmm–2) was lower than that of the 0.8–4 tracksmm–2. The response of the Tastrak was higher, but the deviation of the calibration factor was much higher (1.2–5.3 × 10–3 tracksmm–2/(Bqdaym–3)) than in the case of the Baryotrak (1.4–2.8 × 10–3 tracksmm–2/(Bqdaym–3)). After the systematic review of the etching system, a new method was developed. For the determination of the optimal track diameter, the argon fluoride (ArF) laser was applied to create tracks with diameters in the range of 10–100 µ. The optimum track size was in the range of 40–60 µ. On this basis, new etching conditions were determined: 6.25 M NaOH solution, a temperature of 90 degree centigrade, and time period of 8 hours.
    Źródło:
    Nukleonika; 2020, 65, 2; 133-137
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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