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    A CASE STUDY ON THE USE OF SEASONAL CORRECTION FACTORS FOR INDOOR RADON MEASUREMENTS
    (Oxford Univ Press, 2019) Algin, E.; Asici, C.; Sogukpinar, H.; Akkurt, N.
    Radon concentration measurements were performed in the city Eskisehir, Turkey in order to quantify seasonal variation. Using the assumption that indoor radon concentrations exhibit annual cyclic behavior, Pinels methodology was employed to obtain seasonal correction factors (SCFs). A total of 142 dwellings had radon concentration data for each season that enabled to obtain annual average radon concentrations. Estimated SCFs were applied to each of the 142 dwellings to assess the validity of the factors. The results demonstrate that even in a very small region significant variation in radon concentrations of different dwellings can be observed, and that a good care should be taken in applying SCFs to a short-term radon measurement to obtain average annual radon concentration.
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    Öğe
    Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes
    (Elsevier, 2021) Guttormsen, M.; Alhassid, Y.; Ryssens, W.; Ay, K. O.; Ozgur, M.; Algin, E.; Larsen, A. C.
    Understanding the evolution of level densities in the crossover from spherical to well-deformed nuclei has been a long-standing problem in nuclear physics. We measure nuclear level densities for a chain of neodymium isotopes Nd-142,Nd-144-151 which exhibit such a crossover. These results represent the most complete data set of nuclear level densities to date for an isotopic chain between neutron shell-closure and towards mid-shell. We observe a strong increase of the level densities along the chain with an overall increase by a factor of approximate to 150at an excitation energy of 6 MeV and saturation around mass 150. Level densities calculated by the shell model Monte Carlo (SMMC) are in excellent agreement with these experimental results. Based on our experimental and theoretical findings, we offer an explanation of the observed mass dependence of the level densities in terms of the intrinsic single-particle level density and the collective enhancement. (C) 2021 The Author(s). Published by Elsevier B.V.