gamma dosimeter Articles

  • Calibration and characterisation of extremity dosimeters

    The increasing use of radiation in the medical field is providing great advances in health improvement. However, these techniques can generate an increase in the number of professionals exposed to radiation. The Brazilian authorities (Brazilian Nuclear Energy Commission ? CNEN) have imposed the monitoring of specific body parts of professionals. One of these obligations is the monitoring of the ...


    By Inderscience Publishers

  • Performance of some handheld dosimeters used for gamma–ray ambient dose rate measurements

    A study was carried out on the performance of some handheld dosimeters that are used for measuring ambient gamma dose rates. A CsI scintillation–based and two GM–based dosimeters were used to measure the absorbed dose rates in an indoor environment, inside a lead shield, on different floors of a building, in a desert environment and in a boat on the Arabian Gulf. The study showed that while some ...


    By Inderscience Publishers

  • Experimental determination of dose uniformity in the CDTN gamma irradiator

    This paper describes an experimental study of dose uniformity within a container used for products irradiation, in the gamma irradiation facility at Nuclear Technology Development Center (CDTN). The CDTN is a research institute of the National Nuclear Energy Commission (CNEN), Brazil. Polymethylmethacrylate (PMMA) dosimeters were used in order to determine the Dose Uniformity Ratio (DUR) inside ...


    By Inderscience Publishers

  • Assessment of the environmental outdoor gamma radiation levels in Sao Paulo City

    Dose values from natural radiation sources in several sites of Sao Paulo City were assessed from environmental outdoor gamma radiation levels, by using CaSO-4:Dy thermoluminescent dosimeters. Twelve monitoring stations were placed in different regions of the town including both urban and outskirts areas and the measurements were carried out quarterly and ...


    By Inderscience Publishers

  • Study of the effect of post-irradiation with low linear energy transfer on optical and spectral response of CR-39 polymeric material

    The optical properties of CR-39 polymer track detectors irradiated with high Linear Energy Transfer (LET) (alpha particles at energies 3.05 MeV and 4.86 MeV) and followed by low LET (gamma ray irradiation at different doses ranging from 0 to 200 kGy) were investigated. The chemical etching was verified for all samples. Also, the optical properties were studied with an Ultraviolet-Visible (UV-VIS) ...


    By Inderscience Publishers

  • Natural radiation level in the environment of Tehri Garhwal, Uttaranchal

    The natural radiation levels were measured in about 50 residential houses of Tehri Garhwal, Uttaranchal, using an environmental radiation dosimeter in both the indoor and the outdoor atmosphere. The total gamma ray activity was found to vary from 29.74 µR/h to 41.19 µR/h with a mean of 36.5 µR/h for the indoor environment, whereas for outdoors it varied from 28.76 µR/h to 43.46 µR/h with a mean ...


    By Inderscience Publishers

  • Development and production of holders for extremity detectors

    The objective of this paper was to develop and produce holders for thermoluminescent detectors for use in interventionist radiology and nuclear medicine. To obtain the value of Dose Equivalent for Extremities, a dosimetry of extremities was done. The holders must have characteristics which are adequate for their intended use. The detector element used in the holders was the LiF:Mg,Ti (TLD-100) ...


    By Inderscience Publishers

  • Physical dosimetry system in radiation accidents

    We experience various types of radiation accidents. When a radiation accident happens, one of the important aspects that we have to consider is the radiation dose to the victims of the accident. To judge the health effects due to radiation exposure, it is necessary to make a dose assessment. There is a variety of dose assessment methods, of two types: biological dosimetry and physical dosimetry. ...


    By Inderscience Publishers

  • Study of the effect of post-irradiation with low linear energy transfer on optical and spectral response of CR-39 polymeric material

    The optical properties of CR-39 polymer track detectors irradiated with high Linear Energy Transfer (LET) (alpha particles at energies 3.05 MeV and 4.86 MeV) and followed by low LET (gamma ray irradiation at different doses ranging from 0 to 200 kGy) were investigated. The chemical etching was verified for all samples. Also, the optical properties were studied with an Ultraviolet-Visible (UV-VIS) ...


    By Inderscience Publishers

  • Low-dose monitoring for occupational exposure and the influence of measurement accuracy

    This paper presents the evolution of individual radiation doses received by occupationally exposed workers. The individual doses accumulated over the period 2000-2007 correlated to nuclear laboratory and radiation source (gamma, X-rays) types are in the low radiation range. Dose equivalent Hp(10) was measured by a film dosimeter system; the influence of the measurement accuracy on the results was ...


    By Inderscience Publishers

  • Measurement uncertainty

    The IAEA/WHO Network, through Secondary Standards Dosimetry Laboratories (SSDLs) designated by the Member States, provides a direct linkage of national dosimetry standards to the international measurement system (SI, for Système International). Through the proper calibration of field instruments by the SSDLs, these measurements are traceable to the Primary Standards Dosimetry Laboratories (PSDLs) ...

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