SECONDARY STANDARD CALIBRATION, MEASUREMENT AND IRRADIATION CAPABILITIES OF THE INDIVIDUAL MONITORING SERVICE AT THE HELMHOLTZ ZENTRUM MÜNCHEN: ASPECTS OF UNCERTAINTY AND AUTOMATION
This article provides an example for their practical implementation in the Munich IAEA/WHO secondary standard dosimetry laboratory. It focusses on two aspects: automation issues and uncertainties in calibration. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Greiter, M. B., Denk, J., Hoedlmoser, H. Tags: Paper Source Type: research
A survey on the accuracy of whole-body counters operated in fukushima after the nuclear disaster
To check internal contamination, whole-body counters (WBCs) have been used continuously in Fukushima prefecture since the 2011 disaster. Many WBCs have been installed recently. The accuracy of these WBCs has been tested with bottle manikin absorption phantoms. No significant problems with the performance or accuracy of the WBCs have been found. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Nakano, T., Kim, E., Tani, K., Kurihara, O., Sakai, K. Tags: Paper Source Type: research
A practical approach to perform the isotropy test for extremity dosemeters
This article proposes and validates a practical approach to reduce the number of irradiations. Results show that wrist and ring dosemeters in this study meet the ISO 12794 requirements for the isotropy test. However, additional studies would be needed to verify the newer IEC 62387 Standard. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Gultresa, J., Llansana, J., Roig, M., Ginjaume, M. Tags: Paper Source Type: research
Eurados programme of intercomparisons for individual monitoring services: seven years of development and future plans
In 2008 the European Radiation Dosimetry Group (EURADOS) started a new programme of intercomparisons for individual monitoring services (IMS). The aim was to provide the possibility to IMS in Europe to participate in dosimetry intercomparions with regular time intervals with all types of dosemeter systems that are used routinely to monitor workers for exposure to external radiation. A self-evaluation of the programme shows that, apart from a few problems encountered, the programme can be judged as fit for its purpose. The results of a questionnaire among the participants support this conclusion. The conclusions encourage E...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Grimbergen, T., Figel, M., McWhan, A., Romero, A. M., Stadtmann, H. Tags: Paper Source Type: research
The results of the eurados intercomparison ic2014 for whole-body dosemeters in photon fields
The European Dosimetry Group (EURADOS) first started performing international intercomparisons for whole-body dosemeters for individual monitoring services in 1998. Since 2008, these whole-body intercomparisons have been performed on a regular basis. In this latest intercomparison (IC2014), 96 monitoring services from 35 countries (mostly European) participated with 112 dosimetry systems. Unlike in the previous intercomparisons, the whole registration, communication and data exchange process was handled by a new on-line platform. All dosemeter irradiations were carried out in the Seibersdorf accredited dosimetry laboratory...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Stadtmann, H., Grimbergen, T. W. M., Figel, M., Romero, A. M., McWhan, A. F., Gärtner, C. Tags: Paper Source Type: research
Eurados intercomparisons in external radiation dosimetry: similarities and differences among exercises for whole-body photon, whole-body neutron, extremity, eye-lens and passive area dosemeters
The European Radiation Dosimetry Group (EURADOS) has been organising dosimetry intercomparisons for many years in response to an identified requirement from individual monitoring services (IMS) for independent performance tests for dosimetry systems. The participation in intercomparisons gives IMS the opportunity to show compliance with their own quality management system, compare results with other participants and develop plans for improving their dosimetry systems. In response to growing demand, EURADOS has increased the number of intercomparisons for external radiation dosimetry. Most of these fit into the programme of...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Romero, A. M., Grimbergen, T., McWhan, A., Stadtmann, H., Fantuzzi, E., Clairand, I., Neumaier, S., Figel, M., Dombrowski, H. Tags: Paper Source Type: research
Eurados ic2012n: further information derived from an eurados international comparison of neutron personal dosemeters
In 2012, the European Radiation Dosimetry Group (EURADOS) performed an intercomparison for neutron dosemeters that are intended to measure personal dose equivalent, Hp(10). A total of 31 participants registered with 34 dosimetry systems. The irradiation tests were chosen to provide the participants with useful information on their dosimetry systems, i.e. linearity, reproducibility, responses for different energies and angles and to simulated workplace fields. This paper gives details of the extensive information derived from the exercise. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Chevallier, M.- A., Fantuzzi, E., Cruz-Suarez, R., Luszik-Bhadra, M., Mayer, S., Thomas, D. J., Tanner, R., Vanhavere, F. Tags: Paper Source Type: research
Uncertainty evaluation for multidetector passive dosemeters using a two-stage measurement model and the monte carlo method
This paper proposes a method for evaluating the standard uncertainty in the measurements with passive personal dosemeters using a numerical method (Monte Carlo). The paper builds on a previous paper where a two-stage measurement model for passive dosemeters was proposed. This model follows the course of events during the measurement, which also consists of two stages: (1) the exposure of the dosemeter in the workplace where a signal develops in the form of, e.g. electron/hole pairs in solid-state detectors and film or damages to a molecular structure in track films, the latent signal and (2) the evaluation at the service w...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: van Dijk, J. W. E. Tags: Paper Source Type: research
Ciemat external dosimetry service: iso/iec 17025 accreditation and 3 y of operational experience as an accredited laboratory
In 2008, the CIEMAT Radiation Dosimetry Service decided to implement a quality management system, in accordance with established requirements, in order to achieve ISO/IEC 17025 accreditation. Although the Service comprises the approved individual monitoring services of both external and internal radiation, this paper is specific to the actions taken by the External Dosimetry Service, including personal and environmental dosimetry laboratories, to gain accreditation and the reflections of 3 y of operational experience as an accredited laboratory. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Romero, A. M., Rodriguez, R., Lopez, J. L., Martin, R., Benavente, J. F. Tags: Paper Source Type: research
Iaea intercomparison exercises of thyroid measurement: performance of latin american and caribbean laboratories
131I is widely used in Latin America and Caribbean Region in the field of nuclear medicine and has been recognised as one of the main sources of potential intake of radionuclides by the staff. The In Vivo Monitoring laboratory of the Institute for Radiation Protection and Dosimetry (IRD-CNEN-Brazil) organised three intercomparison exercises (2005, 2009 and 2013) in the scope of IAEA technical cooperation projects RLA9049 and RLA9066 aimed to disseminate and harmonise the technique for measuring 131I in the human thyroid. The number of participants in Latin America increased from 9 to 20 institutions from 7 and 13 countries...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Dantas, B. M., Dantas, A. L. A., Cruz-Suarez, R. Tags: Paper Source Type: research
Development of simulated workplace fields at kriss for performance test of neutron personal dosemeters
Simulated workplace neutron fields have been developed at the Korea Research Institute of Standards and Science (KRISS). An 241Am–Be neutron source and a cylindrical moderator composed of stainless steel and heavy water were installed in a 10-cm-thick concrete block with dimensions of 150 x 120 x 120 cm3. The neutron energy spectrum at a distance of 66.5 cm was measured using a Bonner sphere spectrometer and was found to agree with the spectrum obtained from the Monte Carlo N-Particle Extended simulation to within 5 %. The neutron fluence-to-personal dose equivalent conversion coefficients were (20.8–43.6) pSv&...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Kim, J., Park, H., Kim, Y. Tags: Paper Source Type: research
An interlaboratory comparison on the determination of 241am, 244cm and 252cf in urine
An intercomparison exercise on the determination of 241Am, 244Cm and 252Cf in urine was performed. Since it was designed with regard to emergency preparedness, the detection limit for each nuclide was set to 0.1 Bq per 24-h urine sample. Most of the participating laboratories were established bioassay laboratories. However, some laboratories that routinely determine 241Am only in environmental samples were also invited in order to explore their potential for emergency bioassay analysis. Another aspect of the intercomparison was to investigate the performance of all laboratories concerning the chemical yields of the 243Am t...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Gerstmann, U. C., Taubner, K., Hartmann, M. Tags: Paper Source Type: research
Practical metrological aspects of neutron personal dosimetry
This article addresses practical issues as being faced in the process of testing, verification and calibration of passive and active personal neutron dosemeters. Namely, a limited choice of neutron sources and geometric limitations occurring when ISO water phantom is used. The requirements of international standards for personal neutron dosemeters and the possibilities to fulfil them are discussed briefly. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Kralik, M., Vykydal, Z. Tags: Paper Source Type: research
Second latin american intercomparison on internal dose assessment
Internal dosimetry intercomparisons are essential for the verification of applied models and the consistency of results'. To that aim, the First Regional Intercomparison was organised in 2005, and that results led to the Second Regional Intercomparison Exercise in 2013, which was organised in the frame of the RLA 9/066 and coordinated by Autoridad Regulatoria Nuclear of Argentina. Four simulated cases covering intakes of 131I, 137Cs and Tritium were proposed. Ninteen centres from thirteen different countries participated in this exercise. This paper analyses the participants' results in this second exercise in order to tes...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Rojo, A., Puerta, N., Gossio, S., Gomez Parada, I., Cruz Suarez, R., Lopez, E., Medina, C., Lastra Boylan, J., Pinheiro Ramos, M., Mora Ramirez, E., Alves dos Reis, A., Yanez, H., Rubio, J., Vironneau Janicek, L., Somarriba Vanegas, F., Puerta Ortiz, J., Tags: Paper Source Type: research
AIR KERMA TO Hp(3) CONVERSION COEFFICIENTS FOR IEC 61267 RQR X-RAY RADIATION QUALITIES: APPLICATION TO DOSE MONITORING OF THE LENS OF THE EYE IN MEDICAL DIAGNOSTICS
Recent studies highlight the fact that the new eye lens dose limit can be exceeded in interventional radiology procedures and that eye lens monitoring could be required for these workers. The recommended operational quantity for monitoring of eye lens exposure is the personal dose equivalent at 3 mm depth Hp(3) (ICRU 51). However, there are no available conversion coefficients in international standards, while in the literature coefficients have only been calculated for monoenergetic beams and for ISO 4037-1 X-ray qualities. The aim of this article is to provide air kerma to Hp(3) conversion coefficients for a cylindrical ...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Principi, S., Guardiola, C., Duch, M. A., Ginjaume, M. Tags: Paper Source Type: research
