Occupational exposure to radon in different kinds of non-uranium mines
For more accurate assessments of the occupational exposure to radon for miners, the individual monitoring was conducted by using an improved passive integrating 222Rn monitor. A total of 120 miners in 3 different kinds of mines were monitored throughout a year. The results showed that the individual exposure to radon significantly varied with types of mines and work. Compared with the exposure to coal miners, the exposure to copper miners was much higher. Furthermore, it was found that the exposure might be overestimated if the environmental 222Rn monitored by the passive integrating monitors was used for assessment. The r...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Fan, D., Zhuo, W., Zhang, Y. Tags: Paper Source Type: research
A review of two methods used in the usa to assess he during fluoroscopic-based radiology
Dosemeter results for ~81 500 people performing fluoroscopic and interventional radiology procedures were examined to identify differences between groups monitored either by using two dosemeters, one placed at the collar above the apron and a second placed under the apron on the torso (EDE1) or by using one single dosemeter placed at the collar above the apron (EDE2). The median annual HE was 0.17 mSv for those monitored using the EDE1 protocol and 0.26 mSv for the group using the EDE2 protocol. The EDE2 method was used most frequently with the EDE1 method preferred for those more highly exposed. Approximately, 22 % of dos...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Yoder, R. C., Salasky, M. R. Tags: Paper Source Type: research
How do hospital sterilisation procedures affect the response of personal extremity rings and of eye lens tl dosemeters?
In this study, the effect of various sterilisation procedures has been tested on the dose response of extremity rings and of eye lens dosemeters in which thermoluminescent (TL) detectors (of types MTS-N and MCP-N, respectively) are used. The effects of medical sterilisation procedures were studied: by chemicals, by steam or by ultraviolet (UV), on the dose assessment by extremity rings and by eye lens dosemeters. Since it often happens that a dosemeter is accidentally machine-washed together with protective clothing, the effect of laundering on dose assessment by these dosemeters was also tested. The sterilisation by chemi...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Kopec, R., Bubak, A., Budzanowski, M., Sas-Bieniarz, A., Szumska, A. Tags: Paper Source Type: research
Eye lens doses in nuclear medicine: a multicentric study in belgium and poland
This study aimed to investigate the level of the eye lens (EL) doses in nuclear medicine in the light of the new International Commission on Radiological Protection limit. In 7 Belgian and 1 Polish hospitals, 45 staff members were monitored for EL (Hp(3)) and whole-body (WB) (Hp(10)) doses using dedicated dosemeters. Weekly measurements were carried out and used to estimate annual doses. Mostly diagnostic procedures involving radionuclides such as 99mTc and 18F were monitored; measurements were also performed for therapeutic procedures. The cumulative doses showed important variation across the participants. The weekly EL ...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Dabin, J., Kopec, R., Struelens, L., Szumska, A., Tomaszuk, M., Vanhavere, F. Tags: Paper Source Type: research
Hand dose evaluation of occupationally exposed staff in nuclear medicine
Manipulation of unsealed radiation sources in nuclear medicine (NM) departments involves non-uniform exposure to staff and high skin doses to the upper extremities from direct and scattered radiations. Conducted studies have shown that the annual dose limits could be exceeded and the continuous dose monitoring of NM worker's hands is needed. The aim of this article is to show results of hand dose monitoring in terms of operational quantity Hp(0.07) for occupationally exposed NM workers to beta and gamma radiations in the largest NM centre in Serbia. Dose assessment was done by means of thermoluminescent ring dosemeters DXT...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Kaljevic, J., Stankovic, K., Stankovic, J., Ciraj-Bjelac, O., Arandjic, D. Tags: Paper Source Type: research
Enhanced radioactive content of 'balance bracelets
During a routine whole body counting measurement of a worker at the Nuclear Research Center Negev, abnormal activities of 232Th and 238U were measured. After a thorough investigation, it was found that the radioactivity was due to a rubber bracelet (‘balance bracelet’) worn by the worker during the measurement. The bracelet was counted directly by an high pure germanium gamma spectrometry system, and the specific activities determined were 10.80 ± 1.37 Bq g–1 for 232Th and 5.68 ± 0.88 Bq g–1 for natural uranium. These values are obviously high compared with normally occurring radioacti...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Tsroya, S., Pelled, O., Abraham, A., Kravchik, T., German, U. Tags: Paper Source Type: research
Field correction factors for personal neutron dosemeters
A field-dependent correction factor can be obtained by comparing the readings of two albedo neutron dosemeters fixed in opposite directions on a polyethylene sphere to the H*(10) reading as determined with a thermal neutron detector in the centre of the same sphere. The work shows that the field calibration technique as used for albedo neutron dosemeters can be generalised for all kind of dosemeters, since H*(10) is a conservative estimate of the sum of the personal dose equivalents Hp(10) in two opposite directions. This result is drawn from reference values as determined by spectrometers within the EVIDOS project at work...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Luszik-Bhadra, M. Tags: Paper Source Type: research
Occupational dose assessment in interventional cardiology in serbia
The objective of this work is to assess the occupational dose in interventional cardiology in a large hospital in Belgrade, Serbia. A double-dosimetry method was applied for the estimation of whole-body dose, using thermoluminescent dosemeters, calibrated in terms of the personal dose equivalent Hp(10). Besides the double-dosimetry method, eye dose was also estimated by means of measuring ambient dose equivalent, H*(10), and doses per procedure were reported. Doses were assessed for 13 physicians, 6 nurses and 10 radiographers, for 2 consequent years. The maximum annual effective dose assessed was 4.3, 2.1 and 1.3 mSv for ...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Kaljevic, J., Ciraj-Bjelac, O., Stankovic, J., Arandjic, D., Bozovic, P., Antic, V. Tags: Paper Source Type: research
Radiation protection cabin for catheter-directed liver interventions: operator dose assessment
The number and complexity of interventional radiological procedures and in particular catheter-directed liver interventions have increased substantially. The current study investigates the reduction of personal doses when using a dedicated radiation protection cabin (RPC) for these procedures. Operator and assistant doses were assessed for 3 series of 20 chemoinfusion/chemoembolisation interventions, including an equal number of procedures with and without RPC. Whole body doses, finger doses and doses at the level of knees and eyes were evaluated with different types of TLD-100 Harshaw dosemeters. Dosemeters were also atta...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Maleux, G., Bergans, N., Bosmans, H., Bogaerts, R. Tags: Paper Source Type: research
Properties of the beosl dosimetry system in the framework of a large-scale personal monitoring service
The Individual Monitoring Service of the Helmholtz Zentrum München is currently using the BeOSL dosimetry system for monitoring ~15 000 persons per month. This dosimetry system has a modular structure and represents a complete new concept on handling dosemeters in a large-scale dosimetry service. It is based on optically stimulated luminescence dosemeters made of beryllium oxide. The dosimetric and operational properties of the system are shown and discussed. (Source: Radiation Protection Dosimetry)
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Haninger, T., Hödlmoser, H., Figel, M., König-Meier, D., Henniger, J., Sommer, M., Jahn, A., Ledtermann, G., Esser, R. Tags: Paper Source Type: research
A solution for neutron personal dosimetry in the absence of workplace spectrometry
In view of the widely varying energy spectra encountered in practical situations, accuracy of neutron dose assessment requires detailed knowledge of detector responses and workplace conditions to achieve an adequate level of protection. If the neutron spectrum should be a priori unknown and no measurement of the workplace spectrum is available, the ‘Compendium of Neutron Spectra and Detector Responses for Radiation Protection Purposes’ published in the International Atomic Energy Agency Technical Report Series offers a broad range of reference spectra that may be appropriate for many applications. The proposed ...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Hajek, M., Cruz Suarez, R. Tags: Paper Source Type: research
Dose measurements in the stray field of a ge optima ct660
Statistics show how important computed tomography (CT) dosimetry has become. In order to estimate the dose distribution in the CT scan room during an examination, measurements of the ambient dose equivalent H*(10) have been performed. The primary aim of this study is the radiation protection of the staff and not the determination of the dose to the patient or in the primary beam. Therefore, the dose outside the primary beam, i.e. in the scattered field of the Physikalisch-Technische Bundesanstalt's GE Optima CT660, is of importance. The results of the dose measurements are analysed in dependence on the settings of the X-ra...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Zutz, H., Alikhani, B. Tags: Paper Source Type: research
Assessment of eye lens doses in interventional radiology: a simulation in laboratory conditions
The objective of the authors’ experiment was to investigate the relations between eye lens dose and Hp(10), Hp(3) or Hp(0.07) values measured with a conventional whole-body personal thermoluminescence dosemeter (TLD). Conditions of occupational exposure during common interventional procedures were simulated in laboratory. An anthropomorphic phantom represented a physician. The TLDs were fixed to the phantom in different locations that are common for purposes of personal dosimetry. In order to monitor the dose at the eye lens level during the exposures, a special thermoluminescence eye dosemeter was fixed to the phant...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Cemusova, Z., Ekendahl, D., Judas, L. Tags: Paper Source Type: research
Application of an imaging plate for evaluating the uncertainty in direct organ measurements due to variation in detector location
In this study, the proposed method was tested in an experiment using a realistic torso phantom containing an 241Am liver source. The latent image of this source was obtained by irradiating the IP (20 x 40 cm2) from the anterior surface of the phantom. A comparison of responses between the IP and a high-purity germanium detector was made for 6 of the 144 circular ROIs arranged on the latent image, showing excellent correlation between the two sets of measures. The dispersion of the photostimulated luminescence values of the 144 ROIs was found to be 8.2% (1) and 1.09 as a log-normal scattering factor, which was exp...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Kurihara, O., Kanai, K., Hirota, M., Kim, E., Tani, K., Takada, C., Momose, T. Tags: Paper Source Type: research
Silicon diode as an alpha particle detector and spectrometer for direct field measurements
A windowless silicon (Si) diode (4 mm2) was evaluated as alpha particle detector and spectrometer for field measurements. It was irradiated with alpha particles from a 241Am (2.3 kBq) and a 210Po (9 kBq) source at source–detector distances (SDD) of 0.5, 1.0 and 1.8 cm. The energy resolution in terms of full width at half maximum was 281, 148 and 113 keV for SDD of 0.5, 1.0 and 1.8 cm, respectively. The minimum detectable activity increased from 0.08 to 0.83 Bq when the SDD increased from 0.5 to 1.8 cm. The detector has the potential for several alpha spectrometric applications, such as monitoring for wound, skin and ...
Source: Radiation Protection Dosimetry - September 7, 2016 Category: Radiology Authors: Ören, U., Nilsson, J., Herrnsdorf, L., Rääf, C. L., Mattsson, S. Tags: paper Source Type: research
