Estimation of effective dose and radiation risk in pediatric barium studies procedures

2018 ◽  
Vol 138 ◽  
pp. 40-44 ◽  
Author(s):  
A. Sulieman ◽  
B. Elhag ◽  
M. Alkhorayef ◽  
E. Babikir ◽  
K. Theodorou ◽  
...  
Keyword(s):  
Effective Dose ◽  
Radiation Risk ◽  
Barium Studies

DETERMINATION OF THE TOTAL EFFECTIVE DOSE OF EXTERNAL AND INTERNAL EXPOSURE BY DIFFERENT IONIZING RADIATION SOURCES

2019 ◽  
Vol 187 (1) ◽  
pp. 129-137
Author(s):  
V A Kudryashev ◽  
D S Kim
Keyword(s):  
Ionizing Radiation ◽  
Effective Dose ◽  
Radiation Risk ◽  
Neutron Radiation ◽  
Radiation Shielding ◽  
The Body ◽  
Internal Exposure ◽  
Complex Method ◽  
Radiation Sources ◽  
Total Effective Dose

Abstract The purpose of the research is to develop an integrated technique for determining the effective dose (E) of external and internal exposure by different sources of ionizing radiation. The proposing technique for determining the total effective dose is based on three methods of calculation. The first one is multiplying the value of the individual dose equivalent $H_{p}(10)$ by the factor of 0.642 to account for radiation shielding by various organs and tissues and its backscattering. The second method is multiplying $H_{p}(10)$ by the conversion factor of air kerma in free air in a plate phantom, depending on the photon energy. The third method is multiplying $H_{p}(10)$ by the sum of the radiosensitivity coefficients of various organs and tissues. As a result of research, a complex method was developed for determining the total effective dose, composed of doses of cosmic radiation, external gamma-, beta- and neutron radiation, internal exposure from radionuclides, including CDP of radon and thoron, entering the body through the organs of digestion and respiration. The proposed technique for determining the total effective dose allows one to take into account the comprehensive effect of ionizing radiation sources on a person and to obtain a more accurate measure of radiation risk than the existing methods provide.

scholarly journals Assessment of Radiation Risk on Healthcare Workers and Public in & around Two Largest Hospital Campuses of Bangladesh

2021 ◽  
pp. 48-57
Keyword(s):  
Public Health ◽  
Effective Dose ◽  
Healthcare Workers ◽  
Radiation Risk ◽  
Radiation Monitoring ◽  
Radiation Hazard ◽  
Lifetime Cancer Risk ◽  
The Public ◽  
Continuous Radiation ◽  
Yearly Effective Dose

Ionizing radiation gives tremendous benefit to mankind in the hospital through diagnosis and treatment to patients but unnecessary radiation may cause harm to healthcare workers & the public. The purpose of the study is to continuous radiation monitoring in & around the three largest radiological facilities of Bangladesh such as Atomic Energy Centre Dhaka (AECD), Dhaka Medical College Hospital (DMCH) & Bangabandhu Sheikh Mujib Medical University (BSMMU) campuses, and estimation of radiation risk on healthcare workers & public health. Continuous radiation monitoring was performed in & around the AECD, DMCH, BSMMU campuses from August-October 2020 using the Chemiluminescent Dosimeters. The yearly effective doses to healthcare workers and the public due to radiation released from the facilities were ranged from 0.606 ± 0.031 mSv to 0.801 ± 0.0.042 mSv with a mean of 0.707 ± 0.053 mSv. The excess lifetime cancer risk (ELCR) on healthcare workers & public health were evaluated based on the yearly effective dose and ranged from 2.486 Χ 10-3 to 3.287 Χ 10-3 with a mean of 2.900 Χ 10-3. The average yearly effective dose and ELCR on healthcare workers & public health were lower than those of the worldwide permissible values. Continuous radiation monitoring in & around the largest radiological facilities is required for detection of the radiation generating equipment’s malfunctions and improper handling of the radioactive materials. The study would help for minimization of radiation risk on healthcare workers & the public and this keeps the hospital’s environment free from radiation hazard.

Forecast of Radiation Risks of the Population in the Contaminated 137Cs Territories of Russia, in Accordance with Current ICRP Recommendations

2020 ◽  
Vol 65 (3) ◽  
pp. 45-52
Author(s):  
A. Menyajlo ◽  
V. Kashcheev ◽  
E. Pryakhin ◽  
M. Maksyutov ◽  
K. Tumanov ◽  
...  
Keyword(s):  
Effective Dose ◽  
Environmental Protection Agency ◽  
Radiation Risk ◽  
Risk Groups ◽  
Individual Risk ◽  
Maximum Increase ◽  
Population Groups ◽  
Health Authorities ◽  
The Us ◽  
The Individual

Purpose: Calculations of radiation detriment to the population currently living (in 2020) in the territories of Russia contaminated with 137Cs after the Chernobyl accident in 1986. Material and methods: Radiation detriment was calculated in two ways: according to the original ICRP method, and approximate calculation as the product of the nominal risk factor of RSS-99/2009 by the effective dose (nominal radiation detriment). For ICRP calculations, equivalent doses were estimated using the dose coefficients of the US Environmental Protection Agency (EPA). The number of the studied population at the beginning of 2020 was 142676 people, 65205 men and 77471 women. This is mainly the population of the Bryansk region and Tula region, 85.5 % and 10 % of the total population, respectively. The average accumulated effective dose of the population was 30.6 mSv, and the maximum individual accumulated dose was 707 mSv. Results: In 2020, for men at the age of 44 and for women at the age of 55, the nominal radiation detriment is approximately equal to the value of radiation detriment calculated using the ICRP method. At the same time, the nominal detriment is significantly (up to 2.3 times) underestimated for younger and overestimated for older ages. In 2020, the critical population groups with the highest accumulated doses and maximum radiation detriment are men aged 34 and women aged 35. For these population groups, the average accumulated effective doses were 35.3 mSv and 39.2 mSv, and the average radiation detriment was 2.6×10–3 and 4.2×10–3, for men and women, respectively. For 11.8 % of the population (8.3 % of men and 14.8 % of women), the individual radiation detriment calculated using the ICRP method exceeds the value of 3.5×10–3, which corresponds to the maximum increase in individual risk for the population over 70 years of exposure, established by RSS-99/2009 for normal exposure conditions. The maximum radiation detriment of 3.9×10–2 was found for a woman of the Krasnogorsky district of the Bryansk region at the age of 37 years, with an accumulated effective dose of 392 mSv. Conclusion: The results of this work can be used in preparing recommendations to health authorities on improving medical supervision of exposured citizens living in areas contaminated with radionuclides, as well as in developing regulatory documents for the provision of targeted medical care to people from high radiation risk groups using personalized medicine methods.

scholarly journals Radiation Exposure in Patients with Isolated Limb Trauma: Acceptable or Are We Imaging Too Much?

2020 ◽  
Vol 9 (11) ◽  
pp. 3609
Author(s):  
James A. Wheeler ◽  
Natasha Weaver ◽  
Zsolt J. Balogh ◽  
Herwig Drobetz ◽  
Andrew Kovendy ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Effective Dose ◽  
Radiation Risk ◽  
Plain Film ◽  
Study Cohort ◽  
X Ray ◽  
Cumulative Effective Dose ◽  
Orthopaedic Patients ◽  
Extremity Trauma ◽  
The Mean

The aim of our study was to investigate the cumulative effective dose of radiation resulting from medical imaging in orthopaedic patients with isolated extremity trauma. Deidentified radiology records of consecutive patients without age restriction with isolated extremity trauma requiring operative treatment at a regional hospital were reviewed retrospectively over a 1-year period, and the effective dose per patient for each study type of plain film X-ray, computed tomography, and operative fluoroscopy was used to calculate cumulative effective dose. Values were summarised as mean, ± standard deviation, maximum, and proportion with overdose (>20 mSv). The study cohort included 428 patients (193 male and 235 female) with an average age of 44 years (±28). There were 447 procedures performed, i.e., all involved operative fluoroscopy, 116 involved computed tomography, and 397 involved X-ray. The mean cumulative effective dose per patient was 1.96 mSv (±4.98, 45.12). The mean cumulative effective dose for operative fluoroscopy was 0.32 mSv (±0.73, 5.91), for X-ray was 1.12 mSv (±3.6, 39.23) and for computed tomography was 2.22 mSv (±4.13, 20.14). The mean cumulative effective dose of 1.96 mSv falls below the recommended maximum annual exposure of 20 mSv. This study can serve as a guide for informing clinicians and patients of the acceptable radiation risk in the context of isolated extremity trauma.

scholarly journals CRITERIA FOR THE PROTECTING OF POPULATION AFTER RADIATION ACCIDENT: USE OF RADIATION RISK FOR ANALYSIS AND OPTIMAL DECISIONS MAKING TO LIMIT THE CONSUMPTION OF FOOD CONTAMINATED BY TECHNOGENIC RADIONUCLIDES

2018 ◽  
Vol 11 (4) ◽  
pp. 28-38
Author(s):  
V. S. Repin ◽  
L. V. Repin
Keyword(s):  
Effective Dose ◽  
Radiation Protection ◽  
Specific Activity ◽  
Radiation Risk ◽  
Age Groups ◽  
Weighted Average ◽  
Malignant Neoplasms ◽  
First Year ◽  
Age Group ◽  
Risk Of Death

The purpose of this paper is to assess the compliance of criterion A, adopted in NRB-99/2009 as emergency level of dose intervention, to permissible values of specific activity of137Cs,90Sr and131I in food products in the first year after the accident. Assessments are made on the basis of comparison of the conservativeness coefficients by dose and the magnitude of the risk. The results of the evaluation showed that estimates of the doses and risks for137Cs,90Sr, calculated on the basis of weighting by the number of age groups, are equally conservative. For131I, the conservative factors for dose and risk vary significantly, which indicates that it is not appropriate to use an effective dose to optimization of radiation protection for the given radionuclide. The ratios of the risk-weighted average weighted by the number of individual age groups to the weighted average effective dose values for137Cs and90Sr are close to the nominal risk of death from malignant neoplasms for the population of 5×10-5, which confirms that nominal risk factors can only be used for the general population. Two variants of the criteria for optimization of the radiation protection of the population are proposed: 1) by the value of the average weighted by the number of individual age groups, the value of the effective dose, or 2) the value of the average weighted by the number of individual age groups of risk. It is shown that to optimize the protection of individual age groups, the more preferable criterion is the risk value calculated for a given age group, since the maximum effective dose of some age group does not always correspond to the maximum risk.

scholarly journals Evaluation of radiation risk for patients undergoing medical examinations in the Russian Federation

2021 ◽  
Vol 14 (3) ◽  
pp. 56-68
Author(s):  
V. Yu. Golikov ◽  
A. V. Vodovatov ◽  
L. A. Chipiga ◽  
I. G. Shatsky
Keyword(s):  
Risk Assessment ◽  
Effective Dose ◽  
Russian Federation ◽  
Gold Standard ◽  
Radiation Risk ◽  
The Body ◽  
Russian Population ◽  
Organ Doses ◽  
The Russian Federation ◽  
Medical Examinations

The aim of the study was to develop a methodology for assessing radiation risk for patients undergoing medical examinations in the Russian Federation. The methodology is based on the risk model of the ICRP Publication 103, the coefficients of lifetime radiation risk for the Russian population and the results of evaluating the doses of patients in the Russian Federation. For thirty examinations that define about 80% of the collective dose of the population of the Russian Federation from medical exposure, the radiation risk was calculated using «gold standard», — the organ doses and the corresponding sex/age risk coefficients for the Russian population. For other examinations (with the exception of mammography) the values of the risk coefficients normalized on 1 mSv of effective dose, which is the averaged value for four selected anatomical areas of the body: head, neck, chest and abdominal cavity — pelvis, were used. It is assumed that for such examinations the error of risk assessment will increase relative to the error of risk assessment for the aforementioned 30 examinations not more than 30%. It is shown that risk estimates for some examinations calculated using the “gold standard” may differ from such estimates on the base of effective dose and nominal risk coefficients averaged by age and the sex to the order of magnitude. 

Sistem Pemantauan Dosis (Dose Monitoring System) Dalam Upaya Meningkatkan Kualitas Pelayanan Radiologi Diagnostik dan Intervensional

2021 ◽  
Author(s):  
Tuti Amalia ◽  
Keyword(s):  
Computed Tomography ◽  
Interventional Radiology ◽  
Effective Dose ◽  
Monitoring System ◽  
Interventional Procedures ◽  
Interventional Procedure ◽  
Radiation Risk ◽  
Imaging Modalities ◽  
Dose Monitoring ◽  
Patient Doses

X-ray-based medical imaging has become one of the most popular imaging modalities today. Computed tomography (CT) and interventional procedures can result in higher radiation exposure for patients compared to other radiographic examinations. There has been an increase in the effective dose of > 100 mSv from some procedures. Recent studies have shown that multiphase CT imaging and repeated imaging provide larger radiation doses in some patients. In considering the effective dose (E) for each patient, it is essential to note that the risk per Sv tends to be greater on average in pediatric patients than in adults. In addition, E can be used to describe the possible risk to the patient. Dose management is essential in monitoring and controlling patient doses. Consistent and systematic monitoring of radiation dose is needed to improve the quality of diagnostic and interventional radiology services. Dose monitoring activities include performance control, optimization of protocols used, corrective actions against non-standard practices, and raising awareness for radiation workers to minimize risks. The use of a dose monitoring system (Dose Monitoring System) responds to concerns about the radiation risk that comes from diagnostic imaging modalities, particularly Computed Tomography (CT) and fluoroscopy in interventional procedures. The dose monitoring system (Dose Monitoring System) has developed into a requirement in monitoring and controlling patient doses and is one of the applications of radiation safety culture that can improve diagnostic and interventional radiology services. Keywords: Computed tomography (CT), effective dose, interventional procedure

Radiation exposure of patients undergoing whole-body FDG-PET/CT examinations

2014 ◽  
Vol 53 (05) ◽  
pp. 217-220 ◽  
Author(s):  
D. Noßke ◽  
U. Leche ◽  
G. Brix
Keyword(s):  
Radiation Exposure ◽  
Effective Dose ◽  
Fdg Pet ◽  
Radiation Risk ◽  
Whole Body ◽  
Organ Doses ◽  
Weighting Factors ◽  
Pet Ct ◽  
Conversion Coefficients ◽  
Fdg Pet Ct

SummaryAim: Reinvestigation of the radiation exposure of patients undergoing whole-body [18F]FDG-PET/CT examinations pursuant to the revised recommendations of the ICRP. Methods: Conversion coefficients for equivalent organ doses were determined for realistic anthropomorphic phantoms of reference persons. Based on these data, conversion coefficients for the effective dose were calculated using the revised tissue-weighting factors that account for the different radiation susceptibilities of organs and tissues, and the redefinition of the group ‘remainder tissues’. Results: Despite the markedly changed values of the equivalent organ doses estimated for FDG and of the tissue-weighting factors, the conversion coefficient for the effective dose resulting from FDG administration decreases only slightly by 10 %. For whole-body CT scans it remains even unchanged. Conclusion: The updated dose coefficients provide a valuable tool to easily assess the generic radiation risk of patients undergoing whole- body PET/CT (or PET/MRI) examinations and can be used, amongst others, for protocol optimization.

scholarly journals A Study of Natural Radioactivity Levels and Radon/Thoron Release Potential of Bedrock and Soil in Southeastern Ireland

2021 ◽  
Vol 18 (5) ◽  
pp. 2709
Author(s):  
Mirsina Mousavi Aghdam ◽  
Quentin Crowley ◽  
Carlos Rocha ◽  
Valentina Dentoni ◽  
Stefania Da Pelo ◽  
...  
Keyword(s):  
Effective Dose ◽  
Natural Radioactivity ◽  
Soil Type ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Radiation Risk ◽  
Sediment Geochemistry ◽  
Distribution Maps ◽  
Radiometric Data ◽  
Radioactivity Levels

Radon (222Rn) and thoron (220Rn) account for almost two-thirds of the annual average radiation dose received by the Irish population. A detailed study of natural radioactivity levels and radon and thoron exhalation rates was carried out in a legislatively designated “high radon” area, as based on existing indoor radon measurements. Indoor radon concentrations, airborne radiometric data and stream sediment geochemistry were collated, and a set of soil samples were taken from the study area. The exhalation rates of radon (E222Rn) and thoron (E220Rn) for collected samples were determined in the laboratory. The resultant data were classified based on geological and soil type parameters. Geological boundaries were found to be robust classifiers for radon exhalation rates and radon-related variables, whilst soil type classification better differentiates thoron exhalation rates and correlated variables. Linear models were developed to predict the radon and thoron exhalation rates of the study area. Distribution maps of radon and thoron exhalation rates (range: E222Rn [0.15–1.84] and E220Rn [475–3029] Bq m−2 h−1) and annual effective dose (with a mean value of 0.84 mSv y−1) are presented. For some parts of the study area, the calculated annual effective dose exceeds the recommended level of 1 mSv y−1, illustrating a significant radiation risk. Airborne radiometric data were found to be a powerful and fast tool for the prediction of geogenic radon and thoron risk. This robust method can be used for other areas where airborne radiometric data are available.

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