Use of RESRAD-Onsite 7.2 Code to Assess Environmental Risk around Tudor Shaft Mine Tailing Sites

The RESRAD-onsite 7.2 code has been used to assess the total dose rate in Tudor shaft site contaminated over an area of 10 km2. The risk analysis simulation was span over a period of 1.0E+3 years. The maximum total dose of 1.64 mSv/yr was obtain at t = 8.17 ± 0.02 years. The total peak dose at time t = 0 yr. is 1.63 ± 1.0 mSv/yr for all pathways. This value is 6.53 times higher compare to the basic radiation dose limit of 2.5E-01 mSv/yr. The evaluated excess cancer risk was 3.46E-3 and is 10 times higher compared to the recommended limit of WHO. A cover layer depth of 1.25 m was simulated using the code and a total maximum peak dose for all pathways was 2.52E-01 mSv/yr at t = 5.0E+2 ± 1.0 years.

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Faculty Opinions recommendation of Radiation dose and breast cancer risk in the childhood cancer survivor study.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1164901.626761 ◽

2009 ◽

Author(s):

Sarah Donaldson ◽

Michael Olson

Keyword(s):

Breast Cancer ◽

Breast Cancer Risk ◽

Radiation Dose ◽

Cancer Risk ◽

Childhood Cancer ◽

Cancer Survivor ◽

Childhood Cancer Survivor ◽

Childhood Cancer Survivor Study

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Radiation Awareness for Endovascular Abdominal Aortic Aneurysm Repair in the Hybrid Operating Room: An Instant Operator Risk Chart for Daily Practice

Journal of Endovascular Therapy ◽

10.1177/15266028211007458 ◽

2021 ◽

pp. 152660282110074

Author(s):

Quirina M. B. de Ruiter ◽

Frans L. Moll ◽

Constantijn E. V. B. Hazenberg ◽

Joost A. van Herwaarden

Keyword(s):

Radiation Dose ◽

Dose Rate ◽

Effect Size ◽

Radiation Risk ◽

Dose Limit ◽

Access Site ◽

Femoral Access ◽

Dose Rates ◽

Rate Prediction ◽

Operator Dose

Introduction: While the operator radiation dose rates are correlated to patient radiation dose rates, discrepancies may exist in the effect size of each individual radiation dose predictors. An operator dose rate prediction model was developed, compared with the patient dose rate prediction model, and converted to an instant operator risk chart. Materials and Methods: The radiation dose rates (DRoperator for the operator and DRpatient for the patient) from 12,865 abdomen X-ray acquisitions were selected from 50 unique patients undergoing standard or complex endovascular aortic repair (EVAR) in the hybrid operating room with a fixed C-arm. The radiation dose rates were analyzed using a log-linear multivariable mixed model (with the patient as the random effect) and incorporated varying (patient and C-arm) radiation dose predictors combined with the vascular access site. The operator dose rate models were used to predict the expected radiation exposure duration until an operator may be at risk to reach the 20 mSv year dose limit. The dose rate prediction models were translated into an instant operator radiation risk chart. Results: In the multivariate patient and operator fluoroscopy dose rate models, lower DRoperator than DRpatient effect size was found for radiation protocol (2.06 for patient vs 1.4 for operator changing from low to medium protocol) and C-arm angulation. Comparable effect sizes for both DRoperator and DRpatient were found for body mass index (1.25 for patient and 1.27 for the operator) and irradiated field. A higher effect size for the DRoperator than DRpatient was found for C-arm rotation (1.24 for the patient vs 1.69 for the operator) and exchanging from femoral access site to brachial access (1.05 for patient vs 2.5 for the operator). Operators may reach their yearly 20 mSv year dose limit after 941 minutes from the femoral access vs 358 minutes of digital subtraction angiography radiation from the brachial access. Conclusion: The operator dose rates were correlated to patient dose rate; however, C-arm angulation and changing from femoral to brachial vascular access site may disproportionally increase the operator radiation risk compared with the patient radiation risk. An instant risk chart may improve operator dose awareness during EVAR.

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Occupational Radiation Dose Limit to the Embryo and Foetus

Australasian Radiology ◽

10.1111/j.1440-1673.1978.tb02597.x ◽

1978 ◽

Vol 22 (2) ◽

pp. 104-104

Author(s):

P. L. T. ILBERY

Keyword(s):

Radiation Dose ◽

Dose Limit ◽

Occupational Radiation

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Uji Efektifitas Dinding Ruangan Panoramik Instalasi Radiologi RSUD Prof. Dr. MA Hanafiah SM Batusangkar Menggunakan TLD-100

Physics Education Research Journal ◽

10.21580/perj.2020.2.2.5087 ◽

2020 ◽

Vol 2 (2) ◽

pp. 95

Author(s):

Dila Nelvo Dasril ◽

Nerifa Dewilza

Keyword(s):

Radiation Dose ◽

General Public ◽

Quantitative Research ◽

Measuring Instrument ◽

Dose Limit ◽

Safety Level ◽

Limit Values ◽

Safety Standards ◽

Direct Measurements

Research on the effectiveness of panoramic room walls has been carried out in the Radiology Installation of Prof. Dr. MA Hanafiah SM Batusangkar. This study aims to determine the effectiveness of the panoramic room walls in absorbing radiation emitted by panoramic aircraft, as well as knowing the safety level of the room around the panoramic inspection room in accordance with the dose limit values of workers and the general public. This type of research is a quantitative research by taking direct measurements. The research was conducted by measuring the radiation dose at six points of the panoramic room wall using a radiation measuring instrument, namely TLD-100. The results showed that the effectiveness of the walls was only able to absorb radiation less than 90%, with the shield category on the walls that was not good enough to withstand radiation. Therefore, it is necessary to renovate the panoramic room walls in accordance with safety standards.

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Stray radiation dose and second cancer risk for a pediatric patient receiving craniospinal irradiation with proton beams

Physics in Medicine and Biology ◽

10.1088/0031-9155/54/8/001 ◽

2009 ◽

Vol 54 (8) ◽

pp. 2259-2275 ◽

Cited By ~ 78

Author(s):

Phillip J Taddei ◽

Dragan Mirkovic ◽

Jonas D Fontenot ◽

Annelise Giebeler ◽

Yuanshui Zheng ◽

...

Keyword(s):

Radiation Dose ◽

Cancer Risk ◽

Pediatric Patient ◽

Craniospinal Irradiation ◽

Second Cancer ◽

Proton Beams ◽

Stray Radiation ◽

Second Cancer Risk

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ASSESSMENT OF NATURAL RADIOACTIVITY IN MAIZE AND ESTIMATION OF CONCOMITANT DOSE TO NIGERIAN VIA INGESTION PATHWAY

Radiation Protection Dosimetry ◽

10.1093/rpd/ncz115 ◽

2019 ◽

Vol 184 (3-4) ◽

pp. 359-362

Author(s):

Mudassir H Yarima ◽

M U Khandaker ◽

A Nadhiya ◽

M A Olatunji

Keyword(s):

Cancer Risk ◽

Natural Radioactivity ◽

Gamma Ray ◽

Gamma Ray Spectrometry ◽

Detailed Knowledge ◽

Dose Limit ◽

Annual Dose ◽

Lifetime Cancer Risk ◽

Environmental Media ◽

Naturally Occurring

Abstract Uranium, thorium and potassium are the most abundant naturally occurring radioactive materials (NORMs) found in soils and other environmental media including foodstuffs. Since the human exposures to NORMs is an unavoidable phenomenon, in such a way that they can easily find their way to human being via food chain, detailed knowledge on their presence in foodstuffs is necessary to assess the radiation dose to the population. Thus, the present study concerns the assessment of natural radioactivity in maize, a staple foodstuff for Nigerian, via HPGe gamma-ray spectrometry. Activity concentrations (Bq/kg) in the maize samples were found to be in the range of 6.1 ± 0.6–8.2 ± 1.3, 2.2 ± 0.4–5.1 ± 0.7 and 288 ± 16–401 ± 24 for 226Ra, 232Th and 40K, respectively. Measured data for 226Ra and 232Th show below the world average values of 67 Bq/kg and 82 Bq/kg, respectively, while the activity of 40K exceeds the global average of 310 Bq/kg. The annual effective dose via the maize consumption was found to be far below the UNSCEAR recommended ingestion dose limit of 290 μSv/y, and the estimated lifetime cancer risk show lower than the ICRP (1991) cancer risk factor of 2.5 × 10−3 based on the additional annual dose limit of 1 mSv for general public, thus pose no adverse health risk to the Nigerian populace.

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Der Einfluß von Röntgenstrahlen auf Ophryotrocha puerilis

Zeitschrift für Naturforschung B ◽

10.1515/znb-1965-0418 ◽

1965 ◽

Vol 20 (4) ◽

pp. 350-355

Author(s):

A. L. Grierson ◽

H. Querner

Keyword(s):

Mortality Rate ◽

Radiation Dose ◽

Total Dose ◽

Growth Zone ◽

Radiation Doses ◽

Effects Of Radiation ◽

Sexually Mature

The polychaet, Ophryotrodia puerilis, which is easily bred in the laboratory, lends itself well to research on the effects of radiation on invertebrates. Growth, which depends on the activity of a growth zone, is accomplished by the addition of segments. It is, therefore, easily recorded quantitatively. Radiation doses up to 100,000 r (3335 r/min) were used. The effect of the radiation depends on the size of animal. In animals of 20 segments the LD 50/30 dose is about 50,000 r; in animals of 10 segments doses of 20,000 r and greater completely inhibit growth, and doses of 10,000 r inhibit the growth of smaller animals. Animals with 10 segments slight retardation of growth after 5,000 and 10,000 r, while the smaller animals do not grow after 10,000 r of radiation and have their growth significantly retarded by 5,000 r. — Eggs laid by sexually mature females treated with 50,000 r fail to develop. After 20,000 and 10,000 r the eggs laid in the first 10 days do not develop but eggs exposed later are capable of develpoment. Animals of 10 segments are fertile after 10,000 r but sterile after 20,000 r. — Fractionation of the radiation dose decreases the mortality rate and, with a total dose of 20,000 r, allows growth. — Irradiation of eggs has an effect that is dependent on the age of the embryo. Up to 9 days 1000 r are lethal; from 10 days on 2000 r have no effect on development. Irradiation with 500 r shows no effect, while two 250 r increments of dose given 48 hours apart kill eggs 2 — 10 days old.

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