Adaptive point kernel dose assessment method for cutting simulation on irregular geometries in nuclear facility decommissioning

2018 ◽  
Vol 150 ◽  
pp. 125-136 ◽  
Author(s):  
Nan Chao ◽  
Yong-kuo Liu ◽  
Hong Xia ◽  
Abiodun Ayodeji ◽  
Huan Yang
Keyword(s):  
Assessment Method ◽  
Dose Assessment ◽  
Nuclear Facility ◽  
Cutting Simulation ◽  
Irregular Geometries

Virtual reality-based adaptive dose assessment method for arbitrary geometries in nuclear facility decommissioning

2018 ◽  
Vol 38 (3) ◽  
pp. 951-966 ◽  
Author(s):  
Yong-kuo Liu ◽  
Nan Chao ◽  
Hong Xia ◽  
Min-jun Peng ◽  
Abiodun Ayodeji
Keyword(s):  
Virtual Reality ◽  
Assessment Method ◽  
Dose Assessment ◽  
Nuclear Facility ◽  
Arbitrary Geometries

Validation of a Dose Assessment Method to be Used in 18F FDG Loose Contamination Exercises

2021 ◽  
Vol 120 (3) ◽  
pp. 353-359
Author(s):  
Miles L. Chen ◽  
Lainy D. Cochran ◽  
Craig M. Marianno
Keyword(s):  
Assessment Method ◽  
Dose Assessment ◽  
18F Fdg

scholarly journals Assessment of conservatism of assumptions on the population exposure conditions applied for establishing the permissible atmospheric release levels

2021 ◽  
Vol 14 (1) ◽  
pp. 60-67
Author(s):  
A. I. Kryshev ◽  
A. A. Buryakova ◽  
M. E. Vasyanovich ◽  
A. A. Ekidin
Keyword(s):  
Dose Assessment ◽  
Population Exposure ◽  
Emission Sources ◽  
Nuclear Facility ◽  
Internal Radiation ◽  
Annual Dose ◽  
Protection Zone ◽  
Permanent Resident ◽  
Atmospheric Release ◽  
Exposure Conditions

The annual permissible atmospheric release levels of radionuclides are established with the condition that the population annual dose should not exceed the dose quota. Two conservative assumptions on the population exposure are applied in handbooks for calculation of the permissible release levels: a person can reside in any point outside the sanitary protection zone of nuclear facility; all exposure pathways, including food consumption, are determined by the place of residence. Calculation of the annual dose for adults living near the Smolensk, Rostov and Bilibino NPP was performed for three scenarios to evaluate the degree of conservatism of these assumptions. Scenario 1 assumed permanent residence in a critical point of the area with production of all food in this point and consumption only local food by the population. Scenario 2 assumed that a certain part of food is imported. In scenario 3 dose assessment was made for a permanent resident of the closest settlement near NPP, taking into consideration realistic characteristics of the exposure conditions. Atmospheric release levels of radionuclides assessed during the radiation and technical surveys of the NPP’s emission sources in 2017 – 2019 were used as the initial data. It is shown that the assumptions on the conditions of population exposure significantly affect the conservatism of the annual dose assessment. The calculated annual dose for the most conservative scenario is higher than for realistic scenario by 6,3 times (for the Smolensk NPP), 8,4 times (Rostov NPP), 883 times (Bilibino NPP). The highest degree of conservatism was shown for the internal radiation dose estimates. The results of calculation of the annual dose from NPP’s emissions strongly depend on the method for dose assessment from releases of 3H and 14C. Use of the regional values of consumption of locally produced food allows reasonable reducing the conservatism of the annual dose estimates from the NPP’s permanent radionuclide releases.

Low Dose Assessment Uncertainty Analysis for Landauer® nanoDot™ OSLDs

2021 ◽  
Author(s):  
Egemen Aras ◽  
Robert Hayes
Keyword(s):  
Low Dose ◽  
Background Radiation ◽  
Measurement Data ◽  
Initial Step ◽  
Dose Assessment ◽  
Statistical Fluctuation ◽  
Nuclear Facility ◽  
Data Set ◽  
Significant Difference ◽  
Dose Levels

Abstract This study aims to low-level background range measurements of commercial OSLDs. This work is the initial step to put a framework to detect any illicit nuclear activities in any nuclear facility at any time. The idea in this framework is to utilize already placed OSLDs in the facility which are normally read-out periodically. The results of these measurements could be distinguishable from the background radiation since this paper shows how the background dose with its statistical fluctuation provide detection limits in these applications. To do this, we measured dosimeters in two ways; without removal or replacement and full removal for each measurement. As a result of measurements, the initial dose, bleaching constant, and background dose was evaluated for different measurements. ANOVA was applied to all measurements and all measurements considered a measurement data set to analyze results. Consequently, we observed no statistically significant difference in these different kinds of measurement approaches relative to the total propagated uncertainty in any given dose estimate. This shows a passive detection can be verified with iterative measurements to improve statistics without compromising data quality when coupled with dose levels of potential interest serves to advance this potential nonproliferation application.

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