Radioactive Cloud-Dose Calculations.

Healy, J.W.; Baker, R.

doi:10.2172/4485695

Cited by 17 publications

(17 citation statements)

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“…The results obtained for this case have been presented in Fig. 1, for 2 ) varied in magnitude having a maximum value of 17.5 m/s at heights greater than about 1 km. The vertical profiles of the mean resultant wind speed and its angle from the geostrophic wind direction have been shown in Fig.…”

Section: Model Numerical Calculationsmentioning

confidence: 99%

A 3-D Lagrangian (Monte Carlo) Method for Direct Plume Gamma Dose Rate Calculations

Raza

Ávila

Cervantes

2001

Journal of Nuclear Science and Technology

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A fully 3-D Lagrangian particle method has been presented for calculating the direct gamma dose rates due to a radionuclide plume in the atmosphere. A continuous release of radionuclides into the atmosphere was simulated by liberating a large number of Lagrangian particles whose trajectories were tracked for about 25 h in a turbulent atmosphere with a known wind field. The atmosphere turbulent/stability characteristics like wind velocity fluctuations, eddy lifetime,. etc., were obtained from the reported data in the published literature. · For calculating the direct plume gamma dose rates a point isotropic source formula has been used with appropriate attenuation and build-up factors for the air medium. Each Lagrangian particle represented a point source of radioactivity with a known strength. The dose rates at ground due to the radionuclide cloud were calculated by adding the contribution from each Lagrangian particle in the domain. The numerically calculated dose rates were compared with the already reported results. An excellent comparison was observed for a uniform atmosphere with the Gaussian plume model predictions. However, if the wind shear (change in wind direction with height) is taken into account, we observed that for distances exceeding 20 km, the numerical data were below the reported Gaussian Plume Model (GPM) results. This indicated the need of using a modified GPM for extended distances.

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Section: Model Numerical Calculationsmentioning

confidence: 99%

A 3-D Lagrangian (Monte Carlo) Method for Direct Plume Gamma Dose Rate Calculations

Raza

Ávila

Cervantes

2001

Journal of Nuclear Science and Technology

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“…This build-up factor is reported to overestimate dose build-up for nearby point sources and underestimate dose build-up for distant sources (Healy and Baker 1968;Healy 1984).…”

Section: Dose Integralmentioning

confidence: 99%

“…Uniform cloud dose model For ground-level releases, the semi-infinite, uniform cloud model provides a simple, conservative method to estimate dose rates (Healy and Baker 1968;Healy 1984). In this method, a uniform concentration distribution is assumed over the upper half space.…”

Section: Gaussian Plume Modelsmentioning

confidence: 99%

“…In this paper, we show that the dose calculation methodology which is recommended by Healy and Baker (Healy and Baker 1968) and Healy (Healy 1984) for longterm dose estimates due to a sector-averaged plume can be extended to short-term estimates for both ground-level and elevated releases. This method does not require numerical integration for a ground-level source, and it requires only a simple numerical integration or graphical evaluation for elevated sources.…”

Section: Introdumentioning

confidence: 99%

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A Simple Approximation for Estimating Centerline Gamma Absorbed Dose Rates Due to a Continuous Gaussian Plume

Overcamp¹,

Fjeld²

1987

Health Physics

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A simple approximation for estimating the centerline gamma absorbed dose rates due to a continuous Gaussian plume was developed. To simplify the integration of the dose integral, this approach makes use of the Gaussian cloud concentration distribution. The solution is expressed in terms of the I1 and I2 integrals which were developed for estimating long-term dose due to a sector-averaged Gaussian plume. Estimates of tissue absorbed dose rates for the new approach and for the uniform cloud model were compared to numerical integration of the dose integral over a Gaussian plume distribution.

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“…This calculation is made on the basis of the methodology presented by Healy and Baker [9] and incorporated into Nuclear Regulatory Commission (NRC) Regulatory Guide 1.109 [10] for use with noble gas releases from stacks greater than 80 m in height. Once the finite plume dose has been calculated, it is divided by the appropriate dose conversion factor to get an "effective" air concentration.…”

Section: Anemos Estimates Concentrations In Air and Ground Depositionmentioning

confidence: 99%

Comparison of Observed and Predicted KR–85 Air Concentrations

Yildiran

Miller

1984

Studies in Environmental Science

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Radioactive Cloud-Dose Calculations.

Cited by 17 publications

References 0 publications

A 3-D Lagrangian (Monte Carlo) Method for Direct Plume Gamma Dose Rate Calculations

A 3-D Lagrangian (Monte Carlo) Method for Direct Plume Gamma Dose Rate Calculations

A Simple Approximation for Estimating Centerline Gamma Absorbed Dose Rates Due to a Continuous Gaussian Plume

Comparison of Observed and Predicted KR–85 Air Concentrations

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