United Nations Scientific Committee on the Effects of Atomic Radiation

ATTACHMENT C-21

MAPS OF RATIOS OF DIFFERENT GROUNDDEPOSITION DATASETSUNSCEAR 2013 Report, Annex A, Levels and effects of radiation exposure dueto the nuclear accident after the 2011 great east-Japan earthquake and tsunami,
Appendix C (Assessment of doses to the public)Contents
This attachment provides the maps of the ratios of different ground deposition densities indatasets for 137Cs, 134Cs and 131I that were derived using direct measurements on the ground(see attachments C-1 and C-2), airborne survey [USDOE, 2013] and as estimated using theNOAA-GDAS atmospheric transport, dispersion and deposition modelling (ATDM)
undertaken during this assessment. Attachment C-20 provides the spreadsheets that compare
the ground deposition densities from the ATDM modelling, the MEXT ground survey and theNNSA airborne survey results.
USDOE. US DOE/NNSA Response to 2011 Fukushima Incident – raw aerial data andextracted ground exposure. US Department of Energy. [Internet] Available from(https://explore.data.gov/d/prrn-6s35) on 21 March 2013.
Notes
The designations employed and the presentation of material in this publication do not imply theexpression of any opinion whatsoever on the part of the Secretariat of the United Nations
concerning the legal status of any country, territory, city or area, or of its authorities, orconcerning the delimitation of its frontiers or boundaries.
©

United Nations, December 2014. All rights reserved, worldwide.

This publication has not been formally edited.

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Figure I. Ratio of Cs ground deposition densities for NNSA airborne survey to those of the MEXT ground deposition dataset(decay corrected to 14 June 2011)

Cs ground deposition ratio
NNSA / MEXTATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

137

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Figure II. Ratio of Cs ground deposition densities derived from atmospheric transport, dispersion and deposition modelling (NOAA-GDAS Model)
to those of the NNSA airborne survey (decay corrected to 14 June 2011)137

ATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

Cs ground deposition ratio
ATDM / NNSANOAA-GDAS Model34137

Figure III. Ratio of the Cs ground deposition densities derived from atmospheric transport, dispersion and deposition modelling (NOAA-GDASModel) to those of the MEXT ground deposition dataset (decay corrected to 14 June 2011)137

ATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

Cs ground deposition ratio
ATDM / MEXTNOAA-GDAS Model

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Figure IV. Ratio of the Cs ground deposition densities for the NNSA airborne survey to those of the MEXT ground deposition dataset(decay corrected to 14 June 2011)134

ATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

Cs ground deposition ratio
NNSA / MEXT

56134

Figure V. Ratio of the Cs ground deposition densities derived from atmospheric transport, dispersion and deposition modelling (NOAA-GDASModel) to those of the NNSA airborne survey (decay corrected to 14 June 2011)134

ATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

Cs ground deposition ratio
ATDM / NNSANOAA-GDAS Model

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Figure VI.
Cs ground deposition ratio - atmospheric transport, dispersion and deposition modelling (NOAA-GDAS Model) to the MEXT grounddeposition dataset (decay corrected to 14 June 2011)134

ATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

Cs ground deposition ratio
ATDM / MEXTNOAA-GDAS Model

78131Figure VII. Ratio of the I ground deposition densities derived from atmospheric transport, dispersion and deposition modelling (NOAA-GDASModel) to those of the MEXT ground deposition dataset (decay corrected to 14 June 2011)131

ATTACHMENT C-21: MAPS OF RATIOS OF DIFFERENT GROUND DEPOSITION DATASETS

I ground deposition ratio
ATDM / MEXTNOAA-GDAS Model