Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evaluation of ambient dose equivalent rates influenced by vertical and
  horizontal distribution of radioactive cesium in soil in Fukushima Prefecture   The air dose rate in an environment contaminated with 134Cs and 137Cs depends
on the amount, depth profile and horizontal distribution of these contaminants
within the ground. This paper introduces and verifies a tool that models these
variables and calculates ambient dose equivalent rates at 1 m above the ground.
Good correlation is found between predicted dose rates and dose rates measured
with survey meters in Fukushima Prefecture in areas contaminated with
radiocesium from the Fukushima Dai-ichi Nuclear Power Plant accident. This
finding is insensitive to the choice for modelling the activity depth
distribution in the ground using activity measurements of collected soil
layers, or by using exponential and hyperbolic secant fits to the measurement
data. Better predictions are obtained by modelling the horizontal distribution
of radioactive cesium across an area if multiple soil samples are available, as
opposed to assuming a spatially homogeneous contamination distribution.
Reductions seen in air dose rates above flat, undisturbed fields in Fukushima
Prefecture are consistent with decrement by radioactive decay and downward
migration of cesium into soil. Analysis of remediation strategies for farmland
soils confirmed that topsoil removal and interchanging a topsoil layer with a
subsoil layer result in similar reductions in the air dose rate. These two
strategies are more effective than reverse tillage to invert and mix the
topsoil.

7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph