Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation shielding for underground low-background experiments   The design task of creating an efficient radiation shield for the new COBRA
double-beta decay experiment led to a comprehensive study of commercially
available shielding materials. The aim was to find the most efficient
combination of materials under the constraints of an extreme low-background
experiment operating in a typical underground laboratory. All existing shield
configurations for this type of experiment have been found to perform
sub-optimally in comparison to the class of multilayered configurations
proposed in this study. The method used here to create a specific shield
configuration should yield a close to optimal result when applied to any
experiment utilising a radiation shield. In particular, the survey of single
material response to a given radiation source turns out to give a guideline for
the construction of efficient multilayer shields.

21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn