Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation protection at CERN   This paper gives a brief overview of the general principles of radiation
protection legislation; explains radiological quantities and units, including
some basic facts about radioactivity and the biological effects of radiation;
and gives an overview of the classification of radiological areas at CERN,
radiation fields at high-energy accelerators, and the radiation monitoring
system used at CERN. A short section addresses the ALARA approach used at CERN.

11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph