Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Assay of low-background stainless steel by smelting for the neutrino
  experiment at Jinping   To ensure compliance with the experimental requirement for ultra-low
background, in this study the radioactivity of stainless steels manufactured by
smelting is thoroughly investigated. Raw materials, stage samples, and
commercial samples are investigated by glow discharge mass spectrometry (GDMS)
and/or with high-purity germanium detectors (HPGe) at both the ground level
and/or the China Jinping Underground Laboratory. Custom-made stainless steel
samples are found to have radioactivity levels comparable to those in other
low-background experiments. The comprehensive results regarding the
radioactivity level in materials to be used in the proposed Jinping Neutrino
Experiment are reported.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio