Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the emission probability of the 66.7 keV {\gamma}-transition in the
  decay of 171Tm   The {\gamma}-emission probability of the 66.73 keV line in the decay of 171Tm
has been experimentally determined using {\gamma}-spectrometry and inductively
coupled mass spectrometry. Using a set of two reference sources, namely 60Co as
primary standard and 44Ti/44Sc in secular equilibrium as secondary standards,
we were able to deduce the detection efficiency at 67.87 keV of the used
{\gamma}-spectrometry setup with high precision. The emission probability of
the 66.73 keV {\gamma}-transition in the decay of 171Tm has been determined
with a set of three radioisotopically pure 171Tm samples to be 0.159(6) %.

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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga