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On the use of ?/n c...
On the use of ?/n correlations in multiplicity counting in small samples
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- Trombetta, Débora M. (författare)
- KTH,Fysik,KTH Royal Inst Technol, Dept Phys, Roslagstullsbacken 21, S-11421 Stockholm, Sweden.
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- Göök, Alf (författare)
- Uppsala universitet,KTH,Kärnfysik,Uppsala Univ, Dept Phys & Astron, POB 516, S-75120 Uppsala, Sweden.,Tillämpad kärnfysik,KTH Royal Inst Technol, Dept Phys, Roslagstullsbacken 21, S-11421 Stockholm, Sweden.
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(creator_code:org_t)
- Elsevier BV, 2022
- 2022
- Engelska.
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Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 1040
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Abstract
Ämnesord
Stäng
- The use of liquid scintillation detectors provides the possibility to acquire information about both gamma-rays and neutrons. The capability of plutonium detection via gamma/n coincidences in liquid scintillation detectors is well demonstrated in the literature, and it is also acknowledged that correlated gamma/n detection can offer better sensitivity and signal to noise ratio compared to neutron-neutron for some applications. In this paper we perform an assessment of the use of gamma/n coincidence counting in small samples, what may have use in the context of nuclear safeguards. We formulate the expected number of gamma/n coincidences and calculate the average and covariance of gamma-ray and neutron multiplicities for Pu-238, Pu-240, Pu-242 and Cf-252. The multiplicative coefficients for the Pu-240 effective mass equation was then calculated using gamma/n coincidences, and Monte Carlo simulations performed in order to model the detection of neutrons and gamma-rays inside liquid scintillation detectors. We conclude that gamma/n coincidence counting still has potential capabilities when the objective is the detection of plutonium, but its use for plutonium effective mass quantification is limited compared to n/n coincidence counting. Nevertheless, the method could still be applicable for the purpose of plutonium mass quantification by using a calibration curve that is specific to a sample's mass and size.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Gamma and neutron multiplicities
- Nuclear safeguards
- Nuclear material accountability and control
- Plutonium effective mass
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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