Importance of self-shielding in mass measurements using γ-ray spectroscopy

Due to the exponential attenuation of photons in materials, thick samples will attenuate a large portion of photons. This is a source of error in methods such as neutron activation analysis, which use gamma spectroscopy to characterise a radioactive source. A method is developed to quantify the magn...

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Published in:	Pramāṇa Vol. 94; no. 1
Main Authors:	Norris, Jesse D, Prasad, Shikha
Format:	Journal Article
Language:	English
Published:	New Delhi Springer India 01-12-2020 Springer Nature B.V
Subjects:	Astronomy Astrophysics and Astroparticles Attenuation Gamma spectroscopy Measurement techniques Neutron activation analysis Observations and Techniques Photons Photopeak Physics Physics and Astronomy Shielding Spectrum analysis 12.10.Dm comparative mass analysis gamma spectroscopy neutron activation analysis self-attenuation Self-shielding 12.60.Jv 11.30.Hv 98.80.Cq
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Abstract	Due to the exponential attenuation of photons in materials, thick samples will attenuate a large portion of photons. This is a source of error in methods such as neutron activation analysis, which use gamma spectroscopy to characterise a radioactive source. A method is developed to quantify the magnitude of self-shielding with the help of MCNP6. Then the mass of an unknown sample is determined by comparing the known sample mass and the photopeak counts of the unknown and the known samples following activation. The inclusion of self-shielding effects is shown to make this comparative mass analysis measurement technique more accurate. Accounting for the self-shielding effects allows the true source, instead of the shielded source, to be resolved by correcting for the photons that are attenuated as they try to escape the sample and reach the detector. The γ -ray measurements were made using several samples of varying shapes.
AbstractList	Due to the exponential attenuation of photons in materials, thick samples will attenuate a large portion of photons. This is a source of error in methods such as neutron activation analysis, which use gamma spectroscopy to characterise a radioactive source. A method is developed to quantify the magnitude of self-shielding with the help of MCNP6. Then the mass of an unknown sample is determined by comparing the known sample mass and the photopeak counts of the unknown and the known samples following activation. The inclusion of self-shielding effects is shown to make this comparative mass analysis measurement technique more accurate. Accounting for the self-shielding effects allows the true source, instead of the shielded source, to be resolved by correcting for the photons that are attenuated as they try to escape the sample and reach the detector. The γ -ray measurements were made using several samples of varying shapes. Due to the exponential attenuation of photons in materials, thick samples will attenuate a large portion of photons. This is a source of error in methods such as neutron activation analysis, which use gamma spectroscopy to characterise a radioactive source. A method is developed to quantify the magnitude of self-shielding with the help of MCNP6. Then the mass of an unknown sample is determined by comparing the known sample mass and the photopeak counts of the unknown and the known samples following activation. The inclusion of self-shielding effects is shown to make this comparative mass analysis measurement technique more accurate. Accounting for the self-shielding effects allows the true source, instead of the shielded source, to be resolved by correcting for the photons that are attenuated as they try to escape the sample and reach the detector. The γ-ray measurements were made using several samples of varying shapes.
ArticleNumber	109
Author	Prasad, Shikha Norris, Jesse D
Author_xml	– sequence: 1 givenname: Jesse D surname: Norris fullname: Norris, Jesse D organization: Lawrence Livermore National Laboratory – sequence: 2 givenname: Shikha surname: Prasad fullname: Prasad, Shikha email: shikhap@tamu.edu organization: Department of Nuclear Engineering, Texas A&M University
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Keywords	12.10.Dm comparative mass analysis gamma spectroscopy neutron activation analysis self-attenuation Self-shielding 12.60.Jv 11.30.Hv 98.80.Cq
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SubjectTerms	Astronomy Astrophysics and Astroparticles Attenuation Gamma spectroscopy Measurement techniques Neutron activation analysis Observations and Techniques Photons Photopeak Physics Physics and Astronomy Shielding Spectrum analysis
Title	Importance of self-shielding in mass measurements using γ-ray spectroscopy
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