Radioassay and Purification for Experiments at Y2L and Yemilab in Korea

Lee, Moo Hyun

doi:10.1088/1742-6596/1468/1/012249

Cited by 15 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Radiopurity in the raw and purified powders and the mother solution from the purification process is measured by an inductively coupled plasma mass spectrometry (ICP-MS) and high-purity Germanium (HPGe) detector [32]. The water content in the produced powders is measured by the Karl-Fisher titrator.…”

Section: Methodsmentioning

confidence: 99%

A facility for mass production of ultra-pure NaI powder for the COSINE-200 experiment

et al. 2020

View full text Add to dashboard Cite

COSINE-200 is the next phase experiment of the ongoing COSINE-100 that aims to unambiguously verify the annual modulation signals observed by the DAMA experiment and to reach the world competitive sensitivity on the low-mass dark matter search. To achieve the physics goal of the COSINE-200, the successful production of the low-background NaI(Tl) detectors is crucial and it must begin from the mass production of the ultra-low background NaI powder. A clean facility for massproducing the pure-NaI powder has been constructed at the Center for Underground Physics (CUP) in Korea. Two years of operation determined efficient parameters of the mass purification and provided a total of 480 kg of the ultra-pure NaI powder in hand. The potassium concentration in the produced powders varied from 5.4 to 11 ppb, and the maximum production capacity of 35 kg per two weeks was achieved. Here, we report our operational practice with the mass purification of the NaI powder, which includes raw powder purification, recycling of the mother solution, and recovery of NaI from the residual melt that remained after crystal growth.

show abstract

Section: Methodsmentioning

confidence: 99%

A facility for mass production of ultra-pure NaI powder for the COSINE-200 experiment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…1(d) sealed the detection volume, keeping a high concentration of nitrogen gas in the volume. A radon reduction system (RRS) supplied air to the laboratory with concentrations of 222 Rn significantly reduced relative to the tunnel environment [26].…”

Section: Methodsmentioning

confidence: 99%

Measurement of the Background Activities of a 100Mo-enriched Powder Sample for an AMoRE Crystal Material by Using a Single High-Purity Germanium Detector

Park

Hahn

Kang

et al. 2020

J. Korean Phys. Soc.

Self Cite

View full text Add to dashboard Cite

The Advanced Molybdenum-based Rare process Experiment in its second phase (AMoRE-II) will search for neutrinoless double-beta (0νββ) decay of 100 Mo in 200 kg of molybdate crystals. To achieve the zero-background level in the energy range of the double-beta decay Q-value of 100 Mo, the radioactive contamination levels in AMoRE crystals should be low. 100Enr MoO3 powder, which is enriched in the 100 Mo isotope, is used to grow the AMoRE crystals. A shielded array of fourteen highpurity germanium detectors with 70% relative efficiency each was used for the measurement of background activities in a sample of 9.6-kg powder. The detector system named CAGe located at the Yangyang underground laboratory was designed for measuring low levels of radioactivity from natural radioisotopes or cosmogenic nuclides such as 228 Ac, 228 Th, 226 Ra, 88 Y, and 40 K. The activities of 228 Ac and 228 Th in the powder sample were 0.88 ± 0.12 mBq/kg and 0.669 ± 0.087 mBq/kg, respectively. The activity of 226 Ra was measured to be 1.50 ± 0.23 mBq/kg. The activity of 88 Y was 0.101 ± 0.016 mBq/kg. The activity of 40 K was found as 36.0 ± 4.1 mBq/kg.

show abstract

“…The details of the facility and recrystallization procedure are described elsewhere in [29]. Radiopurity in the raw and purified powders and the mother solution from the purification process is measured by an inductively coupled plasma mass spectrometry (ICP-MS) and high-purity Germanium (HPGe) detector [34]. The water content in the produced powders is measured by the Karl-Fisher titrator.…”

Section: Methodsmentioning

confidence: 99%

Mass production of ultra-pure NaI powder for COSINE-200

et al. 2023

Self Cite

View full text Add to dashboard Cite

COSINE-200 is the next phase experiment of the ongoing COSINE-100 that aims to unambiguously verify the annual modulation signals observed by the DAMA experiment and to reach the world competitive sensitivity on the low-mass dark matter search. To achieve the physics goal of the COSINE-200, the successful production of the low-background NaI(Tl) detectors is crucial and it must begin from the mass production of the ultra-low background NaI powder. A clean facility for mass-producing the pure-NaI powder has been constructed at the Center for Underground Physics (CUP) in Korea. Two years of operation determined efficient parameters of the mass purification and provided a total of 480 kg of the ultra-pure NaI powder in hand. The potassium concentration in the produced powders varied from 5.4 to 11 ppb, and the maximum production capacity of 35 kg per 2 weeks was achieved. Here, we report our operational practice with the mass purification of the NaI powder, which includes raw powder purification, recycling of the mother solution, and recovery of NaI from the residual melt after crystal growth.

show abstract

Radioassay and Purification for Experiments at Y2L and Yemilab in Korea

Cited by 15 publications

References 6 publications

A facility for mass production of ultra-pure NaI powder for the COSINE-200 experiment

A facility for mass production of ultra-pure NaI powder for the COSINE-200 experiment

Measurement of the Background Activities of a 100Mo-enriched Powder Sample for an AMoRE Crystal Material by Using a Single High-Purity Germanium Detector

Mass production of ultra-pure NaI powder for COSINE-200

Contact Info

Product

Resources

About