Low-background Germanium spectrometry the bottom line three years later

Brodzinski, R. L.; Miley, H.S.; Reeves, J.H.; Avignone, F.T.

doi:10.1007/bf02041917

Cited by 24 publications

(23 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of these advances are discussed in [1] and are similar to those referenced for the best newlyproduced commercial cryogenic-grade (NOSV) high-purity copper [3]. First, the purity of the H 2 SO 4 was improved through sub-boiling distillation and processed and stored without contact with glassware.…”

Section: Chemistry and Puritymentioning

confidence: 72%

See 1 more Smart Citation

Ultra-Low-Background Copper Production and Clean Fabrication

Aalseth¹,

Brodzinski²,

Farmer³

et al. 2005

AIP Conference Proceedings

View full text Add to dashboard Cite

Commercial high-purity copper is an attractive material for constructing ultra-low-background radiation measurement devices. When even higher purity is desired, additional electrolytic and chemical purification can be combined with the final fabrication step. This process results in "electroformed" copper parts of extreme purity. Copper electroforming can be done underground, providing a way to eliminate cosmogenic activation products seen in copper that has had above-ground exposure. A brief summary of the history, cosmogenics, process chemistry, cleaning, and passivation of this material is given. Examples of finished parts illustrate the method. The required infrastructure is summarized.

show abstract

Section: Chemistry and Puritymentioning

confidence: 72%

“…A factor of 100 reduction in uranium progeny and a factor of 10 reduction for thorium progeny was achieved [1]. Uranium and thorium progeny were reduced substantially over early work.…”

Section: Chemistry and Puritymentioning

confidence: 98%

Ultra-Low-Background Copper Production and Clean Fabrication

Aalseth¹,

Brodzinski²,

Farmer³

et al. 2005

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Of particular concern is the copper used for our cryostats, which is chemically purified and electroformed into components to control radiological backgrounds. A specialized measurement of copper produced in 1995 with this procedure [5] estimated that the electroformed copper contained <25 mBq/kg 226 Ra and «9 mBq/kg 228 Th. Since then these results have been reanalyzed, suggesting the possibility that the activity was neither in the copper or the lead shielding.…”

Section: Radiological Backgroundsmentioning

confidence: 99%

The Majorana project: determining mββ to the 50 meV scale through ββ measurements in 76Ge

Young¹

2004

AIP Conference Proceedings

View full text Add to dashboard Cite

Absolute neutrino mass scale determination with the KATRIN experiment AIP Conf.Abstract The goal of the Majorana project is to provide limits on the effective neutrino mass at the level of 50 meV through measurements of neutrinoless double beta-decay in 76 Ge. The planned experiment relies entirely on proven technology and uses materials and techniques demonstrated to produce the lowest background per kilogram of fiducial germanium. It will utilize 500 kg of germanium detector material enriched to 86% 76 Ge. Each detector subunit will be segmented and instrumented for digital pulse acquisition, with both the segmentation and pulse digitization providing us with powerful signatures for background signals coming from processes other than neutrinoless double beta-decay. We present an overview of the Majorana project and include some details characterizing a prototype for our segmented detector elements: SEGA (the Segmented, Enriched Germanium Assembly).

show abstract

“…The starting background assumed is that achieved by IGEX, prior to pulse-shape discrimination, which was b 0 = 0.2 counts/keV/kg/y at the 0ν ββ-decay energy of 2039 keV. This background was achieved at 4000 mwe and was completely accounted for as the decay of cosmogenic isotopes in the germanium [24]. The decay of 68 Ge (270.8-day half-life) and 60 Co (5.7-year half-life) over the 10-year counting period, combined with estimates of reduced above-ground cosmogenic activation and additional decay during detector construction, reduces this background by an overall factor of about twenty, com-pared to the IGEX background mentioned.…”

Section: The Majoranamentioning

confidence: 99%

“…Thus deposition-location multiplicity distinguishes double-beta decay from the important long lived cosmogenics in germanium. Isotopes such as 56 Co, 57 Co, 58 Co, and 68 Ge are produced at a rate of roughly 1 atom per day per kilogram on the earths surface [24]. Only 60 Co and 68 Ge have both the energy and half-life to be of concern.…”

Section: Recent Progress In Ge Detector Technologymentioning

confidence: 99%