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NSR database version of April 11, 2024.

Search: Author = M.P.Unterweger

Found 21 matches.

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2016PO08      Phys.Lett. B 761, 281 (2016)

S.Pomme, H.Stroh, J.Paepen, R.Van Ammel, M.Marouli, T.Altzitzoglou, M.Hult, K.Kossert, O.Nahle, H.Schrader, F.Juget, C.Bailat, Y.Nedjadi, F.Bochud, T.Buchillier, C.Michotte, S.Courte, M.W.van Rooy, M.J.van Staden, J.Lubbe, B.R.S.Simpson, A.Fazio, P.De Felice, T.W.Jackson, W.M.Van Wyngaardt, M.I.Reinhard, J.Golya, S.Bourke, T.Roy, R.Galea, J.D.Keightley, K.M.Ferreira, S.M.Collins, A.Ceccatelli, M.Unterweger, R.Fitzgerald, D.E.Bergeron, L.Pibida, L.Verheyen, M.Bruggeman, B.Vodenik, M.Korun, V.Chiste, M.-N.Amiot

Evidence against solar influence on nuclear decay constants

RADIOACTIVITY ²⁰⁹Po, ²²⁶Ra, ²²⁸Th, ²³⁰U, ²⁴¹Am(α), ³H, ¹⁴C, ⁶⁰Co, ⁸⁵Kr, ⁹⁰Sr, ¹²⁴Sb, ^134,137Cs(β^-), ⁵⁴Mn, ⁵⁵Fe, ⁵⁷Co, ^82,85Sr, ¹⁰⁹Cd, ¹³³Ba(EC), ²²Na, ⁶⁵Zn, ²⁰⁷Bi(EC), (β⁺), ¹⁵²Eu(β^-), (EC), (β⁺); measured decay products; deduced decay constant vs. solar activity, exponential nature of nuclear decay.

doi: 10.1016/j.physletb.2016.08.038
Citations: PlumX Metrics

2014UN01      Appl.Radiat.Isot. 87, 92 (2014); Erratum Appl.Radiat.Isot. 159, 108976 (2020)

M.P.Unterweger, R.Fitzgerald

Update of NIST half-life results corrected for ionization chamber source-holder instability

RADIOACTIVITY ¹⁸F, ²²Na, ⁵¹Cr, ⁵⁴Mn, ^57,58Co, ⁶²Cu, ⁶⁵Zn, ⁶⁷Ga, ⁸⁵Sr, ⁸⁸Y, ¹⁰⁹Cd, ¹¹¹In, ¹¹³Sn, ^123,125I, ¹²⁷Xe, ¹³⁹Ce, ¹⁵³Sm, ¹⁶⁹Yb, ¹⁸¹W, ¹⁹⁵Au, ^201,202Tl, ²⁰³Pb, ²⁰⁷Bi(EC), ²⁴Na, ³²P, ⁴⁶Sc, ⁵⁹Fe, ⁶⁰Co, ⁷⁵Se, ⁸⁵Kr, ⁹⁹Mo, ⁹⁹Tc, ¹⁰³Ru, ¹¹⁰Ag, ¹²⁵Sb, ¹³¹I, ¹³³Xe, ¹³³Ba, ^134,137Cs, ¹⁴⁰Ba, ¹⁴⁰La, ^141,144Ce, ^152,154,155Eu, ¹⁵³Gd, ¹⁶⁶Ho, ^186,188Re, ¹⁸⁸W, ¹⁹²Ir, ¹⁹⁸Au, ²⁰³Hg, ²²⁸Th(β^-), ¹³¹Xe(IT); analyzed decay products, Eβ, Iβ, Eγ, Iγ; deduced T_1/2 updated values, fixed mistake in the propagation of the correction factor, f, and its associated uncertainty. Comparison with the previous measurements at NIST.

doi: 10.1016/j.apradiso.2013.11.017
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2012UN01      Appl.Radiat.Isot. 70, 1892 (2012)

M.P.Unterweger, R.Fitzgerald

Unexpected bias in NIST 4πγ ionization chamber measurements

RADIOACTIVITY ⁸⁵Kr, ¹³³Xe(β^-), ²⁴¹Am(α), ¹²⁵I(EC); measured decay products, Eγ, Iγ; deduced corrected values for T_1/2 and low-energy γ-rays.

doi: 10.1016/j.apradiso.2012.02.023
Citations: PlumX Metrics

2009PI02      Appl.Radiat.Isot. 67, 636 (2009)

L.Pibida, R.Fitzgerald, M.Unterweger, M.M.Hammond, D.Golas

Measurements of the ⁸²Sr half-life

RADIOACTIVITY ⁸²Sr(EC); measured half-life.

doi: 10.1016/j.apradiso.2008.11.017
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2005LI66      J.Radioanal.Nucl.Chem. 263, 311 (2005)

R.M.Lindstrom, M.Blaauw, M.P.Unterweger

QA/QC Procedures, Validation Method, Traceability and Intercomparisons; The half-lives of ²⁴Na, ⁴²K, and ¹⁹⁸Au

RADIOACTIVITY ²⁴Na(β^-), ⁴²K(β^-), ¹⁹⁸Au(β^-); measured Eγ, Iγ, isotopic T_1/2.

doi: 10.1007/s10967-005-0587-y
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2004UN01      Appl.Radiat.Isot. 60, 325 (2004)

M.P.Unterweger, R.M.Lindstrom

Ionization chamber measurements of the half-lives of ²⁴Na, ⁴²K, ⁷⁶As and ¹⁹⁸Au

RADIOACTIVITY ²⁴Na, ⁴²K, ⁷⁶As, ¹⁹⁸Au(β^-); measured T_1/2. Ionization chamber, comparison with previous results.

doi: 10.1016/j.apradiso.2003.11.035
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2002UN02      Appl.Radiat.Isot. 56, 125 (2002)

M.P.Unterweger

Half-Life Measurements at the National Institute of Standards and Technology

RADIOACTIVITY ²²Na, ¹³³Ba, ²⁰⁷Bi(EC); ⁶⁰Co, ⁸⁵Kr, ¹²⁵Sb, ¹³⁷Cs, ¹⁵⁵Eu(β^-); ^152,154Eu(EC), (β^-); measured T_1/2. Comparison with previous results.

COMPILATION ³H, ¹⁸F, ^22,24Na, ³²P, ⁴⁶Sc, ⁵¹Cr, ⁵⁴Mn, ^57,58,60Co, ⁵⁹Fe, ⁶²Cu, ⁶⁵Zn, ⁶⁷Ga, ⁷⁵Se, ⁸⁵Kr, ⁸⁵Sr, ⁸⁸Y, ⁹⁹Mo, ^99mTc, ¹⁰³Ru, ¹⁰⁹Cd, ^110mAg, ¹¹¹In, ^113,117mSn, ^123,125,131I, ¹²⁵Sb, ^127,131m,133Xe, ^133,140Ba, ^134,137Cs, ^139,141,144Ce, ¹⁴⁰La, ^152,154,155Eu, ¹⁵³Gd, ¹⁵³Sm, ¹⁶⁶Ho, ¹⁶⁹Yb, ¹⁷⁷Lu, ^181,188W, ^186,188Re, ¹⁹²Ir, ^195,198Au, ^201,202Tl, ²⁰³Hg, ²⁰³Pb, ²⁰⁷Bi, ²²⁸Th; compiled T_1/2.

doi: 10.1016/S0969-8043(01)00177-4
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2002ZI01      Appl.Radiat.Isot. 56, 315 (2002)

B.E.Zimmerman, J.T.Cessna, M.P.Unterweger

The Standardization of ¹⁸⁸W/¹⁸⁸Re by 4πβ Liquid Scintillation Spectrometry with the CIEMAT/NIST ³H-Standard Efficiency Tracing Method

RADIOACTIVITY ¹⁸⁸W, ¹⁸⁸Re(β^-); measured Eγ, Iγ, βγ-coin; deduced source standardization. Liquid scintillation counting with efficiency tracing method.

doi: 10.1016/S0969-8043(01)00207-X
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2001ZI01      Appl.Radiat.Isot. 54, 623 (2001)

B.E.Zimmerman, M.P.Unterweger, J.W.Brodack

The Standardization of ¹⁷⁷Lu by 4πβ Liquid Scintillation Spectrometry with ³H-Standard Efficiency Tracing

RADIOACTIVITY ¹⁷⁷Lu(β^-); measured T_1/2. Efficiency tracing, standardization.

doi: 10.1016/S0969-8043(00)00316-X
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2000LU17      J.Res.Natl.Inst.Stand.Technol. 105, 541 (2000)

L.L.Lucas, M.P.Unterweger

Comprehensive Review and Critical Evaluation of the Half-Life of Tritium

RADIOACTIVITY ³H(β^-); compiled, evaluated T_1/2.

doi: 10.6028/jres.105.043
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2000UN02      Appl.Radiat.Isot. 52, 527 (2000)

M.P.Unterweger, L.L.Lucas

Calibration of the National Institute of Standards and Technology tritiated-water standards

RADIOACTIVITY ³H(β^-); measured decay products; deduced T_1/2. Comparison with the ENSDF data. NBS/NIST tritiated water SRMs.

doi: 10.1016/s0969-8043(99)00205-5
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1997ZI06      J.Phys.(London) G23, 1707 (1997)

B.E.Zimmerman, M.P.Unterweger, J.T.Cessna

The Half-Life of ⁶²Cu

RADIOACTIVITY ⁶²Cu(β⁺); measured T_1/2. 4π liquid scintillator, ionization chamber.

doi: 10.1088/0954-3899/23/11/018
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1996BE48      Nucl.Instrum.Methods Phys.Res. A369, 684 (1996)

M.J.Berger, M.P.Unterweger, J.M.R.Hutchinson

The Influence of Backing and Covering Materials on the 2π-Counting Efficiencies of Beta-Particle Source

RADIOACTIVITY ⁹⁰Sr(β^-); ⁹⁰Y(β^-) [from ⁹⁰Sr(β^--decay)]; ³⁶Cl(β^-), (EC), (β⁺); ²⁰⁴Tl(β^-), (EC); ¹³⁷Cs(β^-); ⁶⁰Co(β^-); ⁹⁹Tc(β^-); ¹⁴⁷Pm(β^-); ¹⁴C(β^-); ²⁸Al(β^-); measured 2π-β counting rates; calculated 2π-β counting rates, Eβ, Iβ(θ). Monte Carlo techniques.

doi: 10.1016/S0168-9002(96)80076-3
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1994CO02      Nucl.Instrum.Methods Phys.Res. A339, 26 (1994)

B.M.Coursey, J.M.Calhoun, J.Cessna, D.B.Golas, F.J.Schima, M.P.Unterweger

Liquid-Scintillation Counting Techniques for the Standardization of Radionuclides used in Therapy

RADIOACTIVITY ¹⁰⁹Pd(β^-); ^114mIn(EC); ¹²³I(EC); ¹⁵³Gd(EC); ¹⁵³Sm(β^-); ¹⁵⁴Eu(EC), (β^-); ¹⁵⁵Eu(β^-); ¹⁶⁶Ho(β^-); ¹⁶⁹Yb(EC); ¹⁸⁶Re(EC), (β^-); ¹⁸⁸Re(β^-); measured γ emission rates; deduced deviations from previous data. ³²P, ¹⁵³Sm, ¹⁶⁶Ho, ^186,188Re(β^-) measured T_1/2. Liquid scintillation counting, radionuclides standardization for therapy.

doi: 10.1016/0168-9002(94)91773-6
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1994MA51      Nucl.Instrum.Methods Phys.Res. A339, 343 (1994)

J.L.Makepeace, F.E.Clark, J.L.Picolo, N.Coursol, E.Gunther, M.P.Unterweger

Intercomparison of Internal Proportional Gas Counting of ⁸⁵Kr and ³H

COMPILATION ³H(β^-); ⁸⁵Kr(β^-); compiled, reviewed data; deduced internal proportional gas counting international intercomparison.

doi: 10.1016/0168-9002(94)91829-5
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1992UN01      Nucl.Instrum.Methods Phys.Res. A312, 349 (1992)

M.P.Unterweger, D.D.Hoppes, F.J.Schima

New and Revised Half-Life Measurements Results

RADIOACTIVITY ⁶⁰Co(β^-); ¹³⁷Cs(β^-); ⁸⁵Kr(β^-); ²²Na(β⁺), ¹³³Ba(EC); ²⁰⁷Bi(EC), (β⁺); ¹²⁵Sb(β^-); ¹⁵²Eu(EC)(β⁺); ¹⁵⁴Eu(EC), (β^-), (β^-), (β⁺); ¹⁵⁵Eu(β^-); measured T_1/2; deduced revised T_1/2. Comparison with recommended values.

doi: 10.1016/0168-9002(92)90180-C
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1991CO17      Appl.Radiat.Isot. 42, 865 (1991)

B.M.Coursey, J.Cessna, E.Garcia-Torano, D.B.Golas, A.Grau Malonda, D.H.Gray, D.D.Hoppes, J.M.Los Arcos, M.T.Martin-Casallo, F.J.Schima, M.P.Unterweger

The Standardization and Decay Scheme of Rhenium-186

RADIOACTIVITY ¹⁸⁶Re(β^-), (EC) [from reactor irradiation of ¹⁸⁵Re]; measured T_1/2, photon emission rates; deduced source standardization. ¹⁸⁶Os transition deduced γ-emission probability. Pressurized ionization chamber.

doi: 10.1016/0883-2889(91)90226-Q
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1987CO04      Appl.Radiat.Isot. 38, 31 (1987)

B.M.Coursey, D.D.Hoppes, F.J.Schima, M.P.Unterweger

The Standardization of Samarium-153

RADIOACTIVITY ¹⁵³Sm(β^-); measured T_1/2, probability per decay for 103.2 keV γ-ray. 4π β liquid scintillation counter.

doi: 10.1016/0883-2889(87)90232-2
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1983CO20      Int.J.Appl.Radiat.Isotop. 34, 1181 (1983)

B.M.Coursey, D.D.Hoppes, M.P.Unterweger, A.Grau Malonda, R.A.Margolin, R.M.Kessler, R.Manning

Standardization of ¹⁸F for Use in Positron-Emission Tomography

RADIOACTIVITY ¹⁸F(β⁺), (EC) [from ²⁰Ne(d, α), E=22 MeV]; measured β⁺ emission rates. 4π β liquid scintillator, 4π γ ionization chamber, source standardization, ²²Na calibration.

doi: 10.1016/0020-708X(83)90186-2
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1980UN01      Appl.Radiat.Isot. 31, 611 (1980)

M.P.Unterweger, B.M.Coursey, F.J.Schima, W.B.Mann

Preparation and Calibration of the 1978 National Bureau of Standards Tritiated-Water Standards

doi: 10.1016/0020-708X(80)90017-4
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1974CA27      Phys.Rev. C10, 2631 (1974)

L.M.Cavallo, F.J.Schima, M.P.Unterweger

Decay of ¹³³Xe-g

RADIOACTIVITY ^133gXe; measured T_1/2, γ relative intensity. Enriched source, 4πγ pressure chamber, Ge(Li) detector.

doi: 10.1103/PhysRevC.10.2631
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Note: The following list of authors and aliases matches the search parameter M.P.Unterweger: , M.P.UNTERWEGER