Half-life measurement of 124Sb

Paepen, J.; Altzitzoglou, T.; Ammel, R. Van; Sibbens, G.; Pommé, S.

doi:10.1016/j.apradiso.2009.11.050

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…Two 226 Ra sources (#1 and #2) are frequently measured in the IG12 welltype IC (20 th Century Electronics, UK) filled with argon to 2 MPa. The ionisation current is measured by sampling a voltage over an external feedback air-spaced capacitor [73]. In off-line data analysis, it is corrected for average background signal and decay.…”

Section: Ra Series @Jrcmentioning

confidence: 99%

On decay constants and orbital distance to the Sun—part I: alpha decay

et al. 2016

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Claims that proximity to the Sun causes variation of decay constants at permille level have been investigated for alpha decaying nuclides. Repeated decay rate measurements of 209 Po, 226 Ra, 228 Th, 230 U, and 241 Am sources were performed over periods of 200 d up to two decades at various nuclear metrology institutes around the globe. Residuals from the exponential decay curves were inspected for annual oscillations. Systematic deviations from a purely exponential decay curve differ in amplitude and phase from one data set to another and appear attributable to instabilities in the instrumentation and measurement conditions. The most stable activity measurements of α decaying sources set an upper limit between 0.0006% and 0.006% to the amplitude of annual oscillations in the decay rate. There are no apparent indications for systematic oscillations at a level of weeks or months. Oscillations in phase with Earth's orbital distance to the sun could not be observed within 10 −5 -10 −6 range precision.

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Section: Ra Series @Jrcmentioning

confidence: 99%

On decay constants and orbital distance to the Sun—part I: alpha decay

et al. 2016

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“…124 Sb @JRC In 2007, Paepen et al[41] performed 10138 current measurements of a 124 Sb source in the IG12 IC at the JRC and took daily averages keeping only 46 values quasi-free from background and interfering signals over 221 d (A = 0.0006 (18)%, a = 281 d). A reanalysis was done taking 59 data into account covering 259 d and still showing remarkable stability (A = 0.003 (2)%, a = 241 d) in the average residuals in figure29.…”

mentioning

confidence: 99%

On decay constants and orbital distance to the Sun—part II: beta minus decay

et al. 2016

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Claims that proximity to the Sun causes variations of decay constants at the permille level have been investigated for beta-minus decaying nuclides. Repeated activity measurements of 3 H, 14 C, 60 Co, 85 Kr, 90 Sr, 124 Sb, 134 Cs, 137 Cs, and 154 Eu sources were performed over periods of 259 d up to 5 decades at various nuclear metrology institutes. Residuals from the exponential decay curves were inspected for annual oscillations. Systematic deviations from a purely exponential decay curve differ in amplitude and phase from one data set to another and appear attributable to instabilities in the instrumentation and measurement conditions. Oscillations in phase with Earth's orbital distance to the Sun could not be observed within 10 −4 -10 −5 range precision. The most stable activity measurements of β − decaying sources set an upper limit of 0.003%-0.007% to the amplitude of annual oscillations in the decay rate. There are no apparent indications for systematic oscillations at a level of weeks or months.

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“…Other nuclides, including 54 Mn, 65 Zn, 177 Lu, 109 Cd, 124 Sb, and 226 Ra, have been measured in the same IC [49][50][51][52][53]. Although these data sets are less elaborate, they also exhibit a humidity effect.…”

Section: Other Nuclidesmentioning

confidence: 99%

Ambient humidity, the overlooked influencer of radioactivity measurements

Pommé,

Stroh,

Altzitzoglou

et al. 2023

Metrologia

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When verifying the validity of the exponential-decay law through 137 precise decay rate measurement series at various nuclear laboratories, minor violations have been observed in the shape of annual cycles in the residuals with different amplitudes and phase shifts. The timing and amplitude of these deviations have been compared with local weather data and it appears that ambient humidity is highly correlated with the observed instabilities in these radioactivity measurements. In fact, when compensating the residuals for a linear relationship with absolute humidity in air, most of the annual cycles are no longer statistically significant. As a result, the validity of the exponential-decay law can now be demonstrated with even higher fidelity.

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Half-life measurement of 124Sb

Cited by 14 publications

References 12 publications

On decay constants and orbital distance to the Sun—part I: alpha decay

On decay constants and orbital distance to the Sun—part I: alpha decay

On decay constants and orbital distance to the Sun—part II: beta minus decay

Ambient humidity, the overlooked influencer of radioactivity measurements

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