Decay data evaluation project (DDEP): Updated evaluations of the 233Th and 241Am decay characteristics

Chechev, V. P.; Kuzmenko, N. K.

doi:10.1016/j.apradiso.2009.11.032

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…They are intense and strongly converted and are responsible for 98% of the emitted L x-rays by the 237 Np daughter. The recommended value of the total L-x-ray emission intensity is 37.66 (17) per 100 decays [21].…”

Section: The Need For Two Sourcesmentioning

confidence: 99%

“…Americium-241 was chosen because it is one of the best known α-emitting radionuclides, commonly used as a calibration source below 100 keV in the metrology of ionizing radiation and in many other applications [2]. On the one hand, this allows the present results to be compared with the most precise measurements of PEIs below 100 keV [21], and on the other hand, this allows disseminating accurate and reliable PEIs to end users for the efficiency calibration of their spectrometers with 241 Am sources. Furthermore, the resolution of SMX3 is a very important asset in this case because it can separate the tens of x-ray lines, and provide as many PEIs, which is not possible with semiconductor detectors.…”

Section: Introductionmentioning

confidence: 99%

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Determination of absolute Np L x-ray emission intensities from ²⁴¹Am decay using a metallic magnetic calorimeter

Rodrigues¹,

Loidl²,

Pierre³

2023

Metrologia

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Photon emission intensities of radionuclides, i.e. the number of emitted photons per decay, are the single most important decay data when the photon spectrometry technique is employed in ionizing radiation metrology. However, their precise measurement is problematic because they are usually determined by photon spectrometry with spectrometers having a detection efficiency calibrated with X-ray and γ-ray emission intensities from other radionuclides. Therefore, these intensities are ultimately interdependent and correlated to some extent. A novel method was applied to determine the photon intensities of α-emitting radionuclides by measuring the ratio between the rate of photons in the full energy peaks and the rate of detected α-particles with the same detection set-up. Thus, there is no need to calibrate the detection efficiency and to standardize calibration sources by primary methods. The main condition to reach low uncertainties is to have a spectrometer with an intrinsic detection efficiency close to unity for the measured photons and α-particles. This condition was fulfilled by a metallic magnetic calorimeter (MMC) with an intrinsic efficiency of around 99% between 5 and 25 keV. In addition, the MMC provides an ultra-high energy resolution of 28 eV (full width at half maximum), facilitating the processing of the spectrum. The method was applied to determine L X-ray emission intensities from the decay of 241Am(α) → 237Np emitted between 11.9 keV and 22.4 keV. A total L X-ray emission intensity of 37.90 (12) per 100 disintegrations was obtained; the value agrees well with previous measurements and has a lower uncertainty. The uncertainties of the L X-ray groups Lα, Lηβ and Lγ were improved by a factor of two. Moreover, due to the high-energy resolution of 28 eV, a detailed set of 33 L X-ray emission intensities are provided.

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Section: The Need For Two Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of absolute Np L x-ray emission intensities from ²⁴¹Am decay using a metallic magnetic calorimeter

Rodrigues¹,

Loidl²,

Pierre³

2023

Metrologia

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“…An example of how a possible 'non-statistical' (Type B) component has been taken into account is the set of twelve measurement results available to be considered in the evaluation for the absolute 59.54 keV gamma-ray emission intensity in the 241 Am decay [17,18]. The values published in 1952, 1964 and 1965 were found to be outliers by the statistical techniques described in section 2.…”

Section: 'Non-statistical' Uncertainty Component Assessmentmentioning

confidence: 99%

Uncertainties in nuclear decay data evaluations

Bé¹,

Chechev²,

Pearce³

2015

Metrologia

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Over the years, scientists have compiled and evaluated experimental results and combined these with theoretical studies with the goal of obtaining the best values, and their uncertainties, for the quantities related to radioactive decay. To meet the demand, an international group, the Decay Data Evaluation Project, was organised in 1995. The methodology adopted by this group is detailed. Some examples are given explaining how the final uncertainties are assessed from the experimental results and their uncertainties.

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“…Table 1 lists the energies of the L X-rays emitted from 238 Pu, 241 Am, and 244 Cm, which are representative transuranium (TRU) elements. For these L X-rays, accurate spectrum measurement is of significant interest for basic decay data evaluation [1], nuclear safeguarding [2], and intake exposure evaluation [3] because it can provide non-destructive elemental information. In general, the L X-ray spectrum is measured by a high-purity germanium (HPGe) detector or a silicon-lithium detector.…”

Section: Introductionmentioning

confidence: 99%

Development of a microcalorimeter for measurement of L X-rays emitted from transuranium elements

Nakamura

Maeda

Maehata

et al. 2014

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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We fabricated a transition-edge sensor (TES) microcalorimeter for spectroscopic measurements of L X-rays emitted by transuranium (TRU) elements. A Pu L X-ray energy spectrum was obtained by irradiation with L X-rays emitted by a 244 Cm source to the TES microcalorimeter. The energy resolution was evaluated to be 64 eV at the full width at half maximum (FWHM) for L X-rays at 14.28 keV. The obtained L X-ray spectrum indicated that the TES microcalorimeter made it possible to distinguish between the L X-ray lines of TRU elements.

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Decay data evaluation project (DDEP): Updated evaluations of the 233Th and 241Am decay characteristics

Cited by 10 publications

References 37 publications

Determination of absolute Np L x-ray emission intensities from ²⁴¹Am decay using a metallic magnetic calorimeter

Determination of absolute Np L x-ray emission intensities from ²⁴¹Am decay using a metallic magnetic calorimeter

Uncertainties in nuclear decay data evaluations

Development of a microcalorimeter for measurement of L X-rays emitted from transuranium elements

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Decay data evaluation project (DDEP): Updated evaluations of the 233Th and 241Am decay characteristics

Cited by 10 publications

References 37 publications

Determination of absolute Np L x-ray emission intensities from 241Am decay using a metallic magnetic calorimeter

Determination of absolute Np L x-ray emission intensities from 241Am decay using a metallic magnetic calorimeter

Uncertainties in nuclear decay data evaluations

Development of a microcalorimeter for measurement of L X-rays emitted from transuranium elements

Contact Info

Product

Resources

About

Determination of absolute Np L x-ray emission intensities from ²⁴¹Am decay using a metallic magnetic calorimeter

Determination of absolute Np L x-ray emission intensities from ²⁴¹Am decay using a metallic magnetic calorimeter