Measurement of 241Am L X-ray emission probabilities

Lépy, Marie‐Christine; Plagnard, J.; Ferreux, L.

doi:10.1016/j.apradiso.2008.02.078

Cited by 38 publications

(29 citation statements)

References 8 publications

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“…However, significant discrepancies exist between theoretical values and experimental data regarding L X-ray emission intensities for Np-and U-isotopes, because of spectral resolution difficulties using semiconductor detectors, as evident from Fig. 1 [2,3]. This issue is addressed with TES microcalorimetry.…”

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confidence: 92%

“…Figure 1 shows experimental energy spectrum of L X-ray (dashed lines) for 237 Np of residual nucleus resulting from α-decay of 241 Am, and for 235 U a residual nucleus resulting from α decay of 239 Pu. Both spectra were measured by conventional semiconductor detectors; theoretical calculations (solid lines) are also presented [2]. Because of a lack in energy resolution, discerning all L X-ray peaks is impossible.…”

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confidence: 99%

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Spectroscopic Measurement of L X-Rays Emitted by 241Am Source by TES Microcalorimeter

et al. 2012

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Nondestructive plutonium monitoring during reprocessing of spent nuclear fuel and in mixed-oxide-fuel fabrication facilities is expected to require spectroscopic measurements of L X-rays ranging from 10 to 20 keV. To this end, L X-ray emission intensities of transuranium elements will be important parameters in estimating the plutonium isotopic composition from L X-ray spectra. However, owing to fine structure within the L X-ray spectra, significant discrepancies exist among theoretical values, reference and experimental data concerning these emission intensities. To obtain better spectroscopic measurements, we used a TES microcalorimeter to get the energy spectrum of L X-rays emitted by 237 Np resulting from α-decay of a 241 Am source. Values for the L X-ray emission intensities were estimated by analyzing the spectral data and compared with previous data. We advocate for improvements in evaluation of emission intensities given the enhanced precision afforded by TES microcalorimetry. J Low Temp Phys (2012) 167:754-758 755 Fig. 1 L X-ray energy spectra for 237 Np (a) and 235 U (b) measured by a semiconductor detector. Dashed lines indicate experimental results, solid lines are derived from theoretical calculations

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confidence: 92%

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Spectroscopic Measurement of L X-Rays Emitted by 241Am Source by TES Microcalorimeter

et al. 2012

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“…The photon beam reached the detector window under a normal angle of incidence. The efficiency calibration was provided by means of a removable proportional counter that was used to determine the incident photon flux [2][3][4]. The proportional counter (PC) included a polymer window and an absorption gas volume (Ar-CH 4 ).…”

Section: Efficiency Calibration Using Monochromatic Beammentioning

confidence: 99%

Use of tunable monochromatic X-ray sources for metrological studies in the low-energy range at the Laboratoire National Henri Becquerel

Plagnard

Lépy

2007

Nd2007

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Abstract. In the frame of the French Metrology Institute, the Laboratoire National Henri Becquerel (LNHB) performs accurate measurements of photon emission intensities in order to improve the knowledge of radionuclides decay scheme. This is achieved using semiconductor detectors, however, in the low-energy range (E < 20 keV) their efficiency calibration is not straightforward. Moreover, their energy resolution and the detailed shape of their response function are parameters of interest for accurate processing of low-energy X-ray spectra. For these purposes, and in complement to the use of classical calibration method using standard radionuclides, an original method for detectors characterization have been developed using tunable monochromatic radiation. The tunable radiation makes possible examining and identifying the different features of X-ray spectra by fine scanning at the binding energies of the detector materials, thus improving the knowledge of the detector response function and the subsequent processing of complex X-ray spectra. Since 2001, the SOLEX source (Source Of Low Energy X-rays) has been installed at LNHB and provides tunable monochromatic radiation in the 1-20 keV energy range. This facility has been applied to the measurement of photon emission intensities and attenuation coefficients of materials (Al, Cu) in the low-energy range. In the next future, the SOLEIL synchrotron facility will be equipped with a metrology beam line that will be partially managed by LNHB: this will allow subsequent development of such metrological studies with enhanced performances.

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“…Figure 1(a) and (b) show an experimental energy spectrum of L X-rays emitted by 237 Np progeny resulting from the α decay of 241 Am and that by 235 U progeny resulting from the α decay of 239 Pu, respectively by dashed lines. Solid lines indicate theoretical emission probability of corresponding L X-ray lines [2], [3]. As shown in Fig.…”

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confidence: 99%

“…However, we could not evaluate the energy resolution for peaks in the energy spectra of L X-rays emitted by 238 Pu and 239 Pu sources because of insufficient statistics. Then spectroscopic measurements of L X-rays emitted from 241 Am, 238 Pu and 239 Pu sources has been conducted over sufficient time period by operating an improved TES microcalorimeter with the sensitive area of 150 × 150 µm 2 , and values of the full width at half maximum of L X-ray peaks in the experimental energy spectra have been obtained to be 60.9 eV at 17.751 keV for 241 Am source, 62.5 eV at 17.222 keV for 238 Pu source and 62.6 eV at 17.222 keV for 239 Pu source [7]. Although separation of 241 Am and plutonium isotopes by L X-ray spectroscopy was demonstrated by using the TES microcalorimeter, the sensitive area of the TES microcalorimeter was insufficient for practical use.…”

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confidence: 99%

Response of a Superconducting Transition-Edge Sensor Microcalorimeter with a Mushroom-shaped Absorber to L X-rays Emitted by Transuranium Elements

Maehata

Maeda

Iyomoto

et al. 2015

IEICE Trans. Electron.

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SUMMARY A four-pixel-array superconducting transition-edge sensor (TES) microcalorimeter with a mushroom-shaped absorber was fabricated for the energy dispersive spectroscopy performed on a transmission electron microscope. The TES consists of a bilayer of Au/Ti with either a 50-nm or 120-nm thickness. The absorber of 5.0 µm thick is made from a Au layer and its stem is deposited in the center of the TES surface. A Ta 2 O 5 insulating layer of 100-nm thickness is inserted between the overhang region of the absorber and the TES surface. A selected pixel of the TES microcalorimeter was operated for the detection of Np L X-rays emitted from an 241 Am source. A response of the TES microcalorimeter to L X-rays was obtained by analyzing detection signal pulses with using the optimal filter method. An energy resolution was obtained to be 33 eV of the full width at half maximum value at 17.751 keV of Np L β1 considering its natural width of 13.4 eV. Response to L X-rays emitted from a mixture source of 238 Pu, 239 Pu and 241 Am was obtained by operating the selected pixel of the TES microcalorimeter. Major L X-ray peaks of progeny elements of α decay of Pu and Am isotopes were clearly identified in the obtained energy spectrum. The experimental results demonstrated the separation of 241 Am and plutonium isotopes by L X-ray spectroscopy. key words: TES microcalorimeter, Mushroom shaped absorber, X-ray response, Energy Resolution, L X-ray spectroscopy

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Measurement of 241Am L X-ray emission probabilities

Cited by 38 publications

References 8 publications

Spectroscopic Measurement of L X-Rays Emitted by 241Am Source by TES Microcalorimeter

Spectroscopic Measurement of L X-Rays Emitted by 241Am Source by TES Microcalorimeter

Use of tunable monochromatic X-ray sources for metrological studies in the low-energy range at the Laboratoire National Henri Becquerel

Response of a Superconducting Transition-Edge Sensor Microcalorimeter with a Mushroom-shaped Absorber to L X-rays Emitted by Transuranium Elements

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