Improved performance in germanium detector gamma-spectrometers based on digital signal processing

Keyser, Ronald M.; Bingham, Russell D.; Twomey, Timothy R.

doi:10.1007/s10967-008-0601-2

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…The detector viewing a source from a distance of 45 cm will require approximately 13.2 cm of lead shielding to reduce the count rate of the 661 keV γ-ray to acceptable levels, which for this example we have conservatively limited to 10 4 cps [17]. The three different contributions to the photon fluences at the detector location calculated as discussed above are shown in figure 5 …”

Section: B Industrial Radiatormentioning

confidence: 99%

Nuclear resonance fluorescence for materials assay

Quiter

Ludewigt

Mozin

et al. 2009

2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

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Abstract-This paper discusses the use of nuclear resonance fluorescence (NRF) techniques for the isotopic and quantitative assaying of radioactive material. Potential applications include age-dating of an unknown radioactive source, pre-and postdetonation nuclear forensics, and safeguards for nuclear fuel cycles Examples of age-dating a strong radioactive source and assaying a spent fuel pin are discussed. The modeling work has ben performed with the Monte Carlo radiation transport computer code MCNPX, and the capability to simulate NRF has bee added to the code. Discussed are the limitations in MCNPX's photon transport physics for accurately describing photon scattering processes that are important contributions to the background and impact the applicability of the NRF assay technique.

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Section: B Industrial Radiatormentioning

confidence: 99%

Nuclear resonance fluorescence for materials assay

Quiter

Ludewigt

Mozin

et al. 2009

2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

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“…There are: the applying of band pass filters in input circuits of preamplifier together with selection of the shortest shaping time or input circuits with two shaping times. In some case the digital filters in subsequent blocks of spectrometric signal processing are applied [1][2][3]. To further reducing of microphone effect, more complicated for practical implementation methods of active vibration cancellation are used [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Malgin¹,

Jakovļevs²,

Vība³

2019

Vib. proced.

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The cryostat of gamma-ray spectrometer with HPGe detector cooled by Stirling cycle cryocooler is under consideration. The natural frequencies and modes shapes for components involved to oscillatory systems distinguished in dynamic model of cryostat were calculated by Solidworks simulation. The results obtained for the gamma-ray spectrometer "Monolith" produced by BSI, represent its specific modal portrait and allow identification the components of electrical noise due to microphone effect. The absence of resonant amplification due to coincidence between the harmonics of cryocooler operating frequency and the natural frequencies of the cryostat components is an important condition for reducing the influence of microphonics. The results obtained by modal analysis are also useful for assessing the influence of external mechanical disturbances, such as shocks, external vibration or audible noise.

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“…In its turn the changes of the capacitances in input circuits of the preamplifier cause electrical interference. This microphone effect (the conversion of mechanical vibrations into electrical signals) reduces the final resolution of spectrometer [1][2][3][4][5][6][7]. Usually, to reduce the influence of microphone effect, the electronic methods are used.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that electronic methods mentioned above do not provide a sufficient suppression of the microphone effect at the present time. To further reducing of microphone effect, more complicated for practical implementation methods of active vibration cancellation are used [4,5].…”

Section: Introductionmentioning

confidence: 99%

Modal analysis of HPGe detector assembly in gamma-ray spectrometers

Jakovļevs¹,

Malgin²,

Vība³

2017

Vib. proced.

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Abstract. The HPGe detector assembly of gamma-ray spectrometer cooled by Stirling cycle cryocooler is under consideration. Modal analysis based on the compiled dynamic model was carried out. The natural frequencies and modes shapes for HPGe detector with relative efficiency 15 % mounted by supports made from composite G-Etronax and CESTILENE HD 1000 were calculated by Solidworks simulation. The frequencies of the axial mode are in range of 200-600 Hz where electrical interferences caused by mechanical vibrations (so-called microphone noise) has a large impact on the resolution of spectrometer. It is shown that for cryostat cap the lowest natural frequencies determined by the thickness of input window lay in higher frequency range. The validity of the adopted model was confirmed by the experiments. The calculated natural frequencies of the detector assembly are compared to the harmonics of cryocooler's vibration. The results obtained are useful to identify the interferences source in electrical circuits of spectrometer at its adjusting.

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Improved performance in germanium detector gamma-spectrometers based on digital signal processing

Cited by 8 publications

References 2 publications

Nuclear resonance fluorescence for materials assay

Nuclear resonance fluorescence for materials assay

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Modal analysis of HPGe detector assembly in gamma-ray spectrometers

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