Journal: Molecules

Article Title: Methods of Increasing the Performance of Radionuclide Generators Used in Nuclear Medicine: Daughter Nuclide Build-Up Optimisation, Elution-Purification-Concentration Integration, and Effective Control of Radionuclidic Purity

doi: 10.3390/molecules19067714

Figure Lengend Snippet: Detection limits of photo peaks, L D (not corrected with detector counting efficiency and gamma ray yield) evaluated from a background spectrum of blank sample measured for 36,000 s on HP Ge detector coupled ORTEC gamma-ray spectrometer.

Article Snippet: Based on the assessment method described above, the 68 Ga eluate sample of >117.55 μCi activity was justified for a reliable measurement of 68 Ge breakthrough activity after the sample decay for a time period t = 25.2 h. The measurement was performed using ORTEC gamma ray spectrometer with counting time >30 min.

Techniques:

Journal: Molecules

Article Title: Methods of Increasing the Performance of Radionuclide Generators Used in Nuclear Medicine: Daughter Nuclide Build-Up Optimisation, Elution-Purification-Concentration Integration, and Effective Control of Radionuclidic Purity

doi: 10.3390/molecules19067714

Figure Lengend Snippet: 68 Ga product samples and relevant parameters of the designed protocol for gamma ray spectrum analysis of 68 Ge impure radionuclide. Gamma ray spectrum was measured with a dead time of 1%; Detection limits measured with a blank sample; Poisson distribution 95% confidence interval, with error < 8.77% for count numbers > 500. R (%) = 100 × ( Activity of 68 Ge / ( Activity of 68 Ge + Activity of 68 Ga ).

Article Snippet: Based on the assessment method described above, the 68 Ga eluate sample of >117.55 μCi activity was justified for a reliable measurement of 68 Ge breakthrough activity after the sample decay for a time period t = 25.2 h. The measurement was performed using ORTEC gamma ray spectrometer with counting time >30 min.

Techniques: Activity Assay

Journal: Journal of Geophysical Research. Space Physics

Article Title: Statistical Study of Mercury's Energetic Electron Events as Observed by the Gamma‐Ray and Neutron Spectrometer Instrument Onboard MESSENGER

doi: 10.1029/2018JA025339

Figure Lengend Snippet: (a) Energy deposition spectra in gamma‐ray spectrometer anticoincidence shield from the event on 2 February 2014. Average energy counts for the energetic electron (EE) event and for the whole orbit without the EE event are shown in dashed red and solid blue, respectively. The trough and peak at the lowest channels (1 to 15) are due to a lower‐level discriminator cut off and noise counts in the electronics. The statistical uncertainties on these spectra are roughly a factor of 2 to 3 larger than the point‐to‐point scatter in the data. (b) The difference spectrum and the corresponding exponential fit ( y = a e − x b ) (or linear in a logarithmic scale ( y = a 1 − x b ), where a 1 = log a ) are shown in blue and red, respectively. The linear fit parameters are a 1 = 3.26 ± 0.27 and b = 11.06 ± 0.77.

Article Snippet: It was discovered early in the orbital mission that three other instruments on the MESSENGER spacecraft—the neutron spectrometer (NS), the gamma‐ray spectrometer (GRS), and the X‐ray spectrometer (XRS)—also responded to energetic electrons and provided highly sensitive, time‐resolved measurements of energetic electron bursts (Ho, Starr, et al., ).

Techniques:

Journal: Journal of Geophysical Research. Space Physics

Article Title: Statistical Study of Mercury's Energetic Electron Events as Observed by the Gamma‐Ray and Neutron Spectrometer Instrument Onboard MESSENGER

doi: 10.1029/2018JA025339

Figure Lengend Snippet: (a) Schematic view of the MESSENGER spacecraft where specific components relevant to this study are labeled including the neutron spectrometer (NS), gamma‐ray spectrometer (GRS), adapter ring, and phased array antennae. The spacecraft coordinate system is shown in the upper right, where the angle ϕ is given in the x‐y plane. ϕ = 90° represents electrons traveling in the − y axis to + y axis direction. (b) Schematic response of the NS (solid) and anticoincidence shield (ACS; dashed) as a function of ϕ angle.

Article Snippet: It was discovered early in the orbital mission that three other instruments on the MESSENGER spacecraft—the neutron spectrometer (NS), the gamma‐ray spectrometer (GRS), and the X‐ray spectrometer (XRS)—also responded to energetic electrons and provided highly sensitive, time‐resolved measurements of energetic electron bursts (Ho, Starr, et al., ).

Techniques: Labeling