302 Gamma-Spektroskopie - Versionsgeschichte

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Die Seite wurde neu angelegt: „'''302 Gamma-Spektroskopie''' Mit Hilfe von NaI- und Plastik-Szintillatoren, die nacheinander auf einen Photomultiplier gekittet werden, sollen die Gammaspekt…“

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'''302 Gamma-Spektroskopie'''

Mit Hilfe von NaI- und Plastik-Szintillatoren, die nacheinander auf einen Photomultiplier gekittet werden, sollen die Gammaspektren von 3 radioaktiven Quellen (137Cs, 60Co und 22Na) mit einem Pulshöhenanalysator aufgenommen werden. Dieser Vielkanalanalysator besteht aus einem Analog Digital Converter (ADC) auf einer Steckkarte für den Betrieb in einem Computer (PC) und entsprechender Software. Die Spektren können im Rechner bearbeitet und numerisch und graphisch ausgedruckt werden.. Die Eigenschaften der Verstärker werden oszillographisch untersucht und danach Hochspannung und Linearverstärker zweckmäßig eingestellt. Für jeden der beiden Szintillatoren wird eine Energiekalibrierung vorgenommen und die Eichgerade graphisch und mit Hilfe der linearen Regression ermittelt. Außerdem sollen aus den Mess- und Protokolldaten die Energieauflösung ΔE/E als Funktion der Energie E für den NaI und für den Plastik-Szintillator bestimmt und die Lichtausbeuten der beiden Szintillatoren abgeschätzt werden. Für das 137Cs Präparat soll die Aktivität A aus der Zählrate dN/dt im Photopeak mit Hilfe des Ansprechvermögens (efficiency) des NaI-Detektors und des Bruchteils des vom Detektor erfassten Raumwinkels (das Raumwinkelverhältnis) Ω/4π bestimmt werden. Zu beachten ist dabei die Übergangswahrscheinlichkeit der pro Zerfall emittierten γ-Quanten. Von den gemessenen Zählraten ist der Nulleffekt zu subtrahieren. (Man vergleiche dazu das Experiment Nr. 301 Absoluteichung eines Gamma-Detektors)

[http://f-praktikum.ep1.ruhr-uni-bochum.de/anleitung/Vers302.pdf Anleitung]

← Nächstältere Version		Version vom 16. April 2024, 14:55 Uhr
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	The gamma spectra of 3 radioactive sources (<sup>137</sup>Cs, <sup>60</sup>Co und <sup>22</sup>Na) are to be recorded with a pulse height analyzer using NaI and plastic scintillators, which are cemented one after the other to a photomultiplier. This multi-channel analyzer consists of an analog digital converter (ADC) on a plug-in card for operation in a computer (PC) and the appropriate software. The spectra can be processed on the computer and printed out numerically and graphically. The properties of the amplifiers are examined by oscillography and then the high voltage and linear amplifiers are set appropriately. An energy calibration is carried out for each of the two scintillators and the calibration line is determined graphically and with the help of linear regression. In addition, the energy resolution ΔE/E as a function of the energy E for the NaI and for the plastic scintillator should be determined from the measurement and protocol data and the light yields of the two scintillators should be estimated. For the 137Cs preparation, the activity A is to be determined from the count rate dN/dt in the photopeak using the efficiency of the NaI detector and the fraction of the solid angle detected by the detector (the solid angle ratio) Ω/4π. The transition probability of the γ quanta emitted per decay must be taken into account. The background has to be subtracted from the measured count rates. (Compare experiment no. 301 absolute calibration of a gamma detector)		The gamma spectra of 3 radioactive sources (<sup>137</sup>Cs, <sup>60</sup>Co und <sup>22</sup>Na) are to be recorded with a pulse height analyzer using NaI and plastic scintillators, which are cemented one after the other to a photomultiplier. This multi-channel analyzer consists of an analog digital converter (ADC) on a plug-in card for operation in a computer (PC) and the appropriate software. The spectra can be processed on the computer and printed out numerically and graphically. The properties of the amplifiers are examined by oscillography and then the high voltage and linear amplifiers are set appropriately. An energy calibration is carried out for each of the two scintillators and the calibration line is determined graphically and with the help of linear regression. In addition, the energy resolution ΔE/E as a function of the energy E for the NaI and for the plastic scintillator should be determined from the measurement and protocol data and the light yields of the two scintillators should be estimated. For the 137Cs preparation, the activity A is to be determined from the count rate dN/dt in the photopeak using the efficiency of the NaI detector and the fraction of the solid angle detected by the detector (the solid angle ratio) Ω/4π. The transition probability of the γ quanta emitted per decay must be taken into account. The background has to be subtracted from the measured count rates. (Compare experiment no. 301 absolute calibration of a gamma detector)
		+
		+	[http://f-praktikum.ep1.ruhr-uni-bochum.de/anleitung/Vers302_en.pdf Manual]

← Nächstältere Version		Version vom 9. Dezember 2022, 10:51 Uhr
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	'''302 Gamma Spectroscopy'''		'''302 Gamma Spectroscopy'''

−	The gamma spectra of 3 radioactive sources (~~137Cs~~, ~~60Co and 22Na~~) are to be recorded with a pulse height analyzer using NaI and plastic scintillators, which are cemented one after the other to a photomultiplier. This multi-channel analyzer consists of an analog digital converter (ADC) on a plug-in card for operation in a computer (PC) and the appropriate software. The spectra can be processed on the computer and printed out numerically and graphically. The properties of the amplifiers are examined by oscillography and then the high voltage and linear amplifiers are set appropriately. An energy calibration is carried out for each of the two scintillators and the calibration line is determined graphically and with the help of linear regression. In addition, the energy resolution ΔE/E as a function of the energy E for the NaI and for the plastic scintillator should be determined from the measurement and protocol data and the light yields of the two scintillators should be estimated. For the 137Cs preparation, the activity A is to be determined from the count rate dN/dt in the photopeak using the efficiency of the NaI detector and the fraction of the solid angle detected by the detector (the solid angle ratio) Ω/4π. The transition probability of the γ quanta emitted per decay must be taken into account. The background has to be subtracted from the measured count rates. (Compare experiment no. 301 absolute calibration of a gamma detector)	+	The gamma spectra of 3 radioactive sources (<sup>137</sup>Cs, <sup>60</sup>Co und <sup>22</sup>Na) are to be recorded with a pulse height analyzer using NaI and plastic scintillators, which are cemented one after the other to a photomultiplier. This multi-channel analyzer consists of an analog digital converter (ADC) on a plug-in card for operation in a computer (PC) and the appropriate software. The spectra can be processed on the computer and printed out numerically and graphically. The properties of the amplifiers are examined by oscillography and then the high voltage and linear amplifiers are set appropriately. An energy calibration is carried out for each of the two scintillators and the calibration line is determined graphically and with the help of linear regression. In addition, the energy resolution ΔE/E as a function of the energy E for the NaI and for the plastic scintillator should be determined from the measurement and protocol data and the light yields of the two scintillators should be estimated. For the 137Cs preparation, the activity A is to be determined from the count rate dN/dt in the photopeak using the efficiency of the NaI detector and the fraction of the solid angle detected by the detector (the solid angle ratio) Ω/4π. The transition probability of the γ quanta emitted per decay must be taken into account. The background has to be subtracted from the measured count rates. (Compare experiment no. 301 absolute calibration of a gamma detector)

← Nächstältere Version		Version vom 9. Dezember 2022, 10:50 Uhr
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	[http://f-praktikum.ep1.ruhr-uni-bochum.de/anleitung/Vers302.pdf Anleitung]		[http://f-praktikum.ep1.ruhr-uni-bochum.de/anleitung/Vers302.pdf Anleitung]
		+
		+	'''302 Gamma Spectroscopy'''
		+
		+	The gamma spectra of 3 radioactive sources (137Cs, 60Co and 22Na) are to be recorded with a pulse height analyzer using NaI and plastic scintillators, which are cemented one after the other to a photomultiplier. This multi-channel analyzer consists of an analog digital converter (ADC) on a plug-in card for operation in a computer (PC) and the appropriate software. The spectra can be processed on the computer and printed out numerically and graphically. The properties of the amplifiers are examined by oscillography and then the high voltage and linear amplifiers are set appropriately. An energy calibration is carried out for each of the two scintillators and the calibration line is determined graphically and with the help of linear regression. In addition, the energy resolution ΔE/E as a function of the energy E for the NaI and for the plastic scintillator should be determined from the measurement and protocol data and the light yields of the two scintillators should be estimated. For the 137Cs preparation, the activity A is to be determined from the count rate dN/dt in the photopeak using the efficiency of the NaI detector and the fraction of the solid angle detected by the detector (the solid angle ratio) Ω/4π. The transition probability of the γ quanta emitted per decay must be taken into account. The background has to be subtracted from the measured count rates. (Compare experiment no. 301 absolute calibration of a gamma detector)