Pulse height spectra

Nal Scsn illation Detector Pulse Height Spectrum of an Aluminum Suitcase... 

The true energy scale of the y-spectrum in units of keV usually cannot be derived directly from the pulse height spectrum because the overall amplification of the detection system is not known. Therefore, the y-lines eventually have to be identified by trial and error when a new system is set up by checking for the occurrence of the Mossbauer effect. 

Figure 3. Pulse height spectrum of gamma radiations. Window of single channel analyzer fixed to optimize intensity of 14.4-k,e,v, radiation...

These are amplified and sent to a pulse height analyzer which sorts out the pulses and displays a pulse height spectrum. A particular gamma ray shows up as a fairly sharp peak in this pulse height distribution. 

Fig. 3.10 (a) Schematic of a He gas tube and (b) idealised pulse height spectrum from a He gas tube. 

Figure 16 shows a pulse height spectrum recorded in an ion-implanted-silicon surface barrier detector mounted in the zero degree direction of the electron cooler in CRYRING. A stored beam of 4.4 MeV D30" ions interacts with a beam of velocity matched electrons, thus the collision energy... 

Figure 16, Pulse height spectrum recorded at the CRYRING with a 4.4 MeV stored beam of 030 ions and the electron cooler set to the velocity-matching condition. The peak at 4.4 MeV, corresponding to particles with a combined mass of 22 amu, originates from dissociative recombination, whereas the six other peaks are due to collisions of 030 with rest gas molecules. (Reproduced with permission from Ref. [116].)...

Figure 12.4 The pulse height spectrum obtained from the source spectrum of Fig. 12.3, in the absence of statistical effects in the detector (perfect energy resolution).

Figure 12.20 Gamma-ray pulse height spectrum produced by NE 213 for a Na source. The two Compton edges are due to the 1.37-and 0.75-MeV gammas (from Ref. 7).

Figure 14.5 An integral pulse-height spectrum taken with a fission counter.

Fig. 4. Dashed line pulse-height spectrum continuous line corrected spectrum. The spectra are magnified by 25 after channel 250.

Fig. 4. Final pulse-height spectrum for the hybrid detector...

Figure 4.6 Pulse shapes encountered with a NaI(Tl) detector and spectrometer electronics. The detector is responding to the 22-keV silver K lines from a radioactive ° Cd source and the 6-keV Mn K lines from a radioactive Fe source, (a) The preamplifier output pulses, (b) Output pulses from a delay-line clipped pulse-shaping amplifier with a 1-/Ltsec delay line clip and a l/4-)US integration time constant, (c) Output pulses from the alternative semigaussian shaping amplifier with a 0.5-fxs time constant, (a), (b), and (c) are multiple traces on an oscilloscope, (d) The energy (pulse height) spectrum obtained by analyzing the delay line amplifier output on a multichannel pulse height analyzer. (Reprinted by courtesy of EG G ORTEC.)...

An identical process occurs in the NaI(Tl) detector, except that it is the escape of the iodine x-ray that is important. This is most noticeable with the iodine K x-rays. The K absorption edge occurs at 0 = 33.164 keV. Consequently, x-ray photons with wavelengths less than 0.3738 A will yield an escape peak in the pulse height spectrum approximately 29 keV lower in energy than the true photon energy. 

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