Vliv energetického rozložení spektra radionuklidů na časovou rozlišovací schopnost scintilačních spektrometrů

• Main Author: Chromá, Ladislava
• Other Authors: Zimák, Jaroslav
• Format: Dissertation
• Language: Czech
• Published: 2010
• Online Access: http://www.nusl.cz/ntk/nusl-282572

Every radiation counting system exhibits a characteristic pulse resolving time (dead time) that is related to the time required to individual detected events. In case that a second pulse occures before the first has disappeared the two pulses will form a single distored pulse. Because of dead time losses, the measured counting rate (cps) is less than the true (teoretical) counting rate. Pulse resolving time can considerably change the relationship in case of measuring small and high activities. According to experimental results in my work dead time losses are dependant on the scintillators type, time constant of pulse amplifier and energy of radionuklides. There are given counting rate limits for three radionuklides - 99mTc, 51Cr and 131I and two scintillation spectrometers - JKA 300 and JKA1102.