Abstract
A deficiency in the implementation of current radiation protection is the determination of the ambient dose equivalent H*(10) and the directional dose equivalent H´(0.07) in pulsed radiation fields. Conventional dosimeter systems are not suitable for measurements in photon fields comprising short radiation pulses, which consequently leads to high detector loads in short time periods. Nevertheless, due to the implementation of advanced medical accelerators for cancer therapy, new medical diagnostic devices as well as various laser machining systems, there is an urgent need for suitable dosimeter systems for real time dosimetry. In this paper, a detector concept based on an organic scintillator and a full digital data analysis with the aim of developing a portable, battery powered measurement system is presented.
Highlights
Many dosimetric measurement systems are not suitable for the application in pulsed radiation fields regarding radiation protection scenarios
A promising approach for an active dosimetric system fulfilling these requirements is the combination of a fast tissue equivalent scintillation detector coupled to a full digital signal processing unit. Such a system could allow real time dosimetry by measuring the deposited energy in the detector, while a discrimination between pulsed and non-pulsed events is realized by comparing the individual time stamps of the measured events
Due to the completely non-paralyzed dead time behavior of the detection system, it is possible to correct signal losses for the respective measurement. The principle of this method, which is in detail described in [1], was implemented in an appropriate detection system based on an organic scintillator and a digital data acquisition board
Summary
Many dosimetric measurement systems are not suitable for the application in pulsed radiation fields regarding radiation protection scenarios. A promising approach for an active dosimetric system fulfilling these requirements is the combination of a fast tissue equivalent scintillation detector coupled to a full digital signal processing unit Such a system could allow real time dosimetry by measuring the deposited energy in the detector, while a discrimination between pulsed and non-pulsed events is realized by comparing the individual time stamps of the measured events. Dose rate measurements at a clinical TrueBeam therapeutic system by Varian [3] were performed, where the detector was placed outside the treatment room. For both measurements in pulsed radiation fields, it was possible to reconstruct the characteristic structure of the pulsed beam, which comprises the identification of the pulse length and repetition rate.
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