Method for fast determination of the angle of ionizing radiation incidence from data measured by a Timepix3 detector

Felix Lehner,Marcus Magnor,Benedikt Bergmann,Marc Kassubeck,Jürgen Roth,Oliver Hupe,Petr Mánek

doi:10.5194/jsss-10-63-2021

Abstract

Abstract. This paper presents a method of how to determine spatial angles of ionizing radiation incidence quickly, using a Timepix3 detector. This work focuses on the dosimetric applications where detectors and measured quantities show significant angle dependencies. A determined angle of incidence can be used to correct for the angle dependence of a planar Timepix3 detector. Up until now, only passive dosemeters have been able to provide a correct dose and preserve the corresponding incidence angle of the radiation. Unfortunately, passive dosemeters cannot provide this information in “real” time. In our special setup we were able to retrieve the spatial angles with a runtime of less than 600 ms. Employing the new Timepix3 detector enables the use of effective data analysis where the direction of incident radiation is computed from a simple photon event map. In order to obtain this angle, we combine the information extracted from the map with known 3D geometry surrounding the detector. Moreover, we analyze the computation time behavior, conditions and optimizations of the developed spatial angle calculation algorithm.

Highlights

The national radiation protection regulations are all based on the European directive “council directive 2013/59/EURATOM” (European Parliament, 2013)
In this paper we describe how we use a planar photon detector in the form of a silicon semiconductor bound on a hybrid pixel detector called Timepix3 (Poikela et al, 2014) to obtain information
In this paper we presented a novel approach to the construction of solid-state dosemeters using an angle detection algorithm which converts the shadows on the detector into spatial angles and the pin construction above the detector surface, which serves as input for the algorithm

Summary

Introduction

The national radiation protection regulations are all based on the European directive “council directive 2013/59/EURATOM” (European Parliament, 2013) This basic safety standard states the required dosimetry and the dose limits. Dosemeters are used to ensure that the prescribed dose limits for occupationally exposed workers are kept and to help reveal radiation protection issues in their environment. Since the desired measurand is a body dose equivalent that relates the measured energy to the energy deposition at a certain depth in human tissue, the incident angle has an additional importance. Today, this information allowing proper transformation into the personal dose equivalent is only achieved using passive dosemeters. In this paper we describe how we use a planar photon detector in the form of a silicon semiconductor bound on a hybrid pixel detector called Timepix (Poikela et al, 2014) to obtain information

Methods

Results

Conclusion