Verfahren und Vorrichtung zur Messung Hoher Dosisleistungen Ionisierender Strahlung

Details

Veröffentlichungs-Nr.

EP3567404

Aktenzeichen

EP18171669

Anmeldetag

9. Mai 2018

Veröffentlichung

11. März 2026

Erteilung

11. März 2026

Rechtsraum

EP

IPC

G01T1/02G01T1/20

Abstract

This invention is about a method for determining the dose rate Ḣ of nuclear radiation field, namely a gamma radiation field, with a radiation detection system (RDS), comprising a scintillator, a photodetector, an amplifier and a pulse measurement electronics, said pulse measurement electronics including a sampling analog to digital converter, where the nuclear radiation deposes at least some of its energy in the scintillator, thereby producing excited states in the scintillation material, said excited states decaying thereafter under emission of photons with a decay time τ, said photons being absorbed by the photodetector under emission of electrons, those electrons forming a current pulse, said current pulse being amplified so that the resulting current signal can be processed further in order to determine the charge of the pulse measured, this charge of the pulse being proportional to the energy deposed in the scintillator by the nuclear radiation, whereas the electrical signal is coupled to the pulse measurement electronics, whereas the RDS has a defined maximum permissible mean current for spectroscopic use, above which the voltage of the amplifier, defining the amplification of said amplifier, is reduced in order to prevent saturation and/or harming the amplifier through high currents, the method comprising the following steps: - if the maximum mean current is exceeded, reducing the bias voltage applied to the amplifier substantially, so that a current that is less than the maximum permissible average current flows during the measurement - digitizing and differentiating the analog detector output current signal measured by the pulse measurement electronics using a sampling period Δ producing the current samples iΔ - determining the variance of the sampled current signal Var(iΔ), - determining the mean square difference of the sampled current signal, Msd(iΔ), being a measure of the average current, - determining the mean Energy E<γ> by using the equation E γ = Var i Δ Msd i Δ - applying a non-linear correction function Z(η) to said mean Energy E<γ>, said correction function rectifying the efficiency between the scintillator and a tissue equivalent ideal scintillator, - determining the energy compensated dose rate Ḣ from current samples iΔ by using the equation Ḣ = Z(Eγ) Msd(iΔ)

Anmelder

Firmen

Rapiscan Holdings, Inc.
Target Systemelektronik GmbH & Co. KG

Land

🇺🇸 USA

Fachgebiete