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Dosimetry for low-energy electron beam applications at Fraunhofer FEP

Tobias Teichmann
Tobias Teichmann
, 
Lotte Ligaya Schaap
Lotte Ligaya Schaap
, 
Andre Poremba
Andre Poremba
, 
Lars Dincklage
Lars Dincklage
, 
Ralf Blüthner
Ralf Blüthner
, 
Marian Sommer
Marian Sommer
, 
Jürgen Henniger
Jürgen Henniger
, 
Simone Schopf
Simone Schopf
, 
Ulla König
Ulla König
 and 
Gösta Mattausch
Gösta Mattausch
   | Jun 25, 2024
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Article Category: Original Paper
Published Online: Jun 25, 2024
Page range: 81 - 85
Received: Nov 13, 2023
Accepted: Mar 28, 2024
DOI: https://doi.org/10.2478/nuka-2024-0011
Keywords
© 2024 Tobias Teichmann et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Top: FEP’s mobile unit for seed treatment. Left: Measurement of lateral dose profiles on one of FEP’s mobile facilities for phytosanitary seed treatment. In the center, a dosimetry blade is installed. It is mounted with Risø B3 films and emulates the seed curtain processed in free fall. Right: Example dose profile which can be used to calculate the average surface dose of a falling and rotating grain.
Top: FEP’s mobile unit for seed treatment. Left: Measurement of lateral dose profiles on one of FEP’s mobile facilities for phytosanitary seed treatment. In the center, a dosimetry blade is installed. It is mounted with Risø B3 films and emulates the seed curtain processed in free fall. Right: Example dose profile which can be used to calculate the average surface dose of a falling and rotating grain.

Fig. 2.

Annular dose profile measurements in a toroidal beam source. Radiochromic film fixed on a cylindrical mount was pulled through the source. The graph shows a measured dose distribution and an ideal homogenous one.
Annular dose profile measurements in a toroidal beam source. Radiochromic film fixed on a cylindrical mount was pulled through the source. The graph shows a measured dose distribution and an ideal homogenous one.

Fig. 3.

Measurement of a depth dose distribution. Top: Stacked irradiated radiochromic film. Down: Depth dose curve of a 200 kV accelerating voltage scanned electron beam. The offset on the abscissa accounts for the titanium foil and an air gap the electrons have to pass before interacting with the dosimeter material.
Measurement of a depth dose distribution. Top: Stacked irradiated radiochromic film. Down: Depth dose curve of a 200 kV accelerating voltage scanned electron beam. The offset on the abscissa accounts for the titanium foil and an air gap the electrons have to pass before interacting with the dosimeter material.

Fig. 4.

HD-V2 dosimeters placed in Petri dishes to measure the target surface dose in a biostimulation experiment.
HD-V2 dosimeters placed in Petri dishes to measure the target surface dose in a biostimulation experiment.

Fig. 5.

Absorption spectra of B3 and HD-V2 measured with L1050.
Absorption spectra of B3 and HD-V2 measured with L1050.

Fig. 6.

Peak analysis of the absorption spectra of HD-V2 and B3.
Peak analysis of the absorption spectra of HD-V2 and B3.

Fig. 7.

The fluctuation of the zero dose signal provides information about the lowest detection limit of the method.
The fluctuation of the zero dose signal provides information about the lowest detection limit of the method.

Fig. 8.

Encapsulated beryllium oxide dosimeters (blue, red, white) in a batch of cereal seeds (large image). Blank 1 mm dosimeter (detail picture).
Encapsulated beryllium oxide dosimeters (blue, red, white) in a batch of cereal seeds (large image). Blank 1 mm dosimeter (detail picture).

Fig. 9.

Dose vs. depth distribution for electron treatment of seed. While the prescribed electron dose is deposited to the surface and across the seed shell, where it reliably inactivates pathogens, a minor tail induced by secondary X-ray photons may reach the inner of the grains.
Dose vs. depth distribution for electron treatment of seed. While the prescribed electron dose is deposited to the surface and across the seed shell, where it reliably inactivates pathogens, a minor tail induced by secondary X-ray photons may reach the inner of the grains.

Fig. 10.

X-ray dose (measured with OSL dosimeters), divided by beam current as a function of the acceleration voltage for a seed-treatment setup.
X-ray dose (measured with OSL dosimeters), divided by beam current as a function of the acceleration voltage for a seed-treatment setup.
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