Measurement of relative depth-dose distribution in radiochromic film dosimeters irradiated with 43–70 keV electron beam for industrial application. (May 2018)

• Record Type: Journal Article
• Authors: Matsui, Shinjiro; Hattori, Takeaki; Nonaka, Takashi; Watanabe, Yuki; Morita, Ippei; Kondo, Junichi; Ishikawa, Masayoshi; Mori, Yoshitaka
• Is Part Of: Radiation physics and chemistry. Volume 146(2018:May)
• Page Start: 91
• Page End: 95
• Publication Date: 2018-05
• Subjects: Ultra-low energy electron-beam -- Radiochromic film -- PENELOPE; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2018.01.006
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: The relative dose in a layer, which is thinner than the thickness of the dosimeter is evaluated using simulated depth-dose distributions, and the measured responses of dosimeters with acceleration voltages from 43 to 70 kV, via ultra-low-energy electron beam (ULEB) irradiation. By stacking thin film dosimeters, we confirmed that the simulated depth-dose distributions coincided with the measured depth-dose curve within the measurement uncertainty ( k = 2 ). Using the measurement dose of the 47 μm dosimeter and the simulated depth-dose distribution, the dose of 11 μm dosimeters in the surface was evaluated within the measurement uncertainty ( k = 2 ). We also verified the effectiveness of this method for a thinner layer by changing the acceleration voltage of the irradiation source. We evaluated the relative dose for an adjusted depth of energy deposition from 4.4 μm to 22.8 μm. As a result, this method was found to be effective for a thickness, which is less than the thickness of the dosimeter. When irradiation conditions are well known with accuracy, using the confirmed relative depth-dose distributions across any dosimeter thickness range, a dose evaluation, in several μm steps will possibly improve the design of industrial ULEB processes. Abstract : Highlights: A method for a relative dose estimation in industrial ULEB process is proposed. The simulated depth-dose curve is effective for a dose evaluation. This method is confirmed within the energy deposit range of 4.4 µm or more. This method works if irradiation conditions are known with accuracy.