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<p>Phytosanitary irradiation using 10&#xa0;MeV electron beams is a vital quarantine treatment for dragon fruit exports. However, the fruit’s ellipsoidal morphology poses significant dosimetric challenges. This study evaluates 10&#xa0;MeV electron dose penetration in dragon fruit by benchmarking idealized Monte Carlo simulations against experimental alanine dosimetry. To isolate fundamental electron transport, simulations employed a simplified, homogeneous water-equivalent model across nine size variations (300–400&#xa0;g), utilizing a static data-flip methodology for double-sided irradiation. The simulated scanning horn model was verified using Riso Aluminum Wedge data, yielding a 2.55% mean deviation. Results demonstrated that the double-sided configuration produced uniform dose distributions with Dose Uniformity Ratio of 1.24 ± 0.05, satisfying the ISO/ASTM 51649 regulatory limit. The average minimum dose (380.97 ± 12.22&#xa0;Gy) approached the 400&#xa0;Gy threshold required for <i>Bactrocera dorsalis</i> inactivation. Statistical analysis revealed excellent agreement at the geometric center (10.52% deviation, <i>p</i> = 0.1513). Conversely, a systematic dose underestimation of 30–34% (<i>p</i> &lt; 0.001) occurred at the fruit surfaces. This discrepancy highlights that idealized homogeneous models fail to capture amplified electron backscattering at complex air-tissue interfaces. Consequently, future computational dosimetry must incorporate voxelized anatomical features to accurately map surface interactions.</p>

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Dose penetration in dragon fruit using 10 MeV electron beam machine: experimental vs Monte Carlo

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Ibrahim,
  • Afdhal Muttaqin,
  • Bimo Saputro,
  • Okky Agassy Firmansyah,
  • Fendinugroho,
  • Murni Indarwatmi,
  • Indah Arastuti Nasution,
  • Nunung Nuraeni

摘要

Phytosanitary irradiation using 10 MeV electron beams is a vital quarantine treatment for dragon fruit exports. However, the fruit’s ellipsoidal morphology poses significant dosimetric challenges. This study evaluates 10 MeV electron dose penetration in dragon fruit by benchmarking idealized Monte Carlo simulations against experimental alanine dosimetry. To isolate fundamental electron transport, simulations employed a simplified, homogeneous water-equivalent model across nine size variations (300–400 g), utilizing a static data-flip methodology for double-sided irradiation. The simulated scanning horn model was verified using Riso Aluminum Wedge data, yielding a 2.55% mean deviation. Results demonstrated that the double-sided configuration produced uniform dose distributions with Dose Uniformity Ratio of 1.24 ± 0.05, satisfying the ISO/ASTM 51649 regulatory limit. The average minimum dose (380.97 ± 12.22 Gy) approached the 400 Gy threshold required for Bactrocera dorsalis inactivation. Statistical analysis revealed excellent agreement at the geometric center (10.52% deviation, p = 0.1513). Conversely, a systematic dose underestimation of 30–34% (p < 0.001) occurred at the fruit surfaces. This discrepancy highlights that idealized homogeneous models fail to capture amplified electron backscattering at complex air-tissue interfaces. Consequently, future computational dosimetry must incorporate voxelized anatomical features to accurately map surface interactions.