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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS · 2013 · IF 1.266

Radiation stability of SiO2 micro- and nanopowders under electron and proton exposure

Chundong Li,M.M. Mikhailov,V.V. Neshchimenko

The effects of proton and electron ( E = 100 keV, F = 5 × 10 15 сm −2 ) exposure on the reflective spectra of SiO 2 micro- and nanopowders in wavelength range from 250 to 2500 nm have been investigated. It has been established that the reflectance and radiation stability of nanopowders is less than that of micropowders. This effect is caused by the high concentration of radiation defects, which act as surface absorption centers ( E s ′ centers) near the energies 5.47 and 4.45 eV, and peroxide silicon defects ( Si O O Si ) near the energy 3.84 eV.

CAS / MDL: 7631-86-9 112945-52-5 60676-86-0

研究领域: 材料科学 · 辐射物理学

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT · 2025 · IF 1.4

Determination of topographical radiation dose distribution of high-dose low-energy proton beam via processing digital image of photonic crystal films

Long-fei An,Ling-hua Zheng,Yan-hong Chen,Ming-shuo Tang,Yan-shi Zhang,Liang-wen Chen,Yun-long Wang,Rui Cheng,Jie Yang,Lei Yang

The precise determination of 2D dose distribution at high doses and convenient dose measurement methods are ongoing challenges in the study of beam diagnosis on large-scale scientific devices. The current work offers an impressive solution by integrating PEGDA photonic crystal films with HSB (Hue, Saturation, Brightness) image processing technology. Under irradiation by a proton beam with a low energy of 182.5 keV, the dose dependence of the radiochromic properties of PEGDA films was confirmed in the experiment. Low-energy protons can alter the microstructure of PEGDA films during energy deposition, reducing the characteristic distance and decreasing the diffraction center wavelength. Under irradiation by proton beams with high doses from 1 MGy to 17.6 MGy (on average), the PEGDA films exhibited a significant blue shift in color phase, with a clear linear relationship between wavelength and absorbed dose. This study offers a straightforward and effective real-time dose feedback analysis method compared to traditional radiochromic readout systems. This approach, which is based on visual observation and digital image analysis, could provide a precise assessment of dose distribution through intuitive image interpretation. In summary, this work introduces a direct and effective dosimeter along with a simple and rapid method for dose readout, offering valuable validation for beam diagnosis.

CAS / MDL: 6175-45-7

研究领域: 辐射生物学 · 医学物理

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Radiation stability of SiO2 micro- and nanopowders under electron and proton exposure

Determination of topographical radiation dose distribution of high-dose low-energy proton beam via processing digital image of photonic crystal films