Experimental study on polystyrene-MWCNT nanocomposite as a radiation dosimeter

• Published in: Radiation physics and chemistry (Oxford, England : 1993) Vol. 164; p. 108362
• Main Authors: Mosayebi, Armin, Malekie, Shahryar, Rahimi, Abbas, Ziaie, Farhood
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-11-2019; Elsevier BV
• Subjects: Bias; Dose-rate; Dosimetry; Electric potential; Electrical properties; Gamma rays; Multi wall carbon nanotubes; MWCNT-PS nanocomposite; Nanocomposites; Photoelectric effect; Photoelectric emission; Polarity; Polystyrene resins; Radiation dosage; Reproducibility; Voltage; Dosimetry; Electrical properties; MWCNT-PS nanocomposite; Dose-rate
• ISSN: 0969-806X; 1879-0895
• DOI: 10.1016/j.radphyschem.2019.108362

Polystyrene-multi-wall carbon nanotube nanocomposite samples were made through a solution processing method and investigated as a real-time dosimeter. Samples were irradiated by 60Co gamma radiation source over the dose-rate of 0.4–160 mGy/min. The current-voltage curve at the constant dose-rate of 75 mGy/min exhibited a linear response in the range of ±1000 V. Current-voltage curve showed that the sample is bias-polarity independent. Other dosimetric characteristics of this sample were accomplished under the bias voltage of 800 V. The results showed that the photocurrent in different dose-rates exhibited a higher sensitivity for the lower dose-rates region of 0.4–12 mGy/min. The maximum change in photocurrent due to angular variation within ±60° compared with incidence beam was measured as 2.8%. The maximum discrepancy of photocurrent in different field sizes was also studied. Reproducibility and repeatability of the results were within 0.4% and 1%, respectively.
•Polystyrene-MWCNT nanocomposite is fabricated via a new solution processing method.•Dosimetry characteristics of the nanocomposite are studied through its electrical behavior.•The studied dose rate range is 0.4–160 mGy/min.•The nanocomposite can be used as a real-time dosimeter at the therapy level.