Leuco crystal violet/poly(vinyl butyral) thin film as a high-dose dosimeter

A polyvinyl butyral film incorporating a radiochromic leuco crystal violet dye (LCV) and a UV-absorber of tinuvin-P has been investigated as a high-dose dosimetry for 60Co radiation processing in the dose range of 1–100 kGy. Upon γ-ray exposure, the prepared film undergoes visual color change to deep purple color characterized with an absorption band peaking at 594 nm with a shoulder around 552 nm. The response of films stored in dark place at room temperature overall a period of 55 days exhibited good stability, that the increase in response of irradiated and unirradiated films did not exceed 2% and 4%, respectively overall this storage period. The results indicate that no further protection of films from laboratory fluorescent light during the measurement of irradiated film is required. The effect of temperature and relative humidity on the performance of film during irradiation and the overall uncertainty associated with absorbed dose monitoring were investigated in the present study.

► Preparation of PVB film dosimeter incorporating a radiochromic leuco crystal violet dye for use in routine processing dosimetry.
► The dosimeter useful dose range is 1–100 kGy.
► The response is not markedly dependent on humidity during irradiation in the range of 53–75%.
► The response of unirradiated and irradiated film is good stable during storage period of 55 days.
► Overall uncertainty of the dosimeter did not exceed 7% at 2σ.