Polymer-based triphenyl tetrazolium chloride films for ultraviolet radiation monitoring

Ebraheem, S.; Abdel-Fattah, A.A.; Said, F.; Ali, Zain

doi:10.1016/s0969-806x(99)00352-7

Cited by 21 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The estimated dose from the above relationship, to be signi icant, a measurement of absorbance and dose estimation shall be accompanied by an estimate of the uncertainty in the measured value. According to Ebraheem et al (16) , factors contributing to the total uncertainty may be separated into two types. The irst is associated mainly with the measuring equipment and the ilms, whereas the second type is mainly related to the calibration.…”

Section: Response Curvementioning

confidence: 99%

The use of polyvinyl chloride films dyed with methyl red in radiation dosimetry

Kattan¹,

Daher²

2016

IJRR

View full text Add to dashboard Cite

INTRODUCTIONDosimetry plays an important function in the quality control of radiation processing (1) . Radiochromic ilms dosimeters based on the radiation-induced color bleaching of organic dyes have been extensively investigated for high radiation dose dosimetry (2)(3)(4)(5)(6)(7) and also in radiotherapy (8) . Clear polyvinyl chloride (PVC) ilms were investigated (9) , but there are only a few articles published about the use of PVC as a dosimeter for gamma radiation. Khan and Ahmad (10) reported that undyed PVC ilms with thickness of 1 mm were useful as gamma radiation dosimeters in the range of 1-30 kGy, and were stable for up to 30 days after irradiation. Radiation-induced color bleaching of PVC ilms containing malachite green and bromocresol purple dyes were investigated as high-dose radiation dosimeters in the dose ranges of 0-125 kGy (11) and from 0 to 50 kGy (12) , respectively. The effect of gamma radiation on the organic dye methyl red and its possible use in chemical dosimetry was investigated (13) . The useful dose range of aqueous solution of methyl red in alkaline was between 50 and 6000 Gy. Radiation-chromic ilm based on polyvinyl butyral (PVB) dyed with methyl red was investigated as a high dosimeter (14) in the range up to 150 kGy.The aim of this study was to use polyvinyl chloride PVC ilms dyed with methyl red as a high dose dosimeter. Since radio-chromic ilms used in routine dosimetry systems are usually in luenced by the environmental conditions such as irradiation time, dose rate, shelf life and post irradiation time, this study investigated the effect of these parameters on the dose range up to 150 kGy. MATERIALS AND METHODS Films preparationCommercial PVC ilms from Sabic made from resins PVC57S with thickness of 60 µm, and

show abstract

Section: Response Curvementioning

confidence: 99%

The use of polyvinyl chloride films dyed with methyl red in radiation dosimetry

Kattan¹,

Daher²

2016

IJRR

View full text Add to dashboard Cite

show abstract

“…(10) The front side of a Gafchromic EBT2 film is UV protected, but the back side is not. (11) Gafchromic EBT3 is not a UV protected film. (12)…”

Section: A Gafchromic Films and Uv Lampsmentioning

confidence: 99%

Comparing three UV wavelengths for pre‐exposing Gafchromic EBT2 and EBT3 films

Katsuda

Gotanda

et al. 2015

J Applied Clin Med Phys

View full text Add to dashboard Cite

Gafchromic films are used for X‐ray dose measurements during diagnostic examinations and have begun to be used for three‐dimensional X‐ray dose measurements using the high‐resolution characteristics of Gafchromic films for computed tomography. However, the problem of unevenness in Gafchromic film active layers needs to be resolved. Double exposures using X‐rays are performed during therapeutic radiology, although this is difficult for a diagnostic examination because of a heel effect. Thus, it has been suggested that ultraviolet (UV) radiation be used as a substitute for X‐rays. However, the appropriate UV wavelength has not been determined. Thus, we conducted this study to decide an appropriate UV wavelength. UV peak wavelengths of 245 nm (UV‐A), 310 nm (UV‐B), and 365 nm (UV‐C) were used to irradiate EBT2 and EBT3 films. Each UV wavelength was irradiated for 5, 15, 30, and 60 min, and irradiation was then repeated every 60 min up to 360 min. Gafchromic films were scanned after every irradiation using a flatbed scanner. Images were split into RGB images, and red images were analyzed using ImageJ, version 1.44, image analysis software. A region of interest (ROI) one‐half inch in diameter was placed in the center of subtracted Gafchromic film images, and UV irradiation times were plotted against mean pixel values. There were reactions in the front and back of Gafchromic EBT3 and the back of Gafchromic EBT2 with UV‐A and UV‐B. However, UV‐C resulted in some reactions in both sides of Gafchromic EBT2 and EBT3. The UV‐A and UV‐B wavelengths should be used.PACS number(s): 87.53 Bn

show abstract

“…A number of photoactive materials were considered: Nalidixic acid (Tate et al, 1979), 8-methoxypsoralen (Diffey andDavis, 1978), phenothiazine (Diffey et al, 1977, Wong and Parisi, 1996, Parisi and Kimlin 2004, allyl diglycol carbonate or CR-39 (Wong et al, 1992, Wong et al, 1995, polyphenylene oxide or PPO (Davis et al, 1976b, Berre and Lala, 1989, Lester et al, 2003, diazochromic film (Ali and Jacobson, 1980, Jackson, 1980, Mosely et al, 1984, benoxaprofen (Diffey et al, 1982) and triphenyl tetrazolium chloride dye doped in poly vinyl alcohol (PVA) and poly vinyl butyral (PVB) (Ebraheem et al, 2000). Nalidixic acid was identified as being the most appropriate candidate to investigate further for use with polysulphone, due to the appropriate ease of handling and a response spectrum that extends into UVA wavelengths with a spectral response in the range of 280-350 nm (Tate et al, 1979) that may result in an approximation of the plant growth inhibition action spectrum when combined with PS in a combined dosimeter.…”

Section: Selection Of Photoactive Materialsmentioning

confidence: 99%