Self-indicating radiation alert dosemeter (SIRAD)

Riel, G.K.; Winters, Patrick; Patel, Gordhan L.; Patel, Paresh

doi:10.1093/rpd/nci541

Cited by 8 publications

(4 citation statements)

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“…As the lowest color scale indicator on the card is for 50 mSv, readings below 50 mSv are not possible by eye. However, in many radiation emergency scenarios it is likely the first responder will receive an exposure less than 50 mSv and it is unclear whether scanning densitometry could be used to perform quantitative readings within, or perhaps even below, the manufacturer specified dose range after returning from the field (Stewart 2005; Riel et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Extension of the RADTriage Colorimetric Dosimeter to Low-Dose Gamma-Ray Exposure Using Scanning Densitometry

et al. 2022

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There is a need for an instantly indicating, easy-to-read, and inexpensive ionizing radiation dosimeter for first responders and members of the general public. One commercially available option is the RADTriage50TM colorimetric dosimeter. However, existing literature has not adequately addressed the accuracy of RADTriage50 dosimeters at low doses of ionizing radiation (<50 mSv) or the need for methods to quantitatively read the RADTriage50 dosimeters after they are exposed. In this paper, we use digital scanning methods to read the RADTriage50 dosimeters. The performance of the dosimeters was evaluated by irradiation with a gamma irradiator traceable to national standards. Experiments covered a range of deep dose equivalents (50 mSv to 2,000 mSv) within the manufacturer’s specified range (50 mSv to 4,000 mSv) and also below 50 mSv to determine if the digital scanning densitometry method allowed for a quantitative readout with a greater dynamic range. We also conducted tests using different gamma energies, 137Cs (662 keV) and 60Co (1.17 and 1.33 MeV), and different dose rates to evaluate the dependency of the RADTriage50 dosimeters on these parameters. Modeling of our measurements suggests that the dose-response of the RADTriage50 dosimeter is linear at low doses with strong non-linearity beginning at ~750 mSv and the dosimeter response appearing to plateau at ~2,000 mSv, although additional measurements at doses beyond 2,000 mSv are needed to confirm this finding. We also found that the RadTriage50 dosimeter response varied with gamma energy, but not with dose rate.

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Section: Introductionmentioning

confidence: 99%

Extension of the RADTriage Colorimetric Dosimeter to Low-Dose Gamma-Ray Exposure Using Scanning Densitometry

et al. 2022

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“…In both cases, the result is a material with a fascinating array of interesting physical properties (see Figure for the chemical structure of the PDA backbone). The dramatic color changes associated with the solid-state polymerization have led to commercial applications as “time−temperature” indicators and radiation dosage monitors . The various polymer forms have also been explored in a number of sensing applications due to the sensitivity of adsorption and fluorescent properties to applied stress, , light or heat exposure, ,− changes in the chemical environment, or exposure to biochemicals .…”

Section: Introductionmentioning

confidence: 99%

“…The various polymer forms have also been explored in a number of sensing applications due to the sensitivity of adsorption and fluorescent properties to applied stress, , light or heat exposure, ,− changes in the chemical environment, or exposure to biochemicals . Thus, the low cost, highly regular polymeric structure, and strong colorimetric response of PDAs have paved the way for numerous sensing/detector applications spanning analytical, environmental, and biomedical ,,, fields. Interestingly, from a theoretical standpoint, there remains intense interest in understanding the relationship between torsional distributions and properties such as the excitation energy transport and effective conjugation length in linearly conjugated polymers.…”

Section: Introductionmentioning

confidence: 99%

Torsion Potential in Polydiacetylene: Accurate Computations on Oligomers Extrapolated to the Polymer Limit

2010

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The optoelectronic properties of polydiacetylenes can be strongly modulated by torsions along the polymer chains. These as well as other distortions of the nominally coplanar polydiacetylene backbones result in the major color changes observed for these materials in response to a variety of external, low-energy stimuli; such color changes form the basis for the many applications of polydiacetylenes as sensor materials. There has been little theoretical work related to backbone distortions in polydiacetylenes; actually, previous estimates of the torsional barriers in these systems differ by an order of magnitude. Understanding the impact that polymer torsions have upon the properties of polydiacetylenes necessitates accurate estimates of the torsion potentials. Here, by using computationally efficient, wave-function-based electronic structure methods on increasingly larger oligomers, we present reliable estimates of the torsional barriers in model diacetylene oligomers and provide an accurate extrapolation of these values to the polymer limit.

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“…The manufacturers developed the badge for personal dosimetry of staff that may be exposed to high radiation levels, such as those who may deal with radiation dirty bombs (Watanabe et al 2006) or in areas of radiation accidents. The SIRAD badge is based on a radiochromic dye insert which changes colour automatically when exposed to radiation (Riel et al 2006). With the SIRAD badge the change is from a clear to blue colour upon radiation in the dose range of 0 R to 200 R. The radiochromic window is protected from ultraviolet exposure with an opaque cover which can be easily flipped back to reveal the radiochromic window and calibration chart.…”

Section: Introductionmentioning

confidence: 99%

Visible absorption spectra of radiation exposed SIRAD dosimeters

Butson¹,

Cheung²,

Yu³

2006

Phys. Med. Biol.

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SIRAD badge dosimeters are a new type of personal dosimeter designed to measure radiation exposure up to 200 R and give a visual qualitative measurement of exposure. This is performed using the active dosimeter window, which contains a radiochromic material amalgamated in the badge assembly. When irradiated, the badges active window turns blue, which can be matched against the given colour chart for a qualitative assessment of the exposure received. Measurements have been performed to analyse the absorption spectra of the active window, and results show that the window automatically turns a blue colour upon irradiation and produces two peaks in the absorption spectra located at 617 nm and 567 nm. When analysed with a common computer desktop scanner, the optical density response of the film to radiation exposure is non-linear but reproducible. The net OD of the film was 0.21 at 50 R exposure and 0.31 at 200 R exposure when irradiated with a 6 MV x-ray energy beam. When compared to the calibration colour strips at 6 MV x-ray energy the film's OD response matches relatively well within 3.5%. An approximate 8% reduction in measured OD to exposure was seen for 250 kVp x-rays compared to 6 MV x-rays. The film provides an adequate measurement and visually qualitative assessment of radiation exposure for levels in the range of 0 to 200 R.

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Self-indicating radiation alert dosemeter (SIRAD)

Cited by 8 publications

References 0 publications

Extension of the RADTriage Colorimetric Dosimeter to Low-Dose Gamma-Ray Exposure Using Scanning Densitometry

Extension of the RADTriage Colorimetric Dosimeter to Low-Dose Gamma-Ray Exposure Using Scanning Densitometry

Torsion Potential in Polydiacetylene: Accurate Computations on Oligomers Extrapolated to the Polymer Limit

Visible absorption spectra of radiation exposed SIRAD dosimeters

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