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Year : 2016  |  Volume : 39  |  Issue : 4  |  Page : 199-203

Development of chloroform: Methyl red dosimeter for blood irradiation dosimetry

1 Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India
2 Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India

Correspondence Address:
Sandip Mondal
1-130 H, MOD Labs, Radiation Standards Section, Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.199978

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The use of chloroform (CHCl3) solution containing methyl red (CMR) was investigated for the dosimetric application. This is based on the radiolytic formation of hydrochloric acid from CHCl3, which protonates a pH indicator, namely, methyl red, and leads to a visual change in color. The optimum concentration of methyl red and wavelength for absorption maxima for the dosimeter were established at 2 × 10−4 mol/dm 3 and 550 nm, respectively. The useful dose range for the dosimeter is 5–50 Gy. The reproducibility of the system is found to be within ±5%. Pre- and post-irradiation stability of the dosimeter solution was also investigated for 1 month and 24 h, respectively. The importance of a chemical dosimeter in the dose range of 5–50 Gy prominently lies in applications such as blood irradiation. Thus, dose mapping of the Blood Irradiator-2000 was carried out using CMR dosimeter. These dose values were further confirmed using a reference standard Fricke dosimeter.

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