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Development and dosimetric characterization of indigenous PADC for personnel neutron dosimetry

Pal Rupali (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)
Nadkarni Vishnu S. (Goa University, Department of Chemistry, Taleigao Plateau, Goa, India)
Naik Diptesh (Goa University, Department of Chemistry, Taleigao Plateau, Goa, India)
Beck Mudit (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)
Bakshi Ashok Kumar (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)
Chougaonkar Mohan Pundarinath (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)
Chourasiya Ghanshyam (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)
Mayya Yelia Shankaranarayana (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)
Babu Devu Appala Raju (Bhabha Atomic Research Centre, Radiological Physics & Advisory Division, Mumbai, India)

CR-39 is a solid state nuclear track detector, chemically known as poly-allyl-diglycol-carbonate, widely used for personnel neutron monitoring because of its sensitivity to neutrons, excellent optical properties that facilitate the analysis and sufficiently long shelf life. Presently, this detector is imported and is being used for the personnel neutron monitoring programme in India. Hence, an effort was made towards the indigenous development of these detectors. Different chemical processes for the indigenous development of the poly-allyl-diglycol-carbonate detector, such as the synthesis of allyl-diglycol-carbonate monomer and isopropyl-peroxydicarbonate as initiators for the polymerization process, were carried out and are reported in this paper. A method for casting unbroken poly-allyl-diglycol-carbonate sheets sized 25 cm x 15 cm and of a thickness between 500 µm and 800µm was developed. A longer polymerization process also helps to increase neutron sensitivity, reduce the minimum detection limit and increase the signal-to-noise ratio of the detector. The study suggests that it is possible to develop indigenous poly-allyl-diglycol-carbonate detectors with a minimum detection limit of 0.1 mSv and signal-to-noise ratio of 8.0.

Keywords: poly-allyl-diglycol-carbonate, electrochemical etching, neutron dosimetry