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Radiation Protection Dosimetry Advance Access originally published online on July 1, 2006
Radiation Protection Dosimetry 2006 120(1-4):238-241; doi:10.1093/rpd/nci569
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Compact fluorescent lamp phosphors in accidental radiation monitoring

K. V. R. Murthy1,*, S. P. Pallavi1, Rahul Ghildiyal1, Manish C Parmar{dagger}, Y. S. Patel1, V. Ravi Kumar2, A. S. Sai Prasad2, V. Natarajan3 and A. G. Page3

1 Display Materials Laboratory, Applied Physics Department, Faculty of Technology and Engineering, M. S. University of Baroda, Baroda 390 001, Gujarat, India
2 Department of Physics, Vasavi College of Engineering, Hyderabad 500 028, Andhra Pradesh, India
3 Radio Chemistry Division, BARC, Mumbai 400 085, Maharashtra, India

* Corresponding author: drmurthykvr{at}yahoo.com

The application of lamp phosphors for accidental dosimetry is a new concept. Since the materials used in fluorescent lamps are good photo luminescent materials, if one can either use the inherent defects present in the phosphor or add suitable modifiers to induce thermoluminescence (TL) in these phosphors, then the device (fluorescent lamp) can be used as an accidental dosemeter. In continuation of our search for a suitable phosphor material, which can serve both as an efficient lamp phosphor and as a good radiation monitoring device, detailed examination has been carried out on cerium and terbium-doped lanthanum phosphate material. A 90Sr beta source with 50 mCi strength (1.85 GBq) was used as the irradiation source for TL studies. The TL response as a function of dose received was examined for all phosphors used and it was observed that the intensity of the TL peak vs. dose received was a linear function in the dose range 0.1–200 Gy in each case. Incidentally LaPO4: Ce,Tb is a component of the compact fluorescent lamp marketed recently as an energy bright light source. Besides having very good luminescence efficiency, good dosimetric properties of these phosphors render them useful for their use in accidental dosimetry also.


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