Compact fluorescent lamp phosphors in accidental radiation monitoring

KVR Murthy, SP Pallavi, R Ghildiyal… - Radiation protection …, 2006 - academic.oup.com
KVR Murthy, SP Pallavi, R Ghildiyal, MC Parmar, YS Patel, V Ravi Kumar, AS Sai Prasad…
Radiation protection dosimetry, 2006academic.oup.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 …
Abstract
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.
Oxford University Press
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