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Radiation Protection Dosimetry Advance Access originally published online on March 24, 2006
Radiation Protection Dosimetry 2006 120(1-4):259-262; doi:10.1093/rpd/nci541
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Published by Oxford University Press (2006).

Self-indicating radiation alert dosemeter (SIRAD)

Gordon K. Riel1,*, Patrick Winters1, Gordhan Patel2 and Paresh Patel2

1 Naval Surface Warfare Center, Carderock Division, code 643 (NSWCCD), Bethesda, MD 20817-5700, USA
2 JP Laboratories Inc., 120 Wood Avenue, Middlesex, NJ 08846, USA

* Corresponding author: gordon.riel{at}navy.mil

In an event of a nuclear or dirty bomb explosion and a radiological accident, there is a need for self-indicating instant radiation dosemeter for monitoring radiation exposure. The self-indicating instant radiation alert dosemeter (SIRAD) is a credit card size radiation dosemeter for monitoring ionising radiation from a few hundredths of a Gray to a few Gray. It is always active and is ready to use. It needs no battery. The dosemeter develops colour instantly upon exposure, and the colour intensifies with dose. It has a colour chart so that the dose on the active element may be read by matching its colour with the chart that is printed next to it on the card. However, in this work, the dose is measured by the optical density of the element. The dosemeter cannot be reset. The response changes by <1% per °C from –20 to +60°C. The shelf-life is >3 y at room temperature. It contains no hazardous materials. The dosemeter would meet the requirements of instantly monitoring high dose in an event of a nuclear or dirty bomb explosion or a radiation accident.


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