In-ground environmental radioactivity monitoring in the Culpeper Basin, Virginia, using LiF thermoluminescence dosimeters
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A new environmental in-ground radioactivity monitoring technique using LiF thermoluminescence dosimeters was tested in the Culpeper Basin, Northern Virginia. The dosimeters were buried at a depth of 0.45 m (∼ 18 in.) for approximately four months. There was a significant positive correlation (at the 99.9% confidence level) between the total accumulated radioactivity signal from the dosimeters and the on-site 100 second gamma-ray spectrometer measurements. The minimum-maximum dose rate from the buried thermoluminescence dosimeter measurements was 0.06 to 1.08 mR per day (or 2.5 to 44.5µR per hour).
There are two factors which permit better background levels of radioactivity to be established by thermoluminescence dosimeters compared with other methods for environmental monitoring programs. First is the great sensitivity of thermoluminescence dosimeters in terms of minimum dose rate that can be registered (mR per month orµR per hour). Second is the fact that accumulation of radioactivity signal over a long period of time tends to eliminate short-term environmental changes that affect measurements with gamma-ray spectrometers and scintillation counters.
KeywordsDose Rate Significant Positive Correlation Monitoring Program Environmental Monitoring Scintillation Counter
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