Detection Systems for Monitoring Intakes of Actinides at Trombay

Haridasan, T.K.; Surendran, TS; Sharma, Rajni; Krishnamony, S.

doi:10.1093/oxfordjournals.rpd.a082121

Cited by 2 publications

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“…The intake due to inhalation in reprocessing plants can be due to aerosols of plutonium-tributyl phosphate (Pu-TBP) complex which exhibits type-M behavior in which 90% of the deposit is absorbed into the blood with a clearance half life of 140 d [2]. In India, routine lung monitoring is carried out using phoswich or High Purity Germanium (HPGe) array detectors [3] in a shielded room. The measurement of Pu-Am lung burden is based on the detection of 59.5 keV γ rays of 241 Am [4].…”

Section: Introductionmentioning

confidence: 99%

Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of ²⁴¹Am in lungs and liver

et al. 2020

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The detection of internal contamination may be carried out by direct or indirect methods. The lung counting technique using an array of High Purity Germanium (HPGe) detectors is one of such direct detection methods. It is known from the literature that the estimation of activity by organ counting can lead to erroneous results if an amount of activity is possessed by an adjacent organ. In the case of HPGe-based lung monitoring, the estimation could be misleading if the activity is possessed by the liver, which is a proximal organ. In such cases the measured activity should be modified using cross-talk coefficients which account for the contribution from adjacent organs. The determination of cross-talk coefficients for 241Am was carried out by placing the detectors over inactive lungs of an Lawrence Livermore National Laboratory phantom when the source activity was contained in the liver and vice versa. A calibration matrix was formulated with calibration coefficients as diagonal elements and cross-talk coefficients as off-diagonal elements. The measured activities may be modified by matrix multiplication with the inverse of the calibration matrix to nullify the contribution from adjacent organs. The current work has empirically determined the fitting equations which relate calibration and cross-talk coefficients for lungs and liver measurement geometries with muscle-equivalent chest wall thickness (MEQ-CWT) values. The values of these coefficients were determined for an average MEQ-CWT of 1.77 cm for lungs and 1.33 cm for liver. The calculations showed that the activity contribution from liver to lungs was 29% higher than that of lungs to liver. A verification exercise was conducted to demonstrate this method. For the given calibration source, the percent overestimation was reduced for lung activity, while the liver activity was slightly underestimated. In the case of old exposure follow-up monitoring cases, the 241Am activity built up in liver could interfere with the lung monitoring results and this method using the calibration matrix may be used for estimation of more accurate results.

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Section: Introductionmentioning

confidence: 99%

Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of ²⁴¹Am in lungs and liver

et al. 2020

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The assessment of plutonium and americium in contaminated wounds with high energy resolution semiconductor detectors

Genicot

Hardeman

Oberstedt

1995

Applied Radiation and Isotopes

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Detection Systems for Monitoring Intakes of Actinides at Trombay

Cited by 2 publications

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Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of ²⁴¹Am in lungs and liver

Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of ²⁴¹Am in lungs and liver

The assessment of plutonium and americium in contaminated wounds with high energy resolution semiconductor detectors

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Detection Systems for Monitoring Intakes of Actinides at Trombay

Cited by 2 publications

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Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of 241Am in lungs and liver

Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of 241Am in lungs and liver

The assessment of plutonium and americium in contaminated wounds with high energy resolution semiconductor detectors

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Product

Resources

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Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of ²⁴¹Am in lungs and liver

Determination of calibration matrix for HPGe-based in vivo monitoring system for estimation of ²⁴¹Am in lungs and liver