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Influence of human biokinetics of strontium on internal ingestion dose of 90Sr and absorbed dose of 89Sr to organs and metastases

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Abstract

The objective of the present work is to apply the plasma clearance parameters to strontium, previously determined in our laboratory, to improve the biokinetic and dosimetric models of strontium-90 (90Sr) used in radiological protection; and also to apply this data for the estimation of the radiation doses from strontium-89 (89Sr) after administration to patients for the treatment of the painful bone metastases. Plasma clearance and urinary excretion of stable strontium tracers of strontium-84 (84Sr) and strontium-86 (86Sr) were measured in GSF-National Research Center for Environment and Health (GSF) in 13 healthy German adult subjects after intravenous injection and oral administration. The biological half-life of strontium in plasma was evaluated from 49 plasma concentration data sets following intravenous injections. This value was used to determine the transfer rates from plasma to other organs and tissues. At the same time, the long-term retention of strontium in soft tissue and whole body was constrained to be consistent with measured values available. A physiological urinary path was integrated into the biokinetic model of strontium. Parameters were estimated using our own measured urinary excretion values. Retention and excretion of strontium were modeled using compartmental transfer rates published by the International Commission on Radiological Protection (ICRP), the SENES Oak Ridge Inc. (SENES), and the Urals Research Center for Radiation Medicine (TBM). The results were compared with values calculated by applying our GSF parameters (GSF). For the dose estimation of 89Sr, a bone metastases model (GSF-M) was developed by adding a compartment, representing the metastases, into the strontium biokinetic model. The related parameters were evaluated based on measured data available in the literature. A set of biokinetic parameters was optimized to represent not only the early plasma kinetics of strontium but also the long-term retention measured in soft tissue and whole body. The ingestion dose coefficients of 90Sr were computed and compared with different biokinetic model parameters. The ingestion dose coefficients were calculated as 2.8 × 10−8, 2.1 × 10−8, 2.5 × 10−8 and 3.8 × 10−8 Sv Bq−1 for ICRP, SENES, TBM and GSF model parameters, respectively. Moreover, organ absorbed dose for the radiopharmaceutical of 89Sr in bone metastases therapy was estimated based on the GSF and ICRP biokinetic model parameters. The effective doses were 3.3, 1.8 and 1.2 mSv MBq−1 by GSF, GSF-M, and ICRP Publication 67 model parameters, respectively, compared to the value of 3.1 mSv MBq−1 reported by ICRP Publication 80. The absorbed doses of red bone marrow and bone surface, 17 and 21 mGy MBq−1 calculated by GSF parameters, and 7.1 and 8.8 mGy MBq−1 by GSF-M parameters, are comparable to the clinical results of 3–19 mGy MBq−1 for bone marrow and 16 mGy MBq−1 for bone surface. Based on the GSF-M model, the absorbed dose of 89Sr to metastases was estimated to be 434 mGy MBq−1. The strontium clearance half-life of 0.25 h from the plasma obtained in the present study is obviously faster than the value of 1.1 h recommended by ICRP. There are no significant changes for ingestion dose coefficients of 90Sr using different model parameters. A model including the metastases was particularly developed for dose estimation of 89Sr treatment for the pain of bone metastases.

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Acknowledgments

We thank James E. Turner, Matthias Greiter and Augusto Giussani for a valuable review of the manuscript. We thank Andrei Iulian Apostoaei for providing us his dissertation. Thanks are due to the reviewers for their valuable comments.

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  1. Institute of Radiation Protection, GSF-National Research Center for Environment and Health, 85746, Neuherberg, Germany

    Wei Bo Li, Vera Höllriegl, Paul Roth & Uwe Oeh

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  1. Wei Bo Li
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Li, W.B., Höllriegl, V., Roth, P. et al. Influence of human biokinetics of strontium on internal ingestion dose of 90Sr and absorbed dose of 89Sr to organs and metastases. Radiat Environ Biophys 47, 225–239 (2008). https://doi.org/10.1007/s00411-007-0154-8

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