Evaluation of Threshold Levels for Effects of Chronic Exposure of Mammals with Different Life Expectancies

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Abstract

The lower threshold values of the chronic exposure rate, above which negative radiobiological effects appear, are assessed and compared for mammals with low and high natural life expectancy. Dataset has been prepared, containing information on the observed radiobiological effects of chronic irradiation in mammals, depending on the dose rate. The dataset includes 118 records for mammals with high life expectancy and 92 records for mammals with low life expectancy. Data were analyzed with the nonparametric statistics. The lower threshold for deterministic radiation effects of chronic exposure for long-lived mammals is 0,1 mGy/day, with a 95% confidence interval 0.04 – 0.3 mGy/day. For mammals with a short natural life cycle, this threshold value is one order of magnitude higher – 1 mGy/day, with a 95% confidence interval of 0.5–1.1 mGy/day. It is concluded that the quantitative radiation safety criteria for long-lived and short-lived mammal species differ, which should be taken into account when assessing the ecological risk of radioactive contamination of the environment.

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About the authors

Tatiana G. Sazykina

Research and Production Association «Typhoon»

Author for correspondence.
Email: ecomod@yandex.ru
ORCID iD: 0000-0002-9082-5190

doctor of physical and mathematical sciences, major research scientist

Russian Federation, Obninsk

Alexander I. Kryshev

Research and Production Association «Typhoon»

Email: ecomod@yandex.ru
ORCID iD: 0000-0001-6816-0260

doctor of biological sciences, leading research scientist

Russian Federation, Obninsk

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2. Fig. 1. Cumulative frequency distribution of chronic dose rate at which radiation effects were detected in mammals with high and low natural life expectancy.

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