Physiological parameters that affect the transfer of radiocaesium to ruminants
Tóm tắt
Recently there has been a renewed interest in biological scaling relationships between parameters, such as those between, for example, body mass, dry matter intake and biological half-times of radionuclides that are useful in predicting the transfer of radiocaesium to different animal species, particularly to wild animals. However, there is still a considerable unexplained variability in transfer coefficient estimates between individuals of the same species. This paper discusses the physiological parameters that affect the transfer of radiocaesium to ruminants, and it shows how a better understanding of these parameters may help to reduce the within-species variability in radiocaesium transfer coefficients. In light of the improved understanding during the past 10–15 years of the importance of source-dependent bioavailability on absorption of radiocaesium from the gastrointestinal tract, it is concluded that further studies are required on the effects of feed digestibility and physiological factors on absorption and endogenous faecal excretion of radiocaesium to better understand the variability in transfer coefficients.
Tài liệu tham khảo
IAEA (1994) Handbook of parameter values for the prediction of radionuclide transfer in temperate environments. Technical Report Series 364. International Atomic Energy Agency, Vienna
Stara JF, Nelson NS, Della Rosa RJ, Bustad LK (1971) Comparative metabolism of radionuclides in mammals: a review. Health Phys 20:113–137
Mailhot H, Peters RH, Cornett RJ (1989) The biological half-life of radioactive Cs in poikilothermic and homeothermic animals. Health Phys 56:473–484
Holleman DF, Luick JR, Whicker FW (1971) Transfer of radiocesium from lichen to reindeer. Health Phys 21:657–666
Nalezinski S, Rühm W, Wirth E (1996) Development of a general equation to determine the transfer factor feed-to-meat for radiocesium on the basis of the body mass of domestic animals. Health Phys 70:717–721
Nilssen KJ, Sundsfjord JA, Blix AS (1984) Regulation of metabolic rate in Svalbard and Norwegian reindeer. Am J Physiol 247:R837–R841
Beresford NA, Mayes RW, Barnett CL, Lamb CS (2002) Dry matter intake—a generic approach to predict the transfer of radiocaesium to ruminants? Radioprotection—colloques 37:373–378
Beresford NA, Broadley MR, Howard BJ, Barnett CL, White PJ (2004) Estimating radionuclide transfer to wild species—data requirements and availability for terrestrial ecosystems. J Radiol Protection 24:A89–A103
Beresford NA (2003) Does size matter? In: International conference on the protection of the environment from the effects of ionizing radiation, Stockholm, 2003. IAEA-CN-109. International Atomic Energy Agency, Vienna, pp 182–185
Ward GM, Johnson JE (1986) Validity of the term transfer coefficient. Health Phys 50:411–414
Whicker FW, Schultz VS (1982) Radioecology: nuclear energy and the environment. CRC, Boca Raton, FL
Staaland H, Hove K, Pedersen Ø (1990) Transport and recycling of radiocaesium in the alimentary tract of reindeer. Rangifer Special Issue No 3:63–72
Mayes RW, Beresford NA, Howard BJ, Vandecasteele CM, Stakelum G (1996) Use of the true absorption coefficient as a measure of bioavailability of radiocaesium in ruminants. Radiat Environ Biophys 35:101–109
Beresford NA, Mayes RW, Cooke AI, Barnett CL, Howard BJ, Lamb CS, Naylor GPL (2000) The importance of source-dependent bioavailability in determining the transfer of ingested radionuclides to ruminant-derived food products. Environ Sci Technol 34:4455–4462
Howard BJ, Beresford NA (2001) Advances in animal radioecology. In: Brechignac F, Howard BJ (eds) Proceedings of international symposium in Aix-en-Provence, France, 3–7 September 2001. EDP Science, Les Ulis, pp 187–207
Beresford NA, Mayes RW, Howard BJ, Eayres HF, Lamb CS, Barnett CL, Segal MG (1992) The bioavailability of different forms of radiocaesium for transfer across the gut of ruminants. Radiat Prot Dosim 41:87–91
Stewart HF, Ward GM, Johnson JE (1965) Availability of fallout 137Cs to dairy cattle from different type of feed. J Dairy Sci 48:709–713
Johnson JE, Ward GM, Firestone E, Knox KL (1968) Metabolism of radioactive cesium (134Cs and 137Cs) and potassium by dairy cattle as influenced by high and low forage diets. J Nutr 94:282–288
Mayes RW, Eayres HF, Beresford NA, Lamb CS, Howard BJ (1992) Changes with age in the absorption of radiocaesium by sheep. Radiat Prot Dosim 41:83–86
Hansen HS, Hove K (1993) The effect of exercise on 134Cs retention in lambs. J Environ Radioactivity 19:53–66
Assimakopoulos PA, Ioannides KG, Karamanis D, Lagoyannis A, Pakou AA, Koutsotolis K, Nikolaou E, Arkhipov A, Arkhipov N, Gaschak S, Kurman A, Chizhevsky I (1995) Ratios of transfer coefficients for radiocesium transport in ruminants. Health Phys 69:410–414
Beresford NA, Mayes RW, Barnett CL, MacEachern PJ, Crout NMJ (1998) Variation in the metabolism of radiocaesium between individual sheep. Radiat Environ Biophys 37:277–281
Skuterud L, Pedersen Ø, Staaland H, Røed KH, Salbu B, Liken A, Hove K (2004) Absorption, retention and tissue distribution of radiocaesium in reindeer: effects of diet and radiocaesium source. Radiat Environ Biophys 43:293–301
Chertok RJ, Lake S (1973) Comparative effects of potassium, acetazolamide, furosemide, thyrotropin and thyroxin on 137Cs retention in the rat. Health Phys 24:43–52
Marshall GC, Kessler WV, Bom GS, Vetter RJ (1977) Effects of altered thyroid states on cesium-137 accumulation in the liver of rats. Health Phys 33:622–624
Lengemann FW, Lengemann FW Jr (1979) Retention of radiocesium by suckling rats as affected by oral supplements of potassium and L-thyroxine. Radiat Res 78:162–166
Everts ME, Clausen T (1988) Effects of thyroid hormone on Na+-K+ transport in resting and stimulated rat skeletal muscle. Am J Physiol 255:E604–E612
Oughton DH, Salbu B (1992) Stable cesium, rubidium and potassium distribution with reference to radiocaesium metabolism studies. Radiat Prot Dosim 41:217–222