“…The life span of erythrocytes can be determined by argon plasma mass spectrometry by using non-radioactive 50 Cr (Dever et al, 1989). The metabolism of glycosylated haemoglobins (Alayash et al, 1991), antioxidants (Kurata et al, 1993) or bile pigments (Avery et al, 1992) can also be used to calculate the erythrocyte life span. The loss of dicentrics plus rings in X-radiated cells has been used to study the life span of circulating human T cells (Bogen, 1993).…”