Measurements have been made of tissue free water tritium(TFWT) and organically bound tritium(OBT) in food samples from Beijing
Lanzhou
Shanghai and Chengdu districts. The average TFWT and OBT concentration is 4.56Bq/L and 29.51Bq/L
respectively. And the SAR
the ratio of OBT to TFWT
is 6.47. The OBT concentration in food is found to be decreasing with latitude of the district.And the relation of the OBT concentrations with latitudes can be described by a linear equation. It is also found that the OBT concentrations in plant are significantly higher than that in animal food.