After the culture end and the measurement of the length and density of neural axons, the samples were taken out for isotopic radioactivemeasurement.
培养结束，测量神经突起长度、密度后，取出标本作同位素放射性测定。
2
METHODS: Radioactive microsphere technique (RMT) was used in the measurement and calculation of PBF.
方法：采用放射性生物微球技术，测量并计算犬牙髓组织的PBF值。
3
The measurement of the decay of radioactive isotopes, especially uranium, strontium, rubidium, argon and carbon, has allowed geologists to more precisely determine the age of rock formations.