长半衰期缓发中子
long period delayed neutron
物质长期输运
the substance’s long-term transport
生物半衰期
biological half-life
biological half life
biological half life period
biologic half life
tritium
促生长物质
growth-stimulated substance
Growth-promoting substances
促植物生长物质
improving plant growth substance
内源生长物质
endogenous growth regulators
双波长物质的量比法
dual wavelength substantial amount ratio method