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☢️ 半衰期计算器Half-Life Calculator
计算放射性衰变后剩余量：N = N₀ × (1/2)^(t/T)，或由剩余比例反推经过时间。Remaining quantity after decay, N = N₀ × (½)^(t/T), or the time elapsed from the remaining fraction.
使用说明与常见问题How-to & FAQ
「半衰期计算器」是什么？What is the Half-Life Calculator tool?
计算放射性衰变后剩余量：N = N₀ × (1/2)^(t/T)，或由剩余比例反推经过时间。Remaining quantity after decay, N = N₀ × (½)^(t/T), or the time elapsed from the remaining fraction.
如何使用「半衰期计算器」？How do I use the Half-Life Calculator tool?
在「半衰期计算器」中，填写「初始量」、「半衰期」、「经过时间」、「或剩余%(反推时间)」等参数，结果会随输入实时计算并显示在下方。In the Half-Life Calculator: Fill in "Initial amount", "Half-life", "Elapsed time", "or Remaining % (solve time)"; results are recalculated instantly as you type.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「半衰期计算器」使用教科书标准公式，并列出所用公式和中间值，适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Half-Life Calculator uses standard textbook formulas and shows them, which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「半衰期计算器」免费吗？需要注册吗？Is the Half-Life Calculator free? Do I need an account?
「半衰期计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Half-Life Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.