Poàn-kiám-kî (半減期; half-life) he̍k-chiá poàn-soe-kî (半衰期) sī chi̍t chióng bu̍t-chit ùi goân-pún ê sò͘-liōng khai-sí kiám-chió kàu chhun goân-pún sò͘-liōng ê chi̍t-pòaⁿ ê chit tōaⁿ kî-kan ê sî-kan tn̂g-té. Tī ūn-sǹg siōng, it-poaⁿ lóng kā poàn-kiám-kî piáu-sī chò t1⁄2. Poàn-kiám-kî tī hoán-èng tōng-le̍k-ha̍k sī chi̍t ê iông-ī chhek-tēng ê tiōng-iàu chham-sò͘. Poàn-kiám-kî chit-ê bêng-sû chia̍p-chia̍p tī goân-chú-hu̍t bu̍t-lí-ha̍k tiong iōng-lâi piáu-sī bô-ún-tēng goân-chú ê hòng-siā-sèng kín-bān thêng-tō͘.
| Poàn-kiám-kî ê chhù-sò͘ | Chhun ê pi-lē | Chhun ê pah-hun-pí | |
|---|---|---|---|
| 0 | 1/1 | 100 | |
| 1 | 1/2 | 50 | |
| 2 | 1/4 | 25 | |
| 3 | 1/8 | 12 | .5 |
| 4 | 1/16 | 6 | .25 |
| 5 | 1/32 | 3 | .125 |
| 6 | 1/64 | 1 | .563 |
| 7 | 1/128 | 0 | .781 |
| ... | ... | ... | |
| n | 1/2n | 100/(2n) | |
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