▁er u ption ▁of ▁Mount ▁Sam al as ▁near ▁Mount ▁R in j ani , ▁and ▁the ▁ 1 8 1 5 ▁er u ption ▁of ▁Mount ▁Tamb ora . ▁ ▁Age ▁ ▁History ▁of ▁ ▁w ig gle - match ing ▁d ating ▁ ▁In ▁ 1 9 9 6 , ▁Dun lap ▁reported ▁a ▁high - prec ision ▁w ig gle - match ing ▁age ▁determined ▁at ▁the ▁University ▁of ▁Arizona ▁as ▁ 1 0 3 9 ▁ ± ▁ 1 8 ▁AD ( 2 σ ). ▁However , ▁in ▁ 1 9 9 8 , ▁Li u ▁reported ▁ ▁measurements ▁from ▁the ▁center ▁to ▁the ▁edge ▁of ▁the ▁wood , ▁followed ▁by ▁fitting ▁with ▁a ▁high - ac cur acy ▁tree ▁ring ▁cal ibr ating ▁curve , ▁the ▁obtained ▁age ▁of ▁the ▁Mill en ni um ▁er u ption ▁was ▁determined ▁to ▁be ▁ 1 2 1 5 ▁ ± ▁ 1 5 ▁AD . ▁In ▁ 2 0 0 0 , ▁Horn ▁reported ▁another ▁w ig gle - match ed ▁radi oc ar bon ▁d ating ▁with ▁an ▁A MS - mass ▁spect rom eter , ▁and ▁the ▁interval ▁of ▁highest ▁probability ▁is ▁ 9 6 9 ▁+ 2 4 /- 1 5 ▁AD ( 9 4 5 – 9 8 4 ▁AD ; ▁ 2 σ ), ▁which ▁is ▁widely ▁used . ▁In ▁the ▁ 2 0 0 0 s , ▁at ▁least ▁ 5 ▁high - prec ision ▁ ▁w ig gle - match ing ▁ages ▁had