Try 1g Al with thermal flux activation 27Al(act)28Al @ 0 hrs |flux|activity| |----|--------| |1e13|2.4535e6| |1e14|2.4535e7| |1e15|2.4534e8| |1e16|2.4531e9| |1e17|2.4499e10| |1e18|2.4189e11| |1e19|2.1207e12| |1e20|5.7135e12|