Mushure meizvozvo fission inodonha nekukurumidza kuitira kuti Co-60 fall-out iri 8 nguva yakasimba kudarika fission pagore rimwe uye 150 nguva yakasimba kudarika makore mashanu. Iyo isotopes yakagara kwenguva refu inogadzirwa ne fission yaizotora pamusoro pe 60Co zvakare mushure memakore makumi manomwe nemashanu. Iyo katatu "taiga" yenyukireya salvo bvunzo, sechikamu chepakutanga Kurume 1971 Pechora-Kama Canal chirongwa, yakaburitsa huwandu hushoma hwezvigadzirwa zve fission uye nekudaro huwandu hwakaenzana hwezvinhu zvakagadziriswa nyaya ndiyo inokonzeresa kusara kwechiitiko nhasi, kunyanya pa1 awa; 35 nguva yakasimba pa1 vhiki; 5 nguva yakasimba pamwedzi; uye yakaenzana pamwedzi mitanhatu.
Kazhinji ka8 kupfuura kupatsanuka kwepanyama panopera gore rimwe chete uye kanokwana ka150 kupfuura panopera makore mashanu