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	Kritikalitetssäkerhetsanalys	Analys av nukleär sönderfall
Ämnesområde	Kärnfysik	Kärnfysik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1938	1900
Upphovsperson	Otto Hahn, Fritz Strassmann	Ernest Rutherford, Frederick Soddy
Typ	safety assessment methodology	analytical process model
Ursprungskälla	American National Standards Institute (2019). Nuclear Criticality Safety in Operations with Fissionable Material Outside Reactors. ANSI/ANS-8.1-19.40.	Evans, R. D. (1955). The Atomic Nucleus. McGraw-Hill.
Alias	nuclear safety assessment, chain reaction analysis, fissile material control	decay kinetics, radioactive decay modeling, half-life analysis
Närliggande	5	5
Sammanfattning	Criticality safety analysis is a systematic evaluation of fissile material systems to ensure nuclear chain reactions remain controlled, originating from Hahn and Strassmann's 1938 discovery of nuclear fission. It determines safe limits on fissile mass, concentration, geometry, and spacing using neutron transport calculations and experimental validation to prevent uncontrolled nuclear excursions in storage, processing, and transportation.	Nuclear decay analysis is the systematic study of radioactive transformation processes, originating from Rutherford and Soddy's work in the early 1900s. It quantifies the rate and modes of nuclear disintegration using decay constants, half-lives, and branching ratios to predict activity evolution, date samples via radiometric methods, and assess the long-term hazard from radioactive materials.