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Nuclear facts about Ra-226
#1
Ra-226 is a product of U-238 decay, and is the longest-lived isotope of radium with a half-life of 1600 years. Decay half-time is 1600 years.

Some significant facts about Ra-226 decay:
Decay mode: alpha (100%), Q-value=4870.6 keV
Gamma rays: 186.211 keV (3.59%), 262.27 keV (0.005%), ...
X-rays: 14.316 keV (0.323%), 83.787 keV (0.319%), 81.069 keV (0.192%), ...
Alpha rays: 4784.34 keV (94.45%), 4601 keV (5.55%), ...
Cluster decay: 3.2E-9%

More details here: http://nucleardata.nuclear.lu.se/toi/nuc...iZA=880226
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