1391
The isotopes lighter than Ca usually undergo beta plus decay to isotopes of potassium , and those heavier than Ca usually undergo beta minus decay to isotopes of scandium , although near the nuclear drip lines , proton emission and neutron emission begin to be significant decay modes as well .
 location: Ca; location: Ca
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ca, Ca 
Answer:
 location: Ca; location: Ca