Unlike cosmogenic isotopes produced in the atmosphere, 41 Ca is produced by neutron activation of 40 Ca, primarily in the top metre of the soil column, where the cosmogenic neutron flux is still sufficiently strong.
41 Ca is produced by neutron activation of 40 Ca in the top metre of the soil column. This was primarily. This was unlike cosmogenic isotopes. These cosmogenic isotopes were produced in the atmosphere. The cosmogenic neutron flux is still sufficiently strong.