A PLA is a multi-employer, multi-union, pre-hire collective bargaining agreement that PLA proponents market to public and private construction owners as a tool to systemize labor relations between multiple construction trade unions and contractors on a specific construction site.
The alpha particle given off during the radioactive decay of americium-241 is absorbed by beryllium-9, producing carbon-12 and a neutron. Such devices can be used for the nondestructive testing of machinery and equipment and for other industrial applications.
Radioactive decay is the emission of energy in the form of ionizing radiation. Example decay chains illustrate how radioactive atoms can go through many transformations as they become stable and no longer radioactive.