Method of measuring pore diameters by positronium decay

Details Method of measuring pore diameters by positronium decay Method of measuring pore diameters by positronium decay

1988-12-19

1990-01-30

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250308, 250393, G01N 2300

Patent

active

048975494

ABSTRACT:
A method is shown for measuring naturally occurring pores in a specimen material. A positron is emitted from a radioactive source and enters a material to pick up an electron to form positronium. The positronium decays very rapidly into two gamma rays. The lifetime of the positronium depends on the size of the pore it is trapped within. The larger the pore, the longer the positronium will last. By measuring the decay rate of positrons over an extended time scale in the range from 30 to 500 nsec., a near relation can be developed between positronium lifetime and pore diameter.

REFERENCES:
patent: 2437935 (1948-03-01), Brunner et al.
patent: 3154773 (1964-10-01), Meile et al.
patent: 3435217 (1969-03-01), Givens
patent: 3593025 (1971-07-01), Grosskreutz
patent: 4463263 (1984-07-01), Padawer
patent: 4700067 (1987-10-01), Carossi et al.
patent: 4835390 (1989-05-01), Blatchley et al.

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