Positron-annihilation-radiation transmission gauge

Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

250308, 2503581, G01T 120, G01N 2300

Patent

active

044632630

ABSTRACT:
A radiographic method and apparatus for nondestructively monitoring a specimen for density variations are disclosed.
A positron-annihilation-radiation-emitting point source is situated approximately midway along the axis separating two detectors sensitive to positron-annihilation (0.511-MeV photon) radiation. The outputs of the two detectors are fed to an electronic circuit that reckons only time-coincident events that are sensed simultaneously in the two detectors. The specimen to be measured is positioned between the source and one of the detectors such that the cone of detected, i.e., coincident, photons intercepts the region of interest. The number of coincidences that are counted in a preset time interval are recorded, or, alternatively, the coincidence count rate is monitored directly with a ratemeter.
A linear scan of the region of interest is performed by the sequential displacing of the source/detectors axis with respect to the measured specimen, or the specimen with respect to the source/detectors axis. The number of coincidence counts accumulated within a preset time interval are recorded for each displacement. The spatial variation of density within the specimen is inferred from corresponding variations in the coincidence count rate.

REFERENCES:
patent: 2613326 (1952-10-01), Herzog
patent: 2903590 (1959-09-01), Somerville
patent: 2968729 (1961-01-01), Pepper et al.
patent: 3011057 (1961-11-01), Anger
patent: 3193680 (1965-07-01), Anderson
patent: 3234386 (1966-02-01), Leventhal et al.
patent: 3573458 (1971-04-01), Anger
patent: 3593025 (1971-07-01), Grosskreutz
patent: 3668386 (1972-06-01), Blecherman
patent: 3786256 (1974-01-01), Untermyer
patent: 3970855 (1976-07-01), Holt et al.
patent: 3980885 (1976-09-01), Steward et al.
patent: 4064438 (1977-12-01), Alex et al.
patent: 4194115 (1980-03-01), Whitehead et al.
patent: 4268753 (1981-05-01), Murakami et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Positron-annihilation-radiation transmission gauge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Positron-annihilation-radiation transmission gauge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positron-annihilation-radiation transmission gauge will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-187332

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.