John F Ashe, 83258 Bobwhite Ln, Bloomingdale, IL 60108

3955087, May 4, 1976

Sep 4, 1974

5/503487

John B. Ashe - Palatine IL

G. D. Searle & Co. - Skokie IL

G01N 2312

250360

A nucleonic device for measuring the moisture content of bulk materials using a radioisotopic fast-neutron source such as lithium-7 admixed with an alpha-particle emitter, such as americium-241, as a means of minimizing the thickness of the layer of bulk material required proximate to the moisture sensor for a neutron-reflection moisture gauge for proper operation of said gauge. Minimization of the required thickness of the bulk material permits use of a neutron-reflection moisture gauge for measurements of bulk materials on lightly-loaded belts and other types of conveyors where measurements have previously been impracticable.

4096389, Jun 20, 1978

May 10, 1976

5/684641

John B. Ashe - Palatine IL
Gwilym H. Williams - Palatine IL
Kenneth L. Sypal - Glen Ellyn IL

G. D. Searle & Co. - Chicago IL

G01N 2300

250445T

A collimator is disclosed for minimizing radiation exposure and improving resolution in radiation imaging devices. The collimator provides a penetrating beam of radiation from a source thereof, which beam is substantially non-diverging in at least one direction. In the preferred embodiment, the collimator comprises an elongated sandwich assembly of a plurality of layers of material exhibiting relatively high radiation attenuation characteristics, which attenuating layers are spaced apart and separated from one another by interleaved layers of material exhibiting relatively low radiation attenuation characteristics. The sandwich assembly is adapted for lengthwise disposition and orientation between a radiation source and a target or receiver such that the attenuating layers are parallel to the desired direction of the beam with the interleaved spacing layers providing direct paths for the radiation.

4029964, Jun 14, 1977

Aug 11, 1975

5/603377

John B. Ashe - Palatine IL

G. D. Searle & Co. - Skokie IL

G01T 120

250368

An improved transducer construction for a scintillation camera in which a light conducting element is equipped with a layer of moisture impervious material. A scintillation crystal is thereafter positioned in optical communication with the moisture impervious layer and the remaining surfaces of the scintillation crystal are encompassed by a moisture shield. Affixing the moisture impervious layer to the light conducting element prior to attachment of the scintillation crystal reduces the requirement for mechanical strength in the moisture impervious layer and thereby allows a layer of reduced thickness to be utilized. Preferably, photodetectors are also positioned in optical communication with the light conducting element prior to positioning the scintillation crystal in contact with the impervious layer.