Ramachandra K. Bhat - Springfield VA Janine P. Guadagno - Springfield VA
Assignee:
The United States of America as represented by the Secretary of the Army - Washington DC
International Classification:
G01V 500 G01T 1169
US Classification:
2502521
Abstract:
This invention relates to a method for preparing radium-free standard solutions of radon-222-in-water of known concentration for use in the more accurate calibrating of liquid scintillation counters than obtainable by the use of radium-226 as standards for calibration. A radium-free radon-in-water standard of the type contemplated herein is defined as a known volume of deionized water with a known activity of radon gas without the presence of any radium activity. This new method provides for the rapid, accurate and inexpensive analysis of Radon-222 water samples by utilizing standards whose activity is derived from actual instrumental quantitative analysis as opposed to problematical mathematical derivation. Using a glass jar generator apparatus, this method generates with a few days a radium-free radon-222-in-water standard whose concentration is determined by gamma spectroscopy using one sample portion of the standard; and at the same time, using cocktail diluted mixtures of plural sample portions of the same standard to calibrate simultaneously one or several liquid scintillation systems.
Ramachandra K. Bhat - Springfield VA Janine P. Guadagno - Springfield VA Clarence E. Duncan - Fredricksburg VA
Assignee:
The United States of America as represented by the Secretary of the Army - Washington DC
International Classification:
G01C 1710
US Classification:
33348
Abstract:
A magnetic compass is illuminated by a light emitting diode. The compass is nclosed in a case made of a lightweight, plastic composite material. The light-emitting diode is energized by a low profile, nonmagnetic battery connected to the light emitting diode through a nonmagnetic microswitch operated on the exterior of the casing by a pushbutton. The compass has a compass rose with strips of phosphorescent material disposed thereon, a rotatable bezel with a strip of phosphorescent material thereon and a lid having a sighting slot therein traversed by a cross hair. Located at the bottom and top of the cross hair are additional strips of phosphorescent material so that the compass may be utilized in the dark. The phosphorescent material may be charged by ambient light and by light emitted by the light emitting diode.
USA Physicians GroupUniversity South Alabama Childrens & Womens Hospital Neonatal 1700 Ctr St, Mobile, AL 36604 251 415-1055 (phone), 251 415-1045 (fax)
Education:
Medical School Karnataka Inst Med Sci, Karnataka Univ, Hubli, Karnataka, India Graduated: 2002
Languages:
English
Description:
Dr. Bhat graduated from the Karnataka Inst Med Sci, Karnataka Univ, Hubli, Karnataka, India in 2002. He works in Mobile, AL and specializes in Neonatal-Perinatal Medicine. Dr. Bhat is affiliated with University South Alabama Medical Center.