Direct determination of /sup 222/Rn gas using the electret to remove daughters at formation. Annual progress report, June 1, 1981-May 31, 1982

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5032165

Harley, N H

This report covers progress made from 1 June 1981 to 31 May 1982 in developing a continuous monitor which measures only /sup 222/Rn without interference from the daughters. Five /sup 222/Rn counters have been built which determine /sup 222/Rn alone by alpha scintillation counting in the presence of an electret to remove the short-lived daughter products from the counting chamber. The chamber design is based on the work of Chittaporn et al., (1981) at New York University's Department of Environmental Medicine. The detection chamber is a 1.8 liter (12.7 cm diameter by 14 cm high) cylinder lined with zinc sulfide alpha phosphor. The detector sits directly on a 12.7 cm diameter phototube. The 5 units have calibration factors which range from 155 to 186 counts/hour per pCi /sup 222/Rn/liter and an average background count of 6 counts/hour. The lower limit of detection for a one hour count is thus 0.03 pCi /sup 222/Rn/l, well below environmental levels.

• Research Organization: New York Univ., NY (USA). Medical Center
• DOE Contract Number: AC02-80EV10374
• OSTI ID: 5032165
• Report Number(s): DOE/EV/10374-2; ON: DE82020802
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
500300 -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALPHA DECAY RADIOISOTOPES
CALIBRATION
DAYS LIVING RADIOISOTOPES
DESIGN
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
MONITORING
NUCLEI
RADIATION DETECTORS
RADIATION MONITORING
RADIOISOTOPES
RADON 222
RADON ISOTOPES
SCINTILLATION COUNTERS