Absolute Measurement of Sulfur-35

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Nippon Genshiryoku Gakkai-Shi

DOI:https://doi.org/10.3327/jaesj.4.435· OSTI ID:4770212

WATANABE, Tamaki

In measuring the absolute activity of soft- BETA emitters such as S³⁵, the main error arises from self-absorption of BETA radiation by the source. A method of preparing a S³⁵ source having only slight self-absorption, and of estimating the self-absorption of this source, is discussed. The source preparation procedure is as follows: the sample solution, sulfuric acid in dilute hydrochloric acid solution, is dropped onto a thin vinyl film and dried on a dessicant; this source is then dissolved with redistilled water and again dried up in an ammoniac atmosphere. Nb⁹⁵, which emits a BETA particle with the same maximum and mean energy as that emitted by S³⁵ and also emits a prompt gamma ray, is also studied. Crystal sizes in the Nb⁹⁵ source are compared with those in the S/sup 35/ source microscopically. Self-absorption in the Nb⁹⁵ source is measured by determinations of the ratio of BETA counting rate/ BETA - gamma coincidence counting rate in a 4 pi ge ometry. The amount of self-absorption in sources prepared by the method described ranges from 2 to 5%. (auth)

• Research Organization: Japan Atomic Energy Research Inst., Tokyo
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-030339
• OSTI ID: 4770212
• Journal Information: Nippon Genshiryoku Gakkai-Shi, Journal Name: Nippon Genshiryoku Gakkai-Shi Journal Issue: 7 Vol. 4; ISSN 0004-7120
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ABSORPTION
AMMONIA
BETA DETECTION
CHEMISTRY
COINCIDENCE METHODS
CRYSTALS
ERRORS
FILMS
GAMMA DETECTION
GAMMA RADIATION
HYDROCHLORIC ACID
MICROSCOPY
NIOBIUM 95
PREPARATION
QUANTITATIVE ANALYSIS
SELF-ABSORPTION
SOLUTIONS
SULFUR 35
SULFURIC ACID
VINYL RADICALS
WATER