Accession Number:

ADA167028

Title:

Feasibility Study for Field Monitoring of Water Supplies for Radioactivity.

Descriptive Note:

Final rept. on Phase 1.

Corporate Author:

TECHNOLOGY FOR ENERGY CORP KNOXVILLE TN

Personal Author(s):

Report Date:

1986-03-20

Pagination or Media Count:

96.0

Abstract:

The feasibility study for field monitoring of water supplies for radioactivity has been completed. A detailed review of commercially available charged particle detectors was completed and a ruggedized silicon surface barrier SSB detector was selected for use in the engineering prototype field water radioactivity monitor FWRM. A review of the fission products and daughter products was also conducted to identify the types and energies of particles of photons present in the environment after a bomb detonation. The review identified Sr-90Y-90 and Cs-137 as the more dangerous of the radionuclides present in the environment following an event. In the case of seeded bombs, it was determined that cobalt Co-60 is a dangerous element that must be considered for analysis in the design of the FWRM. Tests were conducted with both Cs-137 and Co-60 gamma ray backgrounds. Sr-90Y-90 was identified as the charged particle emitter that the FWRM would be designed to detect, since Sr-90Y-90 emits betas with average energies of 0.7 and 0.93 MeV and is representative of the range of beta energies from mixed fission products. Under the condition of a 100 mRhr Cs-137 field, the signal Sr-90 in water to noise Cs-137 background with electronic discrimination against low energy electrons created by background gamma rays was 100. Because of the much higher energies of gammas from C0-60, electrons created by gamma ray interaction in the water are much more energetic.

Subject Categories:

  • Nuclear Instrumentation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE