AUTOMATIC SYSTEM FOR REMOTE MEASUREMENTS OF GAMMA-RAY FIELD CHARACTERISTICS FOR ACCIDENT BUILDINGS

Citation
Sm. Ignatov et al., AUTOMATIC SYSTEM FOR REMOTE MEASUREMENTS OF GAMMA-RAY FIELD CHARACTERISTICS FOR ACCIDENT BUILDINGS, Instruments and experimental techniques, 41(4), 1998, pp. 569-573
Citations number
10
Categorie Soggetti
Instument & Instrumentation",Engineering
ISSN journal
00204412
Volume
41
Issue
4
Year of publication
1998
Pages
569 - 573
Database
ISI
SICI code
0020-4412(1998)41:4<569:ASFRMO>2.0.ZU;2-I
Abstract
An automatic gamma-locator was developed for measuring the Cs-137 surf ace activity inside the reactor hall of the destroyed fourth unit of t he Chernobyl Nuclear Power Plant. The gamma-locator consists of two co llimated scintillation detectors mounted on scanning devices and a con trol unit connected by the detectors with 200-m-long coaxial cables. T he energy resolution of the detectors is similar to 8% for Cs-137 (662 keV). The gamma-locator measures the surface activity of the Cs-137-r adionuclide contamination in the 3.7 x 10(6)-3.7 x 10(12)-Bq/m(2) rang e. Each detector is equipped with a TV-camera to observe an object und er investigation. For measuring the distances from the detector to the radiating surface, one of the detectors has a laser range finder and the other one has a laser pointer. The software makes it possible to d etermine the surface activity of radiation sources and to compute the distribution of the effective-dose rate from the spectra measured in t he accident building.