Improvement of the technique for stack monitoring based on behavior analysis of natural radio-nuclides; The technique for reducing the value of the exhaust monitor's background

Izaki, Kenji; Noda, Kimio; ; Kashimuta, Yoshio*

JNC TN8410 2001-005, 30 Pages, 2001/01

JNC-TN8410-2001-005.pdf:0.62MB

Stack monitoring is the most important work in radiation control works. Exhaust monitors used for stack monitoring have the background (which is the counts by natural radio-nuclides) on normal condition, and the values of the background vary with the facilities. Therefore, if the value of background is high, it is difficult to estimate rapidly the radioactive concentration in the exhaust. In order to estimate rapidly the radioactive concentration in exhaust, we analyzed the behavior of natural radioactivity in the facilities and examine the technique fo reducing the value of the background. As a result of the examination, we found that it is possible to estimate rapidly if we change over the monitoring point to immediately after the HEPA filters on the exhaust duct. In this reports, the analyzed results of behavior of natural radio-nuclides in the facilities and the technique for reducing the values of the background are described. To reduce the value of the background has a major effect on not only rapidly estimating the radioactive density in the exhaust but also finding the unusual things on stack monitoring.

None

*

JNC TJ7440 99-008, 58 Pages, 1999/02

JNC-TJ7440-99-008.pdf:0.13MB

no abstracts in English

None

*; *

PNC TJ1630 97-001, 37 Pages, 1997/03

PNC-TJ1630-97-001.pdf:1.5MB

no abstracts in English

None

PNC TJ1647 97-001, 131 Pages, 1997/02

PNC-TJ1647-97-001.pdf:2.29MB

no abstracts in English

None

PNC TJ1615 94-001, 9 Pages, 1994/03

PNC-TJ1615-94-001.pdf:0.27MB

no abstracts in English

None

PNC TJ1545 94-002, 139 Pages, 1994/03

PNC-TJ1545-94-002.pdf:4.33MB

no abstracts in English

Survey on the behavior of radioactive substance in the atmosphere

*

PNC TJ1545 92-005, 51 Pages, 1992/03

PNC-TJ1545-92-005.pdf:1.23MB

no abstracts in English

Sudy on main causes of changes in environmental radiation levels

Nuclear Safety Technology Center*

PNC TJ1545 91-001, 260 Pages, 1991/03

PNC-TJ1545-91-001.pdf:7.6MB

no abstracts in English

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 3; Distinction between natural and artificial radioactive nuclides using KURAMA-II

Ando, Masaki; Saito, Kimiaki; Matsuda, Norihiro

no journal, , 

To evaluate contribution of natural radioactive nuclides to the air dose rate measured by car-borne survey in relatively low air dose range, a rapid method to distinguish natural radioactive nuclides was applied to a car-borne survey system KURAMA-II, and the availability was evaluated.