Measurement of radiocesium in Irish peatland soils

McGee, E.J.; Synnott, H.J.; Colgan, P.A.

doi:10.1007/bf02164259

Journal of Radioanalytical and Nuclear Chemistry Letters

1992

DOI: 10.1007/bf02164259

|View full text |Cite

Measurement of radiocesium in Irish peatland soils

E.J. McGee

H.J. Synnott

P.A. Colgan

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

1994

2000

Publication Types

Select...

Article3

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Romania the biggest deposits were measured for the country center (Transylvania) [2, 3], some of these being higher than 20 kBq/m 2 [3]. The cesium deposits have been measured during 1986 and some years after the disaster, for undisturbed soils, using high resolution gamma spectrometry and cesium standards for volume samples [4,5]. The absence of volume standards in the immediate period following the Chernobyl accident, imposed the necessity to utilize in some laboratories the point sources for the calibration of the measuring equipment [6,7].…”

mentioning

confidence: 99%

Calibration of NaI(TI) spectrometer for radiocesium volume-samples. Some results from Transylvania region

et al. 1999

View full text Add to dashboard Cite

A four-channel NP-424 type gamma analyzer coupled with a large NaI(T1) scintillator was calibrated using a 137Cs point source. The volume-samples were plexiglas cylindrical boxes (D = 76mm, H = 40mm) directly placed on the NaI(T1) detector. Measurements for 64 indoor positions at full-662 keV-peak were made. Sample selfabsorbtion was determined considering a linear attenuation for gamma rays and measuring the absorption factor for maximum thickness of the volume sample (ho = 40mm). The obtained results for two types of environmental samples (soil and milk-powder) are compared with the data acquired from other Romanian laboratories, in the frame of the Environmental Radioactivity Action (ERA) which standardized such types of measurements. The same samples were measured with a calibrated GeLi detector (INAN -Louvain la Neuve) and the results were in good agreement with our measurements. Using this NaI(T1) calibrated spectrometer some radiocesium deposits (56 localities) from Transylvanian region were measured. The results show that a large deposit exists in the direction NE-SW in connection with the radioactive cloud passing. For Alba region were measured more than 40 kBq/m 2 of cesium deposit. IntroductionAfter the Chernobyl accident, a diversity of 137Cs deposits were found in different countries [1]. In Romania the biggest deposits were measured for the country center (Transylvania) [2, 3], some of these being higher than 20 kBq/m 2 [3]. The cesium deposits have been measured during 1986 and some years after the disaster, for undisturbed soils, using high resolution gamma spectrometry and cesium standards for volume samples [4,5]. The absence of volume standards in the immediate period following the Chernobyl accident, imposed the necessity to utilize in some laboratories the point sources for the calibration of the measuring equipment [6,7]. The use of large NaI(T1) detectors for radiocesium deposits measurements is advantageous, due to their high efficiency, but in some situations because of the their low resolution a special attention is necessary to remove other interferences in the 662 keV energy peak. In our case, the radon from the soil (610 keV), leads to the growth of the peak width, especially for the left hand side of the photopeak. The heating of the samples before measuring removes this contribution [8]. The energy peak of 134Cs (605 keV) can also contribute to the peak width. In this work a large NaI(T1) detector ((I) = 76 mm, Ho = 45 mm) using a 137Cs point standard was calibrated in order to simulate a cylindrical volume sample (D = 76 mm, H = 40 mm).The results of calibration for two different samples (soil and milk-powder) were compared with the results from other laboratories in Romania and Belgium (INAN-

show abstract

mentioning

confidence: 99%

Calibration of NaI(TI) spectrometer for radiocesium volume-samples. Some results from Transylvania region

et al. 1999

View full text Add to dashboard Cite

show abstract

Environmental radiochemistry and radioactivity a current bibliography

Bujdosó

1994

Journal of Radioanalytical and Nuclear Chemistry, Articles

View full text Add to dashboard Cite

Long-Term Trends of Radiocesium Activity Concentrations in Vegetation in Irish Semi-Natural Ecosystems

Hj¹,

Ej²,

Rafferty³

et al. 2000

Health Physics

View full text Add to dashboard Cite

137Cs activity concentrations were determined in vegetation from four Irish blanket bog ecosystems during the summer months of 1989-1997. The dominant and abundant vegetation species were sampled at each site and the data were used to estimate long-term trends of 137Cs activity concentrations. A general decline in the 137Cs activity concentrations in vegetation was observed from all sites sampled. The fastest and most consistent long-term rates of 137Cs decline were observed in the bryophyte and lichen vegetation group with 137Cs effective half-life (T ef) values of 2.2 to 10.7 y. The ericoid group with the exception of one case also showed a significant long-term decline in 137Cs activity concentrations with T ef values of 3.5 to 12.4 y as did the rush species Juncus squarrosus (T ef range 9.3 to 12.8 y). The sedge and grass groups showed the slowest and the least consistent rates of 137Cs decline, with T ef values of 2.9 to 59.8 y. Preliminary evaluation of 137Cs activity concentrations in sheep from some of the studied sites suggests that the decline found in vegetation is reflected in sheep.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Measurement of radiocesium in Irish peatland soils

Cited by 3 publications

References 9 publications

Calibration of NaI(TI) spectrometer for radiocesium volume-samples. Some results from Transylvania region

Calibration of NaI(TI) spectrometer for radiocesium volume-samples. Some results from Transylvania region

Environmental radiochemistry and radioactivity a current bibliography

Long-Term Trends of Radiocesium Activity Concentrations in Vegetation in Irish Semi-Natural Ecosystems

Contact Info

Product

Resources

About