Environmental Gamma Radiation and Natural Radioactivity in Soils in Centro Experimental Aramar (CTMSP-BRAZIL) and Region

AbstractThe measurements of activity concentrations in soil of the lignite belt and soil of the villages surrounding the lignite belt have been carried out in order to present the radiological health hazards due to gamma radiation levels of the soil to general public. A low- background Pb-shielded gamma spectroscopic counting assembly utilizing NaI(Tl) detector was employed for the measurements. The activity concentration of radionuclides have been determined and compared with the international and national recommended values. A correlation analysis was also performed in order to predict the contribution of the respective nuclides towards the measured dose rate and to the find the existence of these radioactive nuclides together in the study area.

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Natural radioactivity and external gamma radiation exposure at the coastal Red Sea in Egypt

Radiation Protection Dosimetry ◽

10.1093/rpd/ncn064 ◽

2008 ◽

Vol 130 (3) ◽

pp. 376-384 ◽

Cited By ~ 38

Author(s):

S. Harb

Keyword(s):

Gamma Radiation ◽

Radiation Exposure ◽

Red Sea ◽

Natural Radioactivity

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Assessment of Gamma Radiation Exposure Inside a Newly Constructed Building and a Proposed Regulatory Guideline for Exposure Control from Natural Radioactivity in Future Buildings

Radiation Protection Dosimetry ◽

10.1093/oxfordjournals.rpd.a082643 ◽

1995 ◽

Vol 59 (2) ◽

pp. 127-133 ◽

Cited By ~ 7

Author(s):

V.K. Shukla ◽

S. Sadasivan ◽

V.K. Sundaram ◽

K.S.V. Nambi

Keyword(s):

Gamma Radiation ◽

Radiation Exposure ◽

Natural Radioactivity ◽

Exposure Control ◽

Regulatory Guideline

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Natural radioactivity distribution and gamma radiation exposure of beach sands from Sithonia Peninsula

Open Geosciences ◽

10.2478/s13533-012-0157-0 ◽

2014 ◽

Vol 6 (2) ◽

Cited By ~ 5

Author(s):

Argyrios Papadopoulos ◽

Georgios Christofides ◽

Antonios Koroneos ◽

Stylianos Stoulos

Keyword(s):

Gamma Radiation ◽

Effective Dose ◽

Natural Radioactivity ◽

Annual Effective Dose ◽

Granitic Rocks ◽

Rock Types ◽

Activity Concentrations ◽

Plutonic Complex ◽

Parent Rocks ◽

Beach Sands

AbstractThis study aims to evaluate the activity concentrations of 238U, 226Ra, 232Th, 228Th and 40K along the beaches of Sithonia Peninsula which are adjacent to the rock-types of the Sithonia Plutonic Complex. These range from 6–673, 5–767, 5–1750, 6–1760 and 185–875 Bq/kg respectively. The (% wt.) heavy magnetic (HM) fraction (epidote, allanite, hornblende, biotite and garnet), the heavy non-magnetic (HNM) fraction (monazite, zircon, titanite and apatite) and the total heavy (TH) fraction, were correlated with the concentrations of the measured radionuclides in the bulk samples. The HNM fraction seems to control the activity concentrations of 238U in all samples, while the HM fraction, at least for the heavy mineral rich samples bearing high amounts of epidote crystals with allanite cores, controls their 232Th content. The measured radionuclides in beach sands were normalized to the respective values measured in the granitic rocks, which are their most probable parent rocks, in order to provide data on their enrichment or depletion. The annual effective dose varies from 0.013 to 0.688 mSv y−1 for local people working on the beach, while for tourists the annual external effective dose ranges between 0.003 and 0.165 mSv y−1.

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External gamma radiation levels and natural radioactivity in soil around a phosphate fertilizer plant at Mumbai

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-014-2941-4 ◽

2014 ◽

Vol 300 (1) ◽

pp. 23-27 ◽

Cited By ~ 12

Author(s):

P. Y. Ajmal ◽

R. C. Bhangare ◽

M. Tiwari ◽

S. K. Sahu ◽

G. G. Pandit

Keyword(s):

Gamma Radiation ◽

Natural Radioactivity ◽

Phosphate Fertilizer ◽

Fertilizer Plant

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Measurement of natural radioactivity and dose rate assessment of terrestrial gamma radiation in the soil of southern Punjab, Pakistan

Radiation Protection Dosimetry ◽

10.1093/rpd/ncm310 ◽

2007 ◽

Vol 128 (2) ◽

pp. 206-212 ◽

Cited By ~ 37

Author(s):

I. Fatima ◽

J. H. Zaidi ◽

M. Arif ◽

M. Daud ◽

S. A. Ahmad ◽

...

Keyword(s):

Gamma Radiation ◽

Dose Rate ◽

Natural Radioactivity

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Natural radioactivity distribution and gamma radiation exposure of beach sands close to Kavala pluton, Greece

Open Geosciences ◽

10.1515/geo-2015-0043 ◽

2015 ◽

Vol 7 (1) ◽

Cited By ~ 5

Author(s):

Argyrios Papadopoulos ◽

Antonios Koroneos ◽

Georgios Christofides ◽

Stylianos Stoulos

Keyword(s):

Gamma Radiation ◽

Radiation Exposure ◽

Natural Radioactivity ◽

Activity Concentrations ◽

Beach Sands ◽

Radioactivity Distribution

AbstractThis study aims to evaluate the activity concentrations of

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Effects of sterilization modes on the mechanical strengths of plaster of paris implants

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100156432 ◽

1989 ◽

Vol 47 ◽

pp. 890-891

Author(s):

K. Cowden ◽

B. Giammara ◽

T. Devine ◽

J. Hanker

Keyword(s):

Gamma Radiation ◽

Calcium Sulfate ◽

Significant Loss ◽

Potassium Sulfate ◽

Limiting Factors ◽

Radiation Sterilization ◽

Plaster Of Paris ◽

Hardness Tester ◽

Dry Heat ◽

Calcium Sulfate Hemihydrate

Plaster of Paris (calcium sulfate hemihydrate, CaSO4. ½ H2O) has been used as a biomedical implant material since 1892. One of the primary limiting factors of these implants is their mechanical properties. These materials have low compressive and tensile strengths when compared to normal bone. These are important limiting factors where large biomechanical forces exist. Previous work has suggested that sterilization techniques could affect the implant’s strength. A study of plaster of Paris implant mechanical and physical properties to find optimum sterilization techniques therefore, could lead to a significant increase in their application and promise for future use as hard tissue prosthetic materials.USG Medical Grade Calcium Sulfate Hemihydrate Types A, A-1 and B, were sterilized by dry heat and by gamma radiation. Types A and B were additionally sterilized with and without the setting agent potassium sulfate (K2SO4). The plaster mixtures were then moistened with a minimum amount of water and formed into disks (.339 in. diameter x .053 in. deep) in polyethylene molds with a microspatula. After drying, the disks were fractured with a Stokes Hardness Tester. The compressive strengths of the disks were obtained directly from the hardness tester. Values for the maximum tensile strengths σo were then calculated: where (P = applied compression, D = disk diameter, and t = disk thickness). Plaster disks (types A and B) that contained no setting agent showed a significant loss in strength with either dry heat or gamma radiation sterilization. Those that contained potassium sulfate (K2SO4) did not show a significant loss in strength with either sterilization technique. In all comparisons (with and without K2SO4 and with either dry heat or gamma radiation sterilization) the type B plaster had higher compressive and tensile strengths than that of the type A plaster. The type A-1 plaster however, which is specially modified for accelerated setting, was comparable to that of type B with K2SO4 in both compressive and tensile strength (Table 1).

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