共查询到20条相似文献,搜索用时 46 毫秒
1.
K. J. Ellis S. H. Cohn A. Vaswani I. Zanzi M. Roginsky J. Aloia 《Journal of Radioanalytical and Nuclear Chemistry》1977,37(1):333-343
Total body neutron activation analysis (TBNAA) has used to determine the absolute levels of total body sodium (TBNa) and total
body chlorine (TBCl) in 81 normal adults. For the age span studied (30–90 years), the mean values of TBNa and TBCl remained
relatively constant for males, but decreased slightly for females beyond sixty years of age. In order to reduce the variability
in this cross-sectional study, the TBNa and TBCl values were normalized for body dimensions (weight, height, body surface
area) as well as age and sex. In addition, TBNa was related to skeletal mass (total body calcium) and lean body mass (total
body potassium). The quantity of body sodium in excess of the chlorine space was determined. This value, defined as sodium
excess, was significantly correlated with total body calcium. The values for total body sodium, total body chlorine, and sodium
excess obtained in the present study were compared with values previously reported in the literature. 相似文献
2.
Primal D’Cunha P. Sathyanarayana Bhat Y. Narayana 《Journal of Radioanalytical and Nuclear Chemistry》2011,290(1):171-174
The paper presents systematic studies on the vertical profiles of 210Po, an important decay product of 238U, in soils along coastal Kerala. Soil samples collected from different depth intervals 0–10, 10–20, 20–30 cm were analyzed
for 210Po activity concentration by radiochemical methods. The activity 210Po in soil samples were counted using a ZnS(Ag) alpha scintillation counting system. The mean values of activity concentrations
of 210Po in soil of various depths were found to be 8.66, 5.63 and 4.95 Bq kg−1 for depth intervals of 0–10, 10–20 and 20–30 cm, respectively. The overall activity concentration of 210Po in soil was found to vary from 2.26 ± 0.19 to 14.02 ± 0.12 Bq kg−1 with a mean value of 6.43 Bq kg−1. Maximum activity concentration was found in soil samples of Kollam region with the mean value of 10.08 ± 0.92 Bq kg−1. The activity of 210Po was found to be comparatively high in surface soil. The variation of 210Po activity concentration with organic matter contents was studied. 210Polonium activity concentration was found to increase with increasing organic matter content. 相似文献
3.
Cesium and potassium were determined in muscle-tissues of squid, dover sole, albacore, and bocaccio by NAA. Potassium was
measured instrumentally, while cesium was radio-chemically separated. For the separation of cesium, hydrated antimony pentoxide
(HAP) was used to retain24Na, and ammonium molybdophosphate (AMP) was used to absorb quantitatively the radiocesium,134mCs. The cesium and potassium contents were based on measuring the short-lived radionuclide of cesium, 2.90 h-134mCs, and 12.4 h-42K. The mean concentrations of cesium found, based on 3–4 replicate measurements for each fish, were: 4.18±0.32 ng/g squid,
11.51±0.30 ng/g dover sole, 43.64±1.03 ng/g albacore, and 56.85±3.61 ng/g bocaccio. The mean concentrations of potassium found
were: 1.28±0.10 mg/g squid, 2.78±0.29 mg/g dover sole, 3.69±0.06 mg/g albacore, and 4.18±0.10 mg/g bocaccio. 相似文献
4.
We have examined several whole body counting geometries for exclusive use in total body potassium (TBK) measurements in preterm infants. This paper describes two counters, one for very-low-birth-weight (VLBW) infants with body weights under 2000 g, and a second counter for larger preterm infants. Both systems use large-volume NaI(Tl) detectors (10.2 cm × 10.2 cm × 45.7 cm) and are operated in a low background room. The standard error for a TBK measurement decreases from 5% at 1 kg body weight to 2% at 4.5 kg weight. 相似文献
5.
Abdulrahman Abdul-Hadi Wedad Al-Qadhi Enayat El-Zeen 《Journal of Radioanalytical and Nuclear Chemistry》2011,290(2):261-266
Uranium, thorium and potassium contents in 16 different rock samples from various sites in Republic of Yemen were determined
using three different techniques of analysis: γ-spectrometry, Instrumental neutron activation analyses (INAA) and X-ray fluorescence
(XRF). The concentration range for thorium, uranium and potassium were found to be from 9,810 ± 272 to 3.6 ± 1.3 ppm, 1,072 ± 40
to 1.2 ± 0.7 ppm and 11 ± 1 to 0.26 ± 0.05%, respectively. 相似文献
6.
Mei Wo Yii Zal U’yun Wan Mahmood Zaharudin Ahmad Nurrul Assyikeen Md. Jaffary Kamaruzaman Ishak 《Journal of Radioanalytical and Nuclear Chemistry》2011,289(3):653-661
Study for distribution of Naturally Occurring Radioactive Materials (NORM) i.e. 226Ra, 228Ra and 40K in the east coast of Peninsular Malaysia Exclusive Economic Zone (EEZ) was carried out as part of the national marine environment
project. Sixteen marine sediment cores from selected locations within the EEZ were collected for determination of NORM activity
concentrations using high-purity germanium (HPGe) gamma spectrometer. From the measurement, the activity concentration of
226Ra, 228Ra and 40K is ranged from 16 ± 4 Bq/kg to 46 ± 6 Bq/kg (total mean 30), 28 ± 7 Bq/kg to 87 ± 11 Bq/kg (total mean 56) and 171 ± 33 Bq/kg
to 690 ± 89 Bq/kg (total mean 420), dry wt., respectively. The activity concentrations of radionuclides in most of the core
were quite uniform suggesting that there were thorough vertical mixed of sediment throughout the core. The results obtained
were also in good agreement with those previous reported from other countries in the region and therefore can be used to enhance
present radioactivity database. The calculated external hazard values were ranged from 0.25 to 0.51 with the mean of 0.38
(less than unity) showed little risk of external hazard to the workers handling the sediments and it was likely low level
of the mainland natural gamma-radiation in the east coast of Peninsular Malaysia. 相似文献
7.
《Spectrochimica Acta Part B: Atomic Spectroscopy》2005,60(5):699-703
The determination of chromium (VI) compounds in plants by electrothermal atomic absorption spectrometry (ET AAS) is proposed based on their leaching with 0.1 M Na2CO3. Due to the presence of relatively high amounts of Na2CO3 in the resulting samples, the temperature and time of pyrolysis and atomization stages must be optimized to minimize the influence of the matrix. A limit of detection (LOD) for determination of Cr(VI) in plants by ET AAS was found to be 0.024 μg g−1.The concentration of Cr(VI) and total chromium in plants collected in different geographical areas (South Africa and Russia), grown on soils high in chromium was determined. The concentration of Cr(VI) and total Cr in stems and leaves of plants was in the range of 0.04–0.7 μg g−1 and 0.5–10 μg g−1, respectively. The limited uptake of Cr(III) by plants, in comparison to its concentration in soil, can be explained by the very low solubility of natural Cr(III) compounds.Results for the determination of Cr(VI) were confirmed by the analysis of BCR CRM 545 (Cr(VI) in welding dust) with good agreement between certified (39.5 ± 1.3 μg mg−1) and found (38.8 ± 1.2 μg mg−1) values. The total concentration of Cr in plants has also been determined by ET AAS after dry ashing of samples at 650 °C. Results were confirmed by the analysis of BCR CRM 281 (Trace elements in Rye Grass) with good agreement between the found (2.12 ± 0.16 μg g−1) and certified value (2.14 ± 0.12 μg g−1). 相似文献
8.
S. F. Chiu P. C. Wang P. F. Kao J. B. Lin D. B. Lin C. Y. Chen 《Journal of Radioanalytical and Nuclear Chemistry》2011,289(3):873-882
Hair samples from junior high school students in metropolitan areas of Taichung, Taiwan were tested for a total of 13 elements,
Al, Ag, Br, Cl, Cr, Fe, K, La, Mn, Na, Sc, Se, and Zn by instrumental neutron activation analysis (INAA) to establish seasonal
variations, gender and environmental exposures. The seasonal variations of hairs in 39 healthy students (18 males and 21 females;
age 13.3 ± 0.4 years; height, 158.0 ± 4.1 cm; weight, 53.4 ± 5.7 kg) were collected at 1.5-month intervals for 1 year starting
from late August, 2008. The concentrations of the above elements varied from 103 to 10−2 μg g−1 at different sampling times. A quantified index of agreement (AT) was introduced to help classify the elements. A smaller
AT indicated highly consistent quantities of specific metals in the hair while a larger AT indicated increased fluctuation,
i.e., less agreement. The different ATs in various hair samples were discussed. The concentrations of these elements are compared
with the data in the literature. 相似文献
9.
Naskar Nabanita Lahiri Susanta Chaudhuri Punarbasu 《Journal of Radioanalytical and Nuclear Chemistry》2019,322(1):11-17
The present study attempts to quantitatively estimate total potassium content in soil samples collected from different areas of Indian Sundarbans by gamma-spectrometry, exploiting the radiogenic properties of potassium and by wavelength dispersive X-ray fluorescence technique. The elemental K concentration varied in between 2.08 ± 0.05 and 3.46 ± 0.06% in the soil samples. Besides estimation of total potassium, the activity of 40K was also estimated in the same soil samples and found to be in the range of 532 ± 8.9 to 1043 ± 13.2 Bq kg−1.
相似文献10.
《印度化学会志》2023,100(9):101063
The interactions between the polyphenol quercetin, Q, with three surfactant aggregates with different electric charges named micelles, were studied in aqueous solutions with pH values 4.7 and 7.0, to determine the following parameters: critical micellar concentration (CMC), micelle size and binding constant of the complex (Q-Micelle) proposing interaction sites for the formation of the complex. The surfactants used were: hexadecyltrimethyl ammonium bromide (cationic surfactant), CTAB, sodium dodecyl sulfate (anionic surfactant), SDS, and triton X-100 (non-ionic surfactant), TX100, used as Q fluorescence promoters to determine the CMC. The CMC values of the above surfactants at pH 4.7 were: 0.80 ± 0.10, 1.39 ± 0.07 and 0.59 ± 0.05 mM respectively, being lower than those reported in the water. With dynamic light scattering measurements, the hydrodynamic diameters of each micelle were calculated resulting in values of: 2.4 ± 0.5, 5.0 ± 1.1 and 8.4 ± 4.3 nm at pH 4.7 and: 2.1 ± 0.4, 4.9 ± 1.1 and 11.5 ± 4.1 nm at pH 7.0 respectively. In addition, the binding constants of the complex (Q-Micelle) with 1:1 stoichiometry were calculated from emission fluorescence data giving Log K values: 2.94 ± 0.02, 2.54 ± 0.02, and 3.63 ± 0.05 M-1 respectively. Finally, from the experimental data by UV–Vis spectrophotometry, the change in the behavior of the Q spectrum upon the addition of each of the surfactants to the system was analyzed, showing a decrease in absorbance when SDS and TX100 were added in an acidic medium, as a consequence of the photo-instability of the drug, suggesting that Q interacts with the outside of these micelles and is not fully incorporated inside them. 相似文献
11.
《Arabian Journal of Chemistry》2022,15(2):103541
Garcinia forbesii King belongs to Clusiaceae is a source of secondary metabolites especially xanthones with various biological activities. G. forbesii King is also known for its empirical use for malaria and diabetes. This study investigated the total phenolic and flavonoid contents, in vitro antioxidant, antidiabetic and antiplasmodial activities of four extracts attained from the stem bark of G. forbesii King. The total phenolic and flavonoid contents were determined by spectrophotometric methods and antioxidant activity was evaluated by DPPH, ABTS, FRAP assays. In vitro antidiabetic activity was assessed by α-glucosidase and α-amylase assays and antiplasmodial activity was studied against chloroquine sensitive Plasmodium falciparum strain 3D7. The highest value of total phenolic (187.37 ± 0.06 mg GAE/g) and flavonoid (35.97 ± 0.02 mg QE/g) contents were recorded in n-hexane and methanolic extracts. n-Hexane extract showed the highest DPPH activity with IC50 of 8.12 ± 0.02 μg/mL. Ethyl acetate extract exhibited better scavenging ability for ABTS with IC50 of 3.88 ± 0.04 μg/mL. The FRAP assay showed better activity in methanol extract with an inhibition value of 73.68 ± 3.66 µM Fe2+/g. The strong inhibition against α-glucosidase and α-amylase were displayed by dichloromethane extract with IC50 of 35.13 ± 2.01 μg/mL and 4.83 ± 0.20 μg/mL. n-Hexane and methanol extracts showed significant antiplasmodial activity with IC50 of 0.23 ± 0.01 μg/mL and 0.73 ± 0.01 μg/mL, respectively. The correlation analysis indicated a positive relationship of total phenolic and flavonoid contents with antiplasmodial activity. The results revealed that n-hexane and methanol extracts could be used as a potential natural antiplasmodial, while dichloromethane extract is a promising natural antidiabetic. 相似文献
12.
V. Zaichick 《Journal of Radioanalytical and Nuclear Chemistry》2009,281(1):41-45
The effect of age and gender on chemical element contents in intact crowns of permanent teeth of 84 apparently healthy 15–55 year
old women (n = 38) and men (n = 46) was investigated. Mass fractions of Ca, Cl, K, Mg, Mn, Na, P, and Sr in crowns were determined by instrumental neutron
activation analysis using short-lived radionuclides. Mean values (M ± SΕΜ) for female and male combined were (on dry weight
basis): 350 ± 5 g/kg, 2920 ± 150 mg/kg, 839 ± 80 mg/kg, 4880 ± 240 mg/kg, 3.20 ± 0.30 mg/kg, 6240 ± 140 mg/kg, 181 ± 4 g/kg,
and 293 ± 24 mg/kg respectively. A statistically significant decrease of Sr (P ≤ 0.01) and increase of Na (P ≤ 0.01) content in the tooth crowns with age was found for women. Sex-related comparison did not show any differences. 相似文献
13.
Valiollah Babaeipour Seyed Abbas Shojaosadati Rasoul Khalilzadeh Nader Maghsoudi Amir Mohammad Farnoud 《Applied biochemistry and biotechnology》2010,160(8):2366-2376
Development of inexpensive and simple culture media and appropriate induction conditions are always favorable for industry.
In this research, chemical composition and stoichiometric data for γ-interferon production and recombinant Escherichia coli growth were used in order to achieve a simple medium and favorable induction conditions. To achieve this goal, the effects
of medium composition and induction conditions on the production of γ-interferon were investigated in batch culture of E. coli BL21 (DE3) [pET3a-ifnγ]. These conditions were considered as suitable conditions for the production of γ-interferon: 2.5× M9 medium, supplemented
with a mixture of amino acids (milligram per liter), including glutamic acid 215, aspartic acid 250, lysine 160, and phenylalanine
90, and induction at late-log phase (OD600 = 4.5). Under these conditions, dry cell weight of 6 ± 0.2 g/l and γ-interferon concentration of 2.15 ± 0.1 g/l were obtained.
Later, without changing the concentration ratio of amino acids and glucose, the effect of increase in the primary glucose
concentration on productivity of γ-interferon was investigated. It was found that 25 g/l glucose will result in maximum attainable
biomass and recombinant human γ-interferon. At improved conditions, a dry cell weight of 14 ± 0.2 g/l, concentration and overall
productivity of γ-interferon 4.2 ± 0.1 g/l and 420 ± 10 mg/l h, respectively, were obtained. 相似文献
14.
Radon concentration in groundwater of Varahi and Markandeya river basins, Karnataka State, India 总被引:2,自引:0,他引:2
The present study presents an overview of the distribution of radon (222Rn) activity concentration in the groundwater samples and their annual effective dose exposure in the Varahi and Markandeya
command areas. Radon measurement was made using Durridge RAD-7 radon-in-air monitor, using RAD H2O technique with closed loop aeration concept. The measured 222Rn activities in 16 groundwater samples of Varahi command area ranged between 0.2 ± 0.4 and 10.1 ± 1.7 Bq L−1 with an average value of 2.07 ± 0.84 Bq L−1, well within the EPA’s maximum contaminant level (MCL) of 11.1 Bq L−1. In contrast, the recorded 222Rn activities in 14 groundwater samples of Markandeya command area found to vary from 2.21 ± 1.66 to 27.3 ± 0.787 Bq L−1 with an average value of 9.30 ± 1.45 Bq L−1. 21.4% of the samples (sample no. RMR5, RMR11 and RMR12) in the Markandeya command area exceeded the EPA’s MCL of 11.1 Bq L−1 and it was found that some samples in both the command areas were found to have radon values close to MCL value. The spatial
variation in the radon concentration in the Varahi and Markandeya command area were delineated by constructing the contour
map. The total annual effective dose resulting from radon in groundwater of both Varahi and Markandeya command areas were
significantly lower than the UNSCEAR and WHO recommended limit for members of the public of 1 mSv year−1. 相似文献
15.
《Arabian Journal of Chemistry》2021,14(11):103422
Oxidative stress has a crucial role in diabetic pathophysiology, therefore consuming naturally derived antioxidants as a remedial target. This study examines the naturally occurring antioxidant and antidiabetic of Olea europaea L. ethanolic leaves extract. Olea europaea L. leaves were macerated (OLE) by using absolute ethanol. Phytochemical and physiochemical analysis of OLE was screened using standard methods. The antioxidant effects were examined by DPPH (1, 1-diphenyl-2-picrylhydrazil) radical scavenging assay. In vitro antidiabetic was assayed by α-amylase enzyme inhibition study. Ethanolic extraction of OLE by maceration technique, 10% yield. Loss on drying, foreign organic matters and total ash value of OLE showed 2%, 0.2% and 16.5%, respectively. Phytochemical test on OLE confirmed saponin, flavonoid, glycoside, tannin, phenol and carbohydrate presences. The total phenolic and flavonoid contents of OLE is 490 mg GAE/g and 855 mg RUE/g of extract, respectively. OLE (IC50 38.37 ± 0.26 µg/ml) showed functional DPPH scavenging assay comparable to ascorbic acid (IC50 30.37 ± 0.17 µg/ml). In the alpha-amylase inhibitory activity, Acarbose showed an IC50 value of 20.06 ± 0.19 µg/ml, while OLE portrayed an IC50 value of 37.99 ± 0.15 µg/ml. The kinetic studies revealed that all samples at high concentrations reacted within a very short time, and a steady state was reached almost immediately. The lowest concentration showed slow kinetic behaviour implied longer periods before the constant state was reached. Molecular docking studies evidenced that most of the phenolic compounds of OLE interact with the active site of Human pancreatic α-amylase through the hydrogen bonding and hydrophobic interaction confirming the alpha-amylase inhibitory effect. The results suggest that Olea europaea L. has been a conceivable natural bioactive source as an antioxidant and an antidiabetic agent. 相似文献
16.
Juan Agüero José-Esteban Peris Eduardo San-Martín 《Fresenius' Journal of Analytical Chemistry》1999,363(3):289-293
An analytical method for detecting and quantifying cefotaxime in plasma and several tissues is described. The method was
developed and validated using plasma and tissues of rats. The samples were analyzed by reversed phase liquid chromatography
(HPLC) with UV detection (254 nm). Calibration graphs showed a linear correlation (r > 0.999) over the concentration ranges
of 0.5–200 μg/mL and 1.25–25 μg/g for plasma and tissues, respectively. The recovery of cefotaxime from plasma standards prepared
at the concentrations of 25 μg/mL and 100 μg/mL was 98.5 ± 3.5% and 101.8 ± 2.2%, respectively. The recovery of cefotaxime
from tissue standards of liver, fat and muscle, prepared at the concentration of 10 μg/g was: 89.8 ± 1.2% (liver), 103.9 ±
6.5% (fat) and 97.8 ± 2.1% (muscle). The detection (LOD) and quantitation (LOQ) limits for plasma samples were established
at 0.11 μg/mL and 0.49 μg/mL, respectively. The values of these limits for tissues samples were approximately 2.5 times higher:
0.3 μg/g (LOD) and 1.25 μg/g (LOQ). For plasma samples, the deviation of the observed concentration from the nominal concentration
was less than 5% and the coefficient of variation for within-day and between-day assays was less than 6% and 12%, respectively.
The method was used in a pharmacokinetic study of cefotaxime in the rat and the mean values of the pharmacokinetic parameters
are given.
Received: 25 May 1998 / Revised: 27 July 1998 / Accepted: 1 August 1998 相似文献
17.
The effect of age on trace element contents in rib bone of 24 healthy 16–55-year old men was investigated by INAA. Mean values
(M ± SΕΜ) for mass fraction of Co, Fe, Rb, Sr, and Zn (mg/kg on dry weight basis) were: 0.0030 ± 0.0005, 150 ± 20, 1.70 ± 0.30,
260 ± 30, and 76 ± 4, respectively. The upper limit of mean contents of Ce, Cs, Eu, Hg, and Se were: ≤0.03, ≤0.01, ≤0.001,
≤0.008, and ≤0.03, respectively. The contents of Ag, As, Au, Ba, Br, Cd, Cr, Gd, Hf, La, Lu, Nd, Sb, Sc, Sm, Ta, Tb, Th, U,
Yb, and Zr were under detection limits. No changes of trace element contents with age were found. 相似文献
18.
《印度化学会志》2023,100(1):100856
The present work aims to measure and estimate radioactivity and hazardous radiation indices of the soil. Soil samples were collected from various locations in the Visakhapatnam district in Andhra Pradesh, India. The measurement of specific activity of 226Ra, 232Th, and 40K radionuclides is carried out with the help of HP-Ge based gamma spectrometer system. Activity concentration of radionuclides in the samples 226Ra, 232Th and 40K ranged from 20 ± 2 to 91 ± 2 Bq.kg-1, 45 ± 3 to 365 ± 3 Bq.kg-1, and 400 ± 9 to 607 ± 8 Bq.kg-1, and the respective mean values are 53.36 Bq.kg-1, 203.74 Bq.kg-1 and 479.19 Bq.kg-1. The measured mean value of the absorbed dose rate is 171.41 nGy.h-1, which was beyond the worldwide mean outdoor value of 60 nGy.h-1. Thus, the annual effective dose estimated from the above value is 1.04 mSv.y-1. The correlation was done among the measured 226Ra, 232Th, and 40K activity concentrations. The estimated radium equivalent dose is 381.60Bq.kg-1. The estimated health hazard index and annual effective dose rates of dwellers of Visakhapatnam were studied and compared to Indian average values. The study will help to generate the baseline data for assessing hazard indices to the public and geological mapping of natural radiation in India. 相似文献
19.
《Arabian Journal of Chemistry》2021,14(11):103412
Grape plant (Vitis vinifera L.) is a species of the family Vitaceae. It is an economically important fruit plant abundantly grown all over the world. Vitaceae comprised of 900 species distributed across tropical, sub-tropical and partially temperate sorts of climatic zones. In the current study we aimed to evaluate the antioxidant activities of grape leaves extract from different Pakistani varieties.We have analyzed the crude methanolic extract from the leaves of Pakistani grape varieties (i.e. NARC Black, Sundar Khani, Shogran-1, Shogran-2, Haita, Sheghali, Perlette, and Sultania-C) cultivated in various soil compositions. Total phenolic contents (TPC) of the extract were determind by using Folin-ciocalteu reagent method. Total flavonoid contents (TFC) were determind by the Aluminum Chloride Calorimetric method. Antioxidant activities of the extracts of different concentration were evaluated using Phosphomolybdenum method, Reducing power and DPPH (2, 2-disphenyl-1-picryl-hydrazyl) assays. Assays performed for grape varieties showed great antioxidant potential. All varieties significantly depicted with variation in polyphenolic contents and antioxidant potential with changes in the soil conditions. The highest TPC and TFC were quantified in Shogran-1 97.58 ± 0.09 (GAE, g−1) and Sultania-C 97.47 ± 0.12 (µg QE/g DE) varieties respectively which were grown in (T6) and (T5), while lower were recorded in Sundar khani 5.16 ± 0.23 in (T6). Likewise, Shogran-1 128.26 ± 0.23 (µg AAE/g extract) variety grown in (T6) depicted highest total antioxidant capacity, NARC black 182.06 ± 0.24 (µg AAE/g extract) variety grown in (T6) resulted in maximum reducing power while DPPH free radical scavenging potential were determinded in Sultania-C 80.91 ± 0.10 (T4) equivalent µg/g. In the terms of bioassays, the promising results were showed by compost + sand + clay (T4), compost + clay + dung (T5) and sand + clay + dung (T6). Therefore, we conclude that variation in soil composition has a significant contribution in the quantity of phytochemicals and antioxidants expression. Our study further suggest that use of organic fertilizer (Compost) and loamy sort of soil enhance functioning of most of the varieties in terms of important phytochemicals. 相似文献
20.
Tee Lee Theng Zaharuddin Ahmad Che Abd Rahim Mohamed 《Journal of Radioanalytical and Nuclear Chemistry》2004,262(2):485-488
Polonium-210 has been measured in the soft parts of Anadara granosa purchased at Kuala Selangor, West Coast of Malaysia in August 2001, April 2002 and September 2002. It is shown that 210Po is non-uniformly distributed within cockles of various sizes (i.e., 2.5, 3.0, 3.5 and 4.0 cm of shell length) and the concentration
of 210Po in the soft parts of cockle was significantly different (p<0.05) due to sampling date. The highest value was observed in the smallest cockle with a shell length of 2.5 cm (411.6±26.16
Bq/g dry wt.). It is clear that there is an allometric relationship between 210Po activity concentration and individual cockle weight. This may reflect on the differences of metabolic rate and growth age
of cockles. The mean activity concentration of 210Po measured in Kuala Selangor filtered water were 1.75±0.17, 0.79±0.08 and 1.13±0.20 Bq/kg for August 2001, April 2002 and
September 2002, respectively. The yield concentration factors for 210Po in the soft parts of cockles varies from 27.3. 103 to 106.9. 103.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献