41Ca standardization by the CIEMAT/NIST LSC method

Barquero, L. Rodrı́guez; Arcos, J.M. Los

doi:10.1016/s0168-9002(96)80008-8

Cited by 21 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 H, 14 C, 60 Co, 152 Eu, etc. These results confirmed that the estimated values by calculation based on the history of operation of the JPDR were overestimated [11].…”

Section: Detection Efficiency In the X-ray Measurementsmentioning

confidence: 99%

“…The radioactive inventory of the concrete was estimated by calculation and its validity was verified by measuring mainly γ-ray-emitting radionuclides such as 60 Co, 134 Cs, 152 Eu, and 154 Eu [2]. Several other radionuclides, for example 3 H, 14 C, 41 Ca, 55 Fe, 63 Ni, were also important in the verification of the radioactive inventory. These nuclides decay emitting only β rays or X-rays and require tedious and time-consuming chemical separation from the other radionuclides before radiometric measurements.…”

Section: Introductionmentioning

confidence: 99%

“…These nuclides decay emitting only β rays or X-rays and require tedious and time-consuming chemical separation from the other radionuclides before radiometric measurements. Of these nuclides the long-lived 41 Ca, with a half-life of 1.0×10 5 years, which decays by electron capture (EC) and emits only X-rays and Auger electrons with very low energies below 3.6 keV [3], is very difficult to measure quantitatively by radiometric techniques because of strong self-absorption. In Japan, legislation stipulates that the maximum specific activity of 41 Ca allowed for simple disposal of concrete without any engineered barrier must be less than 1.5×10 8 Bq t -1 (150 Bq g -1 ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of 41Ca in biological-shield concrete by low-energy X-ray spectrometry

et al. 2002

View full text Add to dashboard Cite

An X-ray spectrometric method has been developed for the determination of 41Ca in the biological-shield concrete of nuclear reactors. The concrete sample was first decomposed with nitric, hydrofluoric, and perchloric acids. Calcium was then separated from other radionuclides by ion-exchange chromatography and recovered as an oxalate precipitate. X-rays at 3.3 keV from 41Ca in the calcium oxalate pellet were measured. The detection efficiency of the X-ray measurement at 3.3 keV was calculated from those obtained by measuring 55Fe standard pellets at 5.9 keV using mass-absorption coefficients of the calcium oxalate pellet at each X-ray energy. A lower limit of determination of 8 Bq g(-1) was obtained for a sample weight of 1 g.

show abstract

“…3 H, 14 C, 60 Co, 152 Eu, etc. These results confirmed that the estimated values by calculation based on the history of operation of the JPDR were overestimated [11].…”

Section: Detection Efficiency In the X-ray Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of 41Ca in biological-shield concrete by low-energy X-ray spectrometry

et al. 2002

View full text Add to dashboard Cite

show abstract

“…41 Ca is also used as a tracer in the biomedical research [145], which requires a very sensitive determination of 41 Ca because of the small sample size normally available. 41 Ca decays to the ground state of 41 K by pure electron capture, emitting X-rays and Auger electrons of very low energy (3.3 keV, 11.7%), which makes it possible, although difficult, to be measured by X-ray spectrometry [146] and LSC [19,[147][148]. X-ray spectrometry is a simple method, but it is insensitive due to the low counting efficiency (< 0.08%) of X-ray spectrometry for 41 Ca and the low abundance of X-rays from 41 Ca (11.4% for 3.31 keV K α X-ray).…”

Section: Chlorine-36mentioning

confidence: 99%

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

Hou

Roos

2008

Analytica Chimica Acta

342

253

View full text Add to dashboard Cite

Bone Seeking Labels as Markers for Bone Turnover: Effect of Dosing Schedule on Labeling Various Bone Sites in Rats

et al. 2009

View full text Add to dashboard Cite

Urinary excretion of bone labels can be used to monitor bone resorption. Here we investigate the effects of dosing frequency on label incorporation of various sites when bone turnover was perturbed by ovariectomy. We compared tritiated tetracycline ((3)H-TC) and (45)Ca in two studies. Nine-month-old rats were given single or multiple injections of (3)H-TC and (45)Ca and sacrificed after 7 or 14 days. Six-month-old OVX rats were given (3)H-TC and (41)Ca tracers 1 or 3 months following ovariectomy (OVX + 1 mo or OVX + 3 mo, when bone turnover was higher or lower, respectively) and sacrificed 1 week, 1 month, 3 months, or 6 months postdose. Twenty-four-hour urine pools over 2-4 consecutive days as well as the proximal tibia, femur midshaft, lumbar vertebrae (L1-L4), and remaining skeleton were analyzed for (3)H, (45)Ca, and calcium content. Bone turnover as assessed by urinary (3)H-TC was greater in OVX + 1 mo compared to OVX + 3 mo rats up to 6 months postdose. (45)Ca labeling efficiency (% dose/g Ca) was significantly higher than for (3)H and labeling was higher in trabecular-rich than cortical-rich bone. This study affirms that a single administration of either (3)H-TC or (45)Ca is a useful approach to measuring bone turnover directly. The amount of label incorporation into bone was greater in bone sites that were more metabolically active and in all sites when closer vs farther from OVX.

show abstract

41Ca standardization by the CIEMAT/NIST LSC method

Cited by 21 publications

References 11 publications

Determination of 41Ca in biological-shield concrete by low-energy X-ray spectrometry

Determination of 41Ca in biological-shield concrete by low-energy X-ray spectrometry

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

Bone Seeking Labels as Markers for Bone Turnover: Effect of Dosing Schedule on Labeling Various Bone Sites in Rats

Contact Info

Product

Resources

About