Americium-241 as a low-energy photon intensity standard

Campbell, J. A.; McNelles, L.A.

doi:10.1016/0029-554x(74)90301-2

Cited by 52 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the low-energy range the full-energy peak efficiencies of the used detectors were determined with the X-ray and 7-ray intensities of 241Am [28], 57Co [29], x69yb [30], 133Ba [31] and 15ZEu [25,32] whereas in the high-energy range the full-energy, single-escape, and double-escape peak efficiencies were determined with 7-ray lines from the reactions 14N(n, 7)tSN [33] and 53Cr(n, 7)54Cr [34]. The 7-7 angular correlation measurements have been performed with a three-detector arrangement shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Gamma spectroscopic study of105Ru

1978

View full text Add to dashboard Cite

The 7 radiation following thermal neutron capture in ~~ has been investigated through singles, coincidence, and angular correlation measurements in order to solve existing discrepancies and to complete the knowledge about the transitional odd-N nucleus lo5~.The resulting level and 7-decay scheme is found to be very similar to 441~u61 9that of the odd-Z transitional nucleus 149P_61_mss. Between the 11/2-, 15/2-, and 19/2states which are interpreted as members of the decoupled band, built on the unique parity 11/2-single particle state, low spin states of negative parity are found at surprisingly low excitation energies above the 11/2-state. In the frame of the particleplus-rotor model their positions would require a sharp decrease of the rotational parameter with increasing collective angular momentum of the soft core.

show abstract

Section: Methodsmentioning

confidence: 99%

Gamma spectroscopic study of105Ru

1978

View full text Add to dashboard Cite

show abstract

“…6 mounted Si(Li) detector operating in anticoincidence with two large NaI(Tl) scintillators, one on each of its two sides. This configuration yields 2-4 times the sensitivity of a conventional Si(Li) spectrometer having an equal size detector.…”

Section: Discussionmentioning

confidence: 99%

Measurement of Trace Radionuclides in Soil by L X-Ray Spectrometry

Sherman

Strauss²,

Pehl³

1980

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

L x-ray spectrometry is shown to be a promising cost efficient technique for assaying several radionuclides in soil simultaneously without prior chemical separation. Analysis is performed with a unique Si(Li)-NaI(Tl) spectrometer. The Si(Li) detector, with thin windows on both surfaces, is mounted on its edge to permit counting x rays from two samples simultaneously. With a thin soil sample on each of its sides this detector is sandwiched between two large NaI(Tl) scintillators. When the Si(Li) detector is operating in anticoincidence with the NaI(Tl) crystals the y background in the x-ray spectrum is reduced by 50%. Thus, this spectrometer has four times the sensitivity of a conventional Si(Li) spectrometer. Initial measurements were made with a prototype spectrometer consisting of a 3 cm2 Si(Li) detector having a resolution of 350-400 eV and two 5"x4" NaI(Tl) scintillators. A 30 cm2 Si(Li) detector array with two 12"x6" NaI(Tl) crystals is under development. Measurements of Pu in soil containing 24lAm, from Rocky Flats, and Pu in soil containing 137Cs, from a waste-discharge site, are in good agreement with radiochemical measurements. Activity as low as 1 pCi/g of the natural U and Th in soil has been measured. With the array the minimum detectable Pu activity is expected to be 1 pCi/g which corresponds to a concentration of 10-7 -10-5 ppm by weight.

show abstract

“…However, PPCGe detectors have a dead layer at the surface caused by lithium diffusion. Events generated in the dead layer will lead to a slow rise time pulse and an incomplete charge collection because of the very weak electric field in this region [5][6][7]. Burns et al found that the dead layer was composed of two layers: an inactive layer where no charge can be collected by the electrodes, and a transition layer where the charge collection efficiency increases from zero to one [8].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the dead layer thickness in a p-type point contact germanium detector

Jiang

Yue

et al. 2016

Chinese Phys. C

View full text Add to dashboard Cite

A 994g mass p-type PCGe detector was deployed by the first phase of the China Dark matter EXperiment aiming at the direct searches of light weakly interacting massive particles. Measuring the thickness of the dead layer of a p-type germanium detector is an issue of major importance since it determines the fiducial mass of the detector. This work reports a method using an uncollimated 133 Ba source to determine the dead layer thickness. The experimental design, data analysis and Monte Carlo simulation processes, as well as the statistical and systematic errors are described. An agreement between the experimental data and simulation results was achieved to derive the thickness of the dead layer of 1.02 mm.

show abstract

Americium-241 as a low-energy photon intensity standard

Cited by 52 publications

References 33 publications

Gamma spectroscopic study of105Ru

Gamma spectroscopic study of105Ru

Measurement of Trace Radionuclides in Soil by L X-Ray Spectrometry

Measurement of the dead layer thickness in a p-type point contact germanium detector

Contact Info

Product

Resources

About