The technical details and performance of the newly developed Sandwich spectrometer for ultra low-level gamma-ray spectrometry are presented. The spectrometer, which consists of two HPGe detectors, an active muon shield and a lead/copper shield with a convenient and rapid opening mechanism, is located in an underground laboratory at a depth of 500 m water equivalent. The data is collected in lis...

Gamma-ray spectrometry measurements performed on site, or “in situ”, is a widely used and powerful method that can be employed both to identify and quantify ground deposited radionuclides. The purpose of this thesis is to improve the calibration of high purity germanium (HPGe) detectors for in situ measurements, and calculate the combined uncertainty and potential systematic effects. An improve...

We are developing low-temperature detectors for optical, ultraviolet, X-ray, and gamma-ray spectroscopy, and for biomolecular mass spectrometry. We present here a survey of our recent work in developing these detectors and some of the first results in applying these detectors for materials analysis and biomolecular mass spectrometry. We have measured thin-film Nb/Al/Al2O3/Al/Nb superconducting ...

The radioactive isotope beam (RIB) of 25Na at 5MeV/u energy in maximum 3x107 pps intensity was fired on a deuterated polyethylene (CD2) to investigate mainly (d,p gamma) reaction. However, there were other reaction possibilities, which arisen from the same collision, be eliminated wisely. As particle detector and gamma-ray detector, highly selective double-sided silicon strip detectors (DSSSD) ...

Gamma-ray spectrometry is a very powerful tool for radioactivity measurements. The gamma-ray spectrometer laboratory in Centre for Energy Research and Training (CERT), Ahmadu Bello University, Zaria, Nigeria is accredited to perform measurements of radioactive content of samples collected from the environment, food chain or industrial products with the aid of a high resolution HPGe detector. Fo...

Abstract The Joint Research Centre, in cooperation with the Commissariat à l’Energie Atomique et aux Energies Alternatives, produced a novel 243 Am spike reference material for mass spectrometry. Americium solution an isotopic composition of 88% and 12% 241 was used as source preparation material. certified value 5.696 (11) nmol g −1 amount content 0.136138 (54) n ( Am)/ Am) ratio were assigned...

Natural radionuclides present in soil as well as certain anthropogenic radionuclides released to the environment are the major contributors to terrestrial outdoor exposures. In the assessment of human exposures from environmental radioactivity, besides the conventional method of soil and vegetation sampling combined with laboratory based analyses of environmental media, the other choice would b...

Abstract The evaluation of minimum detectable activity (MDA) for a radionuclide in gamma-ray spectrum is generally carried out through the computation suitable background count. This task sometimes difficult complex spectra presence many photopeaks which make trend continuum extremely variable due to multiple dispersion effects and interference factors. It follows that MDA assessment must be ta...