Modified Method for Efficiency Calibration of High Energy γ Detector

Diamond thin films have been deposited directly on stainless steel substrates at low pressure and low temperature conditions over the range of methane (CH4) to hydrogen (H2) ratios of 4% to 9% using electron-cyclotron-resonance microwave plasma-assisted chemical vapor deposition (PACVD) technique. In situ Fourier transform infrared spectroscopy, employed in a reflection-absorption geometry (FTIRRAS), and optical emission spectroscopy have been used to study the plasma species adsorbed on the substrate surfaces as well as the species above the substrates surfaces both before and during the nucleation and film growth. It is demonstrated that these techniques can provide useful information on the early stages of diamond growth. When correlated with film properties measured by Raman spectroscopy and scanning electron microscopy, the results from FTIRRAS indicate that the absorption of the graphitic and diamond phases are related to the ratio of CH4 to H2 and can be identified at the early stages of film growth.

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Optical properties of plasma species absorbed during diamond deposition on steel

Shahedipour

Conner

White

2000

Journal of Applied Physics

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Efficiency calibration for a NaI scintillation detector based on Monte-Carlo process and preliminary measurements of bremsstrahlung

Huang¹,

Naiyan²

2014

Acta Phys. Sin.

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In order to better apply the NaI scintillation spectrometer to bremsstrahlung measurements, the energy response function of a NaI detector spectrometer system is studied by using 137Cs and 60Co sources based on Monte Carlo N particle transport code (MCNP) process. Simulated and measured almighty peak efficiency are in good agreement. An energy response matrix (ERM) is obtained by simulating photons with a certain energy incident on the NaI crystal in MCNP process, through deconvoluting the detected spectrum of NaI using the ERM, and the results of the deconvolution accord well with those from the original spectrum. Furthermore, the NaI detector is used to preliminarily detect its response to bremsstrahlung generated by high intensity electrons bombarding a target of 1.5 mm thickness.

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Modified Method for Efficiency Calibration of High Energy γ Detector

Cited by 2 publications

References 3 publications

Optical properties of plasma species absorbed during diamond deposition on steel

Optical properties of plasma species absorbed during diamond deposition on steel

Efficiency calibration for a NaI scintillation detector based on Monte-Carlo process and preliminary measurements of bremsstrahlung

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