Optical absorption of Ar and H ion beam irradiated multi-walled carbon nanotube (MWCNT) sheets at various doses in the visible and terahertz spectral ranges was investigated.It was found that the optical absorption of...Optical absorption of Ar and H ion beam irradiated multi-walled carbon nanotube (MWCNT) sheets at various doses in the visible and terahertz spectral ranges was investigated.It was found that the optical absorption of MWCNT sheets in the visible range was decreased with increasing ion irradiation dose.Similar behavior was observed in terahertz range,where the optical absorption of MWCNT sheets in the range of 0 to 1.5 THz was also decreased with increasing ion irradiation dose.The optical absorption decreases in irradiated MWCNT sheets can be ascribed to the increase of defects in the irradiated MWCNTs.展开更多
18F-FDG PET/CT was used for evaluation of spleen infiltration in patients with B-cell non-Hodgkin lymphoma(NHL).Five patients with histological diagnosed B-cell NHL underwent1 8F-FDG PET/CT examination.On integrated P...18F-FDG PET/CT was used for evaluation of spleen infiltration in patients with B-cell non-Hodgkin lymphoma(NHL).Five patients with histological diagnosed B-cell NHL underwent1 8F-FDG PET/CT examination.On integrated PET/CT image,spleen infiltration was considered when PET images revealed a discrete margin of solid splenic masses or diffuse lesion of spleen with higher maximum standardized uptake value(SUV) greater than those of normal liver structures.CT images demonstrating a positive splenic index(>480 mL)or focal hypodensities were classified as positive for spleen infiltration.All the patients underwent systemic chemotherapy.The1 8F-FDG PET and CT results were compared with final diagnoses.All patients had spleen infiltration originating from B-cell NHL at final diagnosis.Final diagnoses,which were confirmed by clinical and CT(n=3) or1 8F-FDG PET/CT(n=1) follow-up in 4 patients and biopsy of 1 patient.On integrated PET/CT image,1 8F-FDG PET was true-positive in all 5 patients with spleen infiltration.CT was true-positive in 4 of the 5 patients with spleen infiltration and false-negative in 1 patients (spleen infiltration without morphology changes).The accuracies of1 8F-FDG PET and CT for evaluating the spleen infiltration were 100% and 80% at staging,respectively.Our preliminary results suggested metabolic imaging of1 8F-FDG PET/CT may be helpful in the diagnosis of spleen infiltration in B-cell NHL patients.These patients may benefit from1 8F-FDG PET/CT in diagnosis,when spleen infiltration without morphology changes,which may not be diagnosed exactly by conventional image.展开更多
Cobalt nanoparticles were synthesized by electron beam irradiation without any catalysts at room temperature and ambient pressure.The nanoparticles were characterized by X-ray diffraction,transmission electron microsc...Cobalt nanoparticles were synthesized by electron beam irradiation without any catalysts at room temperature and ambient pressure.The nanoparticles were characterized by X-ray diffraction,transmission electron microscopy,vibrating sample magnetometer,and laser scattering particle size distribution analysis.Average size of the nanoparticles was about 32 nm with a narrow size distribution.Melting point of the nanoparticles was about 451.3℃.展开更多
In this paper we present a timing detector which has low detection threshold and is radiation-resistant.The photons induced by radioactive beam ions passing through a thin plastic-scintillator foil BC422,emit from the...In this paper we present a timing detector which has low detection threshold and is radiation-resistant.The photons induced by radioactive beam ions passing through a thin plastic-scintillator foil BC422,emit from the foil center corresponding to one focal point of an aluminum ellipsoidal mirror and are reflected to another focus point at which the cathode of a photomultiplier tube locates.A time resolution of about 115 ps can be achieved for1 2N of 58.5 MeV/u and 130 ps for1 7B of 43.7 MeV/u.The counting rate up to 10 8packets per second(pps) is allowed.展开更多
For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments i...For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments in normal radon laboratory were performed.The track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 h.The experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to αparticles.Therefore,the calibration factor K should be corrected from the calculated result.展开更多
基金Supported by Chinese Academy of Sciences Knowledge Innovation Program(No.KJCX3.SYW.N10)National Natural Science Foundation of China(No.10775171)
文摘Optical absorption of Ar and H ion beam irradiated multi-walled carbon nanotube (MWCNT) sheets at various doses in the visible and terahertz spectral ranges was investigated.It was found that the optical absorption of MWCNT sheets in the visible range was decreased with increasing ion irradiation dose.Similar behavior was observed in terahertz range,where the optical absorption of MWCNT sheets in the range of 0 to 1.5 THz was also decreased with increasing ion irradiation dose.The optical absorption decreases in irradiated MWCNT sheets can be ascribed to the increase of defects in the irradiated MWCNTs.
基金Supported by Commission of Science and Technology of Xiamen City (Grant No.3502720077056)
文摘18F-FDG PET/CT was used for evaluation of spleen infiltration in patients with B-cell non-Hodgkin lymphoma(NHL).Five patients with histological diagnosed B-cell NHL underwent1 8F-FDG PET/CT examination.On integrated PET/CT image,spleen infiltration was considered when PET images revealed a discrete margin of solid splenic masses or diffuse lesion of spleen with higher maximum standardized uptake value(SUV) greater than those of normal liver structures.CT images demonstrating a positive splenic index(>480 mL)or focal hypodensities were classified as positive for spleen infiltration.All the patients underwent systemic chemotherapy.The1 8F-FDG PET and CT results were compared with final diagnoses.All patients had spleen infiltration originating from B-cell NHL at final diagnosis.Final diagnoses,which were confirmed by clinical and CT(n=3) or1 8F-FDG PET/CT(n=1) follow-up in 4 patients and biopsy of 1 patient.On integrated PET/CT image,1 8F-FDG PET was true-positive in all 5 patients with spleen infiltration.CT was true-positive in 4 of the 5 patients with spleen infiltration and false-negative in 1 patients (spleen infiltration without morphology changes).The accuracies of1 8F-FDG PET and CT for evaluating the spleen infiltration were 100% and 80% at staging,respectively.Our preliminary results suggested metabolic imaging of1 8F-FDG PET/CT may be helpful in the diagnosis of spleen infiltration in B-cell NHL patients.These patients may benefit from1 8F-FDG PET/CT in diagnosis,when spleen infiltration without morphology changes,which may not be diagnosed exactly by conventional image.
文摘Cobalt nanoparticles were synthesized by electron beam irradiation without any catalysts at room temperature and ambient pressure.The nanoparticles were characterized by X-ray diffraction,transmission electron microscopy,vibrating sample magnetometer,and laser scattering particle size distribution analysis.Average size of the nanoparticles was about 32 nm with a narrow size distribution.Melting point of the nanoparticles was about 451.3℃.
基金Supported by National Nature Science Foundation of China (No.10205019,10475098)Doctoral Foundation of Southwest University (No.SWNUB2005028)Hundred Talent Project of CAS (0501080BR0)
文摘In this paper we present a timing detector which has low detection threshold and is radiation-resistant.The photons induced by radioactive beam ions passing through a thin plastic-scintillator foil BC422,emit from the foil center corresponding to one focal point of an aluminum ellipsoidal mirror and are reflected to another focus point at which the cathode of a photomultiplier tube locates.A time resolution of about 115 ps can be achieved for1 2N of 58.5 MeV/u and 130 ps for1 7B of 43.7 MeV/u.The counting rate up to 10 8packets per second(pps) is allowed.
文摘For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments in normal radon laboratory were performed.The track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 h.The experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to αparticles.Therefore,the calibration factor K should be corrected from the calculated result.
