Measurement of the167Er content in absorbing reactor materials based on the detection of the prompt gamma radiation

1988 ◽  
Vol 65 (4) ◽  
pp. 853-854
Author(s):  
V. P. Koroleva ◽  
K. I. Zolotarev ◽  
L. A. Chernov
Keyword(s):  
Gamma Radiation ◽  
Prompt Gamma ◽  
Reactor Materials ◽  
Prompt Gamma Radiation

Detection of Prompt Gamma Radiation Near the LVR-15 Research Reactor

2019 ◽  
Vol 186 (2-3) ◽  
pp. 244-248
Author(s):  
Ladislav Viererbl ◽  
Vít Klupák ◽  
Antonín Kolros ◽  
Hana Assmann Vratislavská ◽  
Zdena Lahodová
Keyword(s):  
Gamma Radiation ◽  
Energy Range ◽  
Research Reactor ◽  
Reactor Core ◽  
Pulse Height ◽  
Wide Energy Range ◽  
Prompt Gamma ◽  
Reactor Building ◽  
Wide Energy ◽  
Prompt Gamma Radiation

Abstract The paper describes a method of pulse height spectrum measurement in a wide energy range. The LVR‑15 research reactor building was chosen to demonstrate this method. Pulse height spectra were measured on the third floor of the reactor building. Two types of scintillation detectors, NaI (Tl) and a plastic scintillator, were used. The detectors were placed for about 25 m from the reactor core, thus, separated from the primary circuit water in the reactor pool, biological shielding, building wall and other constructional materials. Spectra were measured in a wide energy range from 30 keV to 1000 MeV, in which signals were recorded from natural and man-made radionuclides, prompt gamma radiation and cosmic radiation. Experimental data were collected both while the reactor was in operation and while it was out of operation. This study confirms that differences in these spectra can be detected remotely over relatively large distances from the reactor core by adequately simple detection means.

Prompt gamma radiation as a new tool to measure reactor power

2013 ◽  
Vol 91 ◽  
pp. 19-27 ◽  
Author(s):  
Majid jalali ◽  
Mohammad Reza Abdi ◽  
Mojtaba Mostajabod davati
Keyword(s):  
Gamma Radiation ◽  
Reactor Power ◽  
Prompt Gamma ◽  
Prompt Gamma Radiation

Effects of sterilization modes on the mechanical strengths of plaster of paris implants

1989 ◽  
Vol 47 ◽  
pp. 890-891
Author(s):  
K. Cowden ◽  
B. Giammara ◽  
T. Devine ◽  
J. Hanker
Keyword(s):  
Gamma Radiation ◽  
Calcium Sulfate ◽  
Significant Loss ◽  
Potassium Sulfate ◽  
Limiting Factors ◽  
Radiation Sterilization ◽  
Plaster Of Paris ◽  
Hardness Tester ◽  
Dry Heat ◽  
Calcium Sulfate Hemihydrate

Plaster of Paris (calcium sulfate hemihydrate, CaSO4. ½ H2O) has been used as a biomedical implant material since 1892. One of the primary limiting factors of these implants is their mechanical properties. These materials have low compressive and tensile strengths when compared to normal bone. These are important limiting factors where large biomechanical forces exist. Previous work has suggested that sterilization techniques could affect the implant’s strength. A study of plaster of Paris implant mechanical and physical properties to find optimum sterilization techniques therefore, could lead to a significant increase in their application and promise for future use as hard tissue prosthetic materials.USG Medical Grade Calcium Sulfate Hemihydrate Types A, A-1 and B, were sterilized by dry heat and by gamma radiation. Types A and B were additionally sterilized with and without the setting agent potassium sulfate (K2SO4). The plaster mixtures were then moistened with a minimum amount of water and formed into disks (.339 in. diameter x .053 in. deep) in polyethylene molds with a microspatula. After drying, the disks were fractured with a Stokes Hardness Tester. The compressive strengths of the disks were obtained directly from the hardness tester. Values for the maximum tensile strengths σo were then calculated: where (P = applied compression, D = disk diameter, and t = disk thickness). Plaster disks (types A and B) that contained no setting agent showed a significant loss in strength with either dry heat or gamma radiation sterilization. Those that contained potassium sulfate (K2SO4) did not show a significant loss in strength with either sterilization technique. In all comparisons (with and without K2SO4 and with either dry heat or gamma radiation sterilization) the type B plaster had higher compressive and tensile strengths than that of the type A plaster. The type A-1 plaster however, which is specially modified for accelerated setting, was comparable to that of type B with K2SO4 in both compressive and tensile strength (Table 1).

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