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chomsin sulistya widodo
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Environmental Science

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Effects of Quadrifide Sterculia R. Br Extract on Potential of Membrane of Oreochromis Niloticus Egg Cell Resulting from Pb Contamination Fetronela Rambu Bobu; Chomsin Sulistya Widodo; Johan Andoyo Effendi Noor
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (397.152 KB) | DOI: 10.21776/ub.natural-b.2016.003.04.4

Abstract

The effect of faloak (Sterculia quadrifida R.Br.) extract to the cell membrane potentials of tilapia (Oreochromis nilaticus) egg in contaminated water lead was studied. The cell membrane potential of tilapia egg was measured by a microelectrode connected to a Picoscope. The result showed that increasing of the Pb consentration caused decreasly of the membrane potential. Faloak extraction in contaminated water raised the membrane potential value. The concentration of faloak extract with the impact of raising the cell membrane potential of tilapia egg that have been contaminated by Pb is 0,8 mg. It seems that the antioxidant of faloak extract can reduce pollution rate.
Determination of Neutron Spectrum at LINAC Using a Passive Single Sphere Spectrometer Muhammad Helmi Hakim; Chomsin Sulistya Widodo; Bunawas Bunawas; Rasito Rasito
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (390.352 KB) | DOI: 10.21776/ub.natural-b.2016.003.04.7

Abstract

Neutron spectra at Linear Acceleration (LINAC) facility was needed to protect neutron radiation. The purpose of determination of neutron spectra at LINAC using Passive Single Sphere Spectrometer is getting spectra and neutron fluence from LINAC and knowing the influence of input voltage at LINAC to its spectra and neutron fluence output. Single Sphere Spectrometer (SSS) with diameters 30 cm using seven gold foil detectors was set in position a half of diameter (0, 3, 6, 9, 11, 12, 13 cm) from center of the SSS. Measurement of neutron count rate was performed by placing SSS under gantry of LINAC with SSD 100 cm in distances. Next, neutron count rate was used as input data in UMG 3.3 program to get spectra. Based on measurement, total of neutron fluence at LINAC 10 MV and 15 MV is 5,78 ´ 104 n/cm2.s ± 0,01 ´ 104and 9,44 ´ 105 n/cm2.s ± 0,22 ´ 105, so increasing input voltage at LINAC was followed by increased neutron fluence.
Co-Authors Bunawas Bunawas Fetronela Rambu Bobu Johan Andoyo Effendi Noor Muhammad Helmi Hakim Rasito Rasito