A high pressure tiny pump operatable in a range of (0.5-5) ×105 Pa was needed for gas circulation in the newly developed direct measurement method of radioactivities of gaseous samples, yet, such a pump was not commercially available. A tiny air bubbling pump of electromagnetic vibrating-reed type for small fish raising was remodeled by putting it inside a high pressure stainless steel vessel and vibrating the reed with an electromagnet being set outside the vessel wall. Gas flow rate (Pa·m3/s) was measured at atmospheric pressure both by a method using a measuring-cylinder and by radioisotope (RI) tracer method, and at other pressures by RI tracer method. The flow rate decreased with increasing pressure and viscosity of the gas. The pump was very useful for the present purpose. Details of remodeling and characteristics of the pump are described.
We measured radioactive nuclides in cover gas of the primary containment vessel by using an ionization chamber, germanium detector and liquid scintillation counter. We verified radionuclides, 37Ar, 3H, 14C, 13N, and222Rn. We have not been noticed the existence of37Ar until this study, but the major nuclide in the gas is37Ar, and40Ca (n, a) 37Ar is considered as it's formation reaction.
The comparative study of the blood clearance tests of99mTc-phytate (99mTc-P) and indocyanine green (ICG) was undertaken in liver-injured rats with D-galactosamine (GaIN) . The blood clearances of99mTc-P and ICG in rats decreased with the increase in dose of GalN and with the time elapsed after GalN administration. As compared with the blood clearance test of ICG, the blood clearance test of99mTc-P in rats was found to be more sensitive in detection of the hepatic dysfunction with mildly damaged stage, but to be relatively inaccurate in detection of the hepatic dysfunction with severely damaged stage induced by GalN.