A new type hygrometer utilizing α-ray absorption was devised employing two ZnS (Ag) scintillation detectors coupled with optical fiber cables for measuring dry air density and humid air density. It was shown that the counting rate difference of the two detectors is directly proportional to the absolute humidity and the absolute humidity could be measured with an accuracy of ±2g/m3 without the effects of variations in air density due to temperature and atmospheric pressure.
The parameters of renogram (Tmax, T1/2, T2/3) and 2-3 min renal uptake rate with 99mTc-MDP in 10 patients with no renal dysfunction were compared with those with 99mTC-DTPA in 5 patients with normal renal function. The parameters and renal uptake rate in the 8 patients except 2 with cardiac and pulmonary disease were analogous to those of 99mTc-DTPA group, Especially renal uptake rate contains the information of kidney and circulation, and can be obtained in a short time. Therefore it may be clinically useful to measure the renal uptake rate of the patient in whom 99mTc-MDP bone scintigraphy are performed.