New determinations of the absolute emission intensity for the 241 keV γ ray (Iγ = 4.011(16) per 100 disintegrations of Ra) and of the Ra half-life (T1/2 = 3.6313(14) d) are presented and discussed in the context of previous measurements and evaluations....
224Ra (half-life, t1/2=3.64 days) has been used widely as a tracer. Its activity in natural waters can be measured by the 220Rn emanation method [Rama, Todd, J.F., Butts J.L., and Moore, W.S., 1987. A new method for the rapid measurements of 224Ra in natural waters. Mar....
(half-life 11.4 days) at the levels of about 1200 and 2400 rad mean skeletal dose reveals a considerably lower bone tumor risk for 223 Ra.Protracted application of the total dose 1000 rad over 9 months by injection of 0.28 碌Ci 227 Th/kg every two weeks resulted in an osteosarcoma ...
Since the half-life of 224Ra is only 3.7 d and since 228Th (as a measure for 228Ra) is built up only partially on the sample disc, a slightly higher detection limit of 0.24 mBq l−1 results for the latter isotopes. The procedure is therefore sufficiently sensitive...
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Test High Temperature Life Reference MIL-STD-202 Method 108 Storage Life Test Condition Limits 1,000 hours at 125°C with 2 X rated voltage applied excluding the following: Within Post Environmental Limits Cap: ±20% shift IR: 10% of Initial Limit Case Size Capacitance 0603 & 0805 ≥ 1.0 ...
224RaLate-effectOsteopeniaOsteonecrosisMiceSix groups of young adult, male mice were injected with six dose levels of the bone-seeking, α-emitting radionuclide 224 Ra (half-life 3.6 days); a seventh group was injected with saline alone. The administered doses were relatively low, ranging from ...
Radium-224 is a candidate alpha-emitter due to its convenient 3.6-day half-life, with more than 90% of the decay energy originating from alpha-particles. However, its inherent skeletal accumulation must be overcome to facilitate intraperitoneal delivery of the radiation dose. Therefore, Ra-224-...
Measurements of surface water and deep water Ra (half-life 3.64 days) distributions in Long Island Sound (LIS) were conducted in July 1991. Because the pycnocline structure of LIS had been in place for about 50 days in July (long compared to the half-life of Ra), Ra in the surface wat...
The short-lived radium isotopes, 223Ra (half-life = 11.4 d) and 224Ra (half-life = 3.66 d), were used to quantify this component of SGD in a large estuary, Long Island Sound (LIS), New York, United States. The tide is semidiurnal with a range of approximately 2 m. Concentrations ...