Disintegrations per minute

B.t.u. per square foot per minute Kilowatts per square foot 0.1758 Curies Disintegrations per minute 2.2 X 10 ... 

Figure 5 Atmospheric concentrations for CFC-11, CFC-12, CFC-113, SFg (pptv) and Kr (dpm cm ). CFC data courtesy of E. Busenberg and L. N. Plummer (US Geological Survey) atmospheric Kr activities complied by W. M. Smethie (LDEO) (dpm = disintegrations per minute)...

A liquid scintillation counter. This instrument is used to detect radiation and measure disintegrations per minute quickly and accurately. 

Alternatively, activity may be cited in disintegrations per minute or, perhaps most commonly, in curies (Ci)... 

The activity of a sample of a radioisotope was found to be 2150 disintegrations per minute. After 6.0 hours the activity was found to be 1324 disintegrations per minute. What is the half-life of the radioisotope ... 

The value given in Table II for adrenals 21 days following administration suggests that this tissue may concentrate TCDD- C and/or a metabolite. This observation results probably from experimental error. The disintegrations per minute (dpm) above background for this tissue were only 17, 29, and 90. Since the total amount of tissue available for analysis was less than 20 mg, the multiplication factor may have magnified the error many fold. 

Plummer (US Geological Survey) atmospheric 85Kr activities complied by W. M. Smethie (LDEO) (dpm = disintegrations per minute)... 

The current decay rate of the 14C in a sample is 4.82 disintegrations per minute per gram (d/min-g). The14 C activity of living organisms is 15.3 d/min-g. The half-life of14C is 5730 years. How many years old is the sample ... 

NOTE Activities are reported as disintegrations per minute/gram carbon (dpm/gC). The natural-level abundances are based on the activity of oxalic acid (NIST SRM 4990) and use the 5730 year half-life of 14c (Karlen et al., 1964). The productivity work abundance is based on published JGOFS protocols for measuring primary productivity (Karl et al., 1996). ... 

Bq (Bequerel) = 1 dps (disintegrations per second) = 0.0167dpm (disintegrations per minute)... 

Activity (1) The effective concentrahon of a solute. Solute activity is significantly lower than total concentration in solutions of high ionic strength. (2) Rate of radioachve decay, usually measured in disintegrations per minute (dpm). 

Disintegrations per minute (dpm) The unit measurement of radioactive decay rates. 

Table III. Recovered Activity (Average Disintegrations per Minute + Standard Deviation) for the...

An analytical chemical technique that utilizes radioactive (or stable) isotopes for the quantitative analysis of the amount of substance. In the absence of a kinetic isotope effect, isotopic isomers react identically with respect to their unlabeled counterparts. The method offers the advantage that specific activity (or gram-atom excess in the case of stable isotopes) is an intensive variable. Therefore, one only needs to recover sufficient labeled metabolite to determine amount of substance and disintegrations per minute (or, gram-atom excess) to reach an accurate determination of specific activity. The technique is feasible so long as one can accurately determine the initial and final specific activities. 

One unit for A is dpm (number of disintegrations per minute). Another unit is the curie (Ci), which is defined as 3.7 x 10 ° disintegrations per second. 

Although radioactivity is defined in terms of nuclear disintegrations per unit of time, rarely does one measure this absolute number in the laboratory. Instruments that detect and count emitted particles respond to only a small fraction of the particles. Data from a radiation counter are in counts per minute (cpm), which can be converted to actual disintegrations per minute if... 

B 1. Calculate the half-life of an isotope from the following experimental measurements. At time = 0, the activity is 300 disintegrations per minute. After 1 hour, the activity is 200 disintegrations per minute. 

B 4. How long will it take a sample of 32P that contains 65,000 disintegrations per minute to decay to 1500 disintegrations per minute ... 

If a 1-g sample of carbon contains 15.0 disintegrations per minute, what will be... 

If a radioactive sample of 59Fe t /i = 44.496 d) has an activity of 1000 disintegrations per minute, what weight of 59Fe is present ... 

The natural unit of radioactivity is disintegrations/time, such as disintegration per second (dps) or disintegrations per minute (dpm), and so on. The SI (International System) unit of radioactivity is the Becquerel (Bq) where... 

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