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{{Original research|date=September 2007}}
 
'''Decay correct''' is a method of adjusting the measurements of [[radioactive decay]] obtained at two different time points so that they may be used as a single data set. If a chemical compound is tagged with a radioactive [[isotope]] then the amount of radiation released in a period of time is proportional to the number of atoms of the isotope; but as time passes some of the isotope decays and the isotope remaining (which is measured by the radiation) is no longer the same as the amount of compound present. Decay correction is a mathematical method of determining the amount of compound present given the amount of isotope remaining.
 
==Use==
For example, in [[biodistribution]] studies, it is common to track the movement of a compound of interest through an animal. 
To measure the compound it is chemically joined to a [[radionuclide]]. Thus the energy measured from the radioactive decay is related to the quantity of the compound of interest.
 
Samples may be collected and counted at short time intervals (ex: 1 and 4 hours). The next samples (from another set of animals injected at the same starting time) may not be collected and counted until 24, 48, or 72 hours. Because isotopes for therapy and imaging often have a relatively short [[half-life]] (under 10 days), it is necessary to adjust the data in order to compare all the time points.
 
For example, the [[isotope]] copper-64, commonly used in medical research, has a half-life of 12.7 hours.  If you inject a large group of animals at "time zero", but measure the radioactivity in their organs at two later times, the later groups must be "decay corrected" to adjust for the decay that has occurred between the two time points.
 
==Mathematics==
 
The formula for decay correcting is:<math> A_0 = \left ( {A_t}*{e^{kt}} \right ) </math>
 
where  <math> A_t </math> is the raw, (uncorrected) count at time t, <math>A_0</math> is the count at time 0 (the decay corrected counts), "e" is the "inverse [[natural log]]" function, "k" is the [[decay constant]] (or "lambda"), and "t" is the elapsed time. 
 
The decay constant is <math>\left ( \frac{0.693}{t_{1/2}} \right )</math> where .693 is (approximately) the <math>\ln 2</math> and "<math>t_{1/2}</math>" is the [[half-life]] of the radioactive material of interest.
 
==Example==
 
The decay correct might be used this way: a group of 20 animals is injected with a compound of interest on a Monday at 10:00 a.m.  The compound is chemically joined to the isotope copper-64, which has a known half-life of 12.7 hours, or 764 minutes.  After one hour, the 5 animals in the "one hour" group are killed, dissected, and organs of interest are placed in sealed containers to await measurement. This is repeated for another 5 animals, at 2 hours, and again at 4 hours.  At this point, (say, 4:00 p.m., Monday) all the organs collected so far are measured for radioactivity (a proxy of the distribution of the compound of interest). The next day (Tuesday), the "24 hour" group would be killed and dissected at 10:00 a.m., then measured for radioactivity, (say at 11:00 a.m.). In order to compare ALL the groups together, the data from the "24 hour" must be decay corrected: the radioactivity measured on the second day must be "adjusted" in order to allow a comparison to measurements from an earlier time, but of the same original material.
 
In this case, "time zero" is Monday, 4:00 p.m., when the first three groups (1,2, and 4 hour animals organs) were measured. The "24 hour" group was measured at 11:00 a.m. Tuesday, which is 19 hours after the first groups.
 
Start by calculating the decay constant "K". Substitute 12.7 (hours, the half-life of copper-64) for <math> t_{1/2} </math>, giving
<math> {0.693 \over 12.7} </math> = 0.0546.
 
Next, multiply this value of "K" by the time elapsed between the first and second measures of radioactivity, 19 hours:  (0.0546 x 19) = 1.0368.
 
Change the sign, to make it '''-'''1.0368, then find the "inverse Ln"; in this case 0.3546.
 
This value is in the denominator of the decay correcting fraction, so it is the same as multiplying the numerator by its inverse (<math> {1 \over 0.3546} </math>), which is 2.82.
 
(A simple way to check if you are using the decay correct formula right is to put in the value of the half-life in place of "t". After you perform the inverse Ln, the value should be very close to 0.5.  When divided into the value "A" (for uncorrected counts), it effectively doubles them, which is the necessary correction after one half-life has occurred.)
 
In this case, the uncorrected values will be multiplied by 2.82, which corrects for 19 hours elapsing (between one and two half-lives).
 
If the radiation measured has dropped by half between the 4 hour sample and the 24 hour sample we might think that the concentration of compound in that organ has dropped by half; but applying the decay correct we see that the concentration is  0.5*2.82 so it has actually increased by 40% in that period.
{{Unreferenced|date=March 2007}}
 
[[Category:Radioactivity]]

Revision as of 21:00, 28 February 2014

Most expats moving to Singapore are transient, relocated by a big firm for just a few years and then sent on their approach once more. It follows that the majority of expats are extra thinking about renting property in Singapore, slightly than buying.

A person who works for an actual estate agency is required to register himself/herself with the CEA, by means of the real property company that (s)he works for. Not have previously been a sole-proprietor, KEO, director or companion of an estate agency whose license was revoked. Neither ought to the estate agency nor any of its key members or employees hold a money-lender's license or be part of a licensed cash-lender. The estate company must fulfil the match and correct criteria i.e. not be bankrupt, nor convicted of fraud, dishonesty, or breach of fiduciary duties. Should have handed an industry examination i.e Actual Property Salesperson (RES) examination or equal; Rental Interval of 4 years (48 months) or LESS Total rental x 0.004 The due date of every rental cost; or

Below the new regulatory regime administered by the Council for Property Agencies (CEA), one of many registration standards condo For sale in Singapore property agents (or individual salespersons) is that they have to go the CEA's Actual Property Salesperson (RES) examination or have equivalent qualification. That is to make sure that brokers desiring to do property agency work are effectively qualified, professionally competent and be capable to work effectively in the true estate business. Equally necessary is that they must uphold good moral requirements

Whereas the rules aren't legally binding, the Act may nonetheless be invoked to prosecute errant telcos or real property agents who flout the principles spelt out underneath the Act. All TAXI DRIVER, PROPERTY AGENT, FINANCIAL ADVISER, FOOD STALL PROPRIETOR AND DIRECT PROMOTING MARKETER & ALL ENTERPRISE PROPRIETOR , STARTUP AND MANY OTHERS Within the remaining a part of this collection, I interview one of many high brokers in ERA Horizon Group and share with you the secrets and techniques to his success! Learn it RIGHT HERE The STOMPer thinks the agents are resorting to determined measures by specializing in the elderly. Actual estate company for occupiers and traders, gives leasing, brokerage, valuation, funding and asset administration, property, project, township and facilities administration. Building and actual property consulting.

Many brokers additionally fail to share. Many new agents do not like to share their problems, errors or ideas with others. They hold every part to themselves, thinking that different individuals may not be keen to assist or might steal their ideas, so that they end up repeating many of the standard mistakes made by others. I believe that the more you give, the more you get. We can't do that enterprise alone. We now have to be extra open-minded and humble sufficient to be taught from others – whether or not they are new or experienced brokers.

Contemporary serviced residences positioned just off Orchard Road. one hundred sixty Orchard Road, #06-01 Orchard Point, Singapore 238842. On the market, purchasing and leasing in the main and secondary private residential markets. 30 Cecil Road, #20-03 Prudential Tower, Singapore 049712. 2nd timers would in all probability rush for current EC launches prior earlier than at present so they would be capable of avoid the levy. Once more, these pool of purchasers would weed out in the market gradually. Your Property Could Be Featured Right here! on a aspect observe, should you intend to take this to an MP, watch out for how you method the criticism. this is afterall singapore and certain comments (or methods it is offered) will not be inspired. you may end up all of a sudden without any allies. Property Information Highlights

She could also be Singapore's High Actual Property Agent however there's nothing haughty about Ivy Lee." Balestier / Geylang (D12-14) fr.$350. Bedspace RENTAL. 5-8mins Hougang/Kovan/Potong Pasir MRT Serangoon / Thomson (D19-20) fr.$350. Bedspace RENTAL. 5-8mins Hougang/Kovan/Potong Pasir MRT Serangoon / Thomson (D19-20) spacious grasp room lease in woodlands, aircon & Wifi. 15.four.9 Obvious authority can come up even with companies. A company can make the requisite representations through its properly authorized officers or by way of one in every of its organs such as the board of directors, see Freeman & Lockyer v Buckhurst Park Properties Ltd 1964 2 QB 480. SECTION 6 RELATIONSHIP BETWEEN THE PRINCIPAL AND AGENT

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