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wonderingchicken
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- TL;DR Summary
- Is peak dose and peak dose rate the same thing or different?
What is the difference between peak dose 100 kRads (Si) and peak dose rate 10 x 10^12 Rads (Si)/s? Can someone explain?
Vanadium 50 said:One is total and the other is per unit time. Like work and time. Or pay per hour and the size of your paycheck.
Motore said:A reference of where you saw these numbers would help.
Motore said:Ok. And what is the problem? The peak dose rates referenced in the article are for a FWHM 20ns pulse. Because of the short pulse, the dose (which is the integrated dose -> area under the peak dose curve) is substantially less.
Vanadium 50 said:First, your obsession with Hermes-III is really not helpful. You seem to have decided that it is uniquely dangerous first and then started looking for facts to support this pre-conclusion.
Second, the difference between peak and total is not unique to Hermes, nor accelerators, nor even physics.
Suppose you get paid $100 a day. Now suppose you were paid $100 for an hour, but had to take the rest of the day off. Now suppose you were paid $100 for an second, but had to take the rest of the day off. Now suppose you were paid $100 for an microsecond, but had to take the rest of the day off. In which case do you make the most money?
In any of the circumstances does the pay rate of $3,1000,000,000,000/year make sense?
You divide 15 x 10^12 rads per second by 1000000000 nanoseconds per second and get 15000 rads per nanosecond. Yes, that would be a correct calculation.wonderingchicken said:I don't know if my calculation is correct. But one second is equal to 1000000000 nanosecond. Let's assume the peak dose rate is 15 x 10^12 Rads per second. 15 x 10^12/s is 15000000000000 per one second. I divide 15000000000000 by 1000000000 nanosecond and I get 15000.
15000 rads per nanosecond with an exposure of 20 nanoseconds gives 300000 rads.If we reduced it by 20 nanosecond, then I get 30000 Rads. So, in 20 nanosecond the total dose is 30000 Rads. Is that correct?
jbriggs444 said:You divide 15 x 10^12 rads per second by 1000000000 nanoseconds per second and get 15000 rads per nanosecond. Yes, that would be a correct calculation.
15000 rads per nanosecond with an exposure of 20 nanoseconds gives 300000 rads.
You lost me on the "reduced it by 20 nanosecond" bit. What are we reducing? And why are we left with 20 nanoseconds?
So we need to reconcile a calculation that multiplies the peak dose rate by the pulse width and gets a figure that is three times as high as the peak dose.wonderingchicken said:Because the pulsewidth is just 20 nanosecond. The peak dose (not peak dose rate) is around >100 kRads according to the specs of the accelerator, which is lower than 300000. So, I think 300000 will be the absolute max.
jbriggs444 said:So we need to reconcile a calculation that multiplies the peak dose rate by the pulse width and gets a figure that is three times as high as the peak dose.
Do you know about integrals?
Yes. That is the 'gist of what I was going to be saying.wonderingchicken said:I have to tell you, my mathematics skills are bad.
I asked one of my friend and he responded, the difference between peak dose and peak dose rate indicates the pulsewidth is not square. If the pulse is square, dose rate will be total dose divided by the length of the pulse in seconds.
jbriggs444 said:Yes. That is the 'gist of what I was going to be saying.
If you graph out the dosage rate over time and look at the area under the curve, you'll get the total dose. For a square wave form, the area is pulse width times pulse height just as one would expect. But for a non-square wave, the area will be something less than the peak height times the total width.
In mathematics, an "integral" is the area under a curve.
Peak dose refers to the maximum amount of a substance or radiation that is delivered at a given time. Peak dose rate, on the other hand, refers to the rate at which the substance or radiation is delivered over a given period of time.
Peak dose is typically measured in units of mass per unit of body weight, such as milligrams per kilogram. Peak dose rate is measured in units of mass per unit of time, such as milligrams per hour.
Distinguishing between peak dose and peak dose rate is important because they represent different aspects of exposure to a substance or radiation. Peak dose gives an idea of the maximum amount of exposure, while peak dose rate gives an idea of how quickly that exposure is occurring.
Peak dose and peak dose rate can have different effects on the body depending on the substance or radiation being delivered. In general, a high peak dose can cause immediate damage to cells and tissues, while a high peak dose rate can lead to long-term effects such as cancer.
The factors that can influence peak dose and peak dose rate include the type and amount of substance or radiation being delivered, the duration of exposure, and the distance from the source of exposure. Other factors such as individual sensitivity and protective measures can also play a role.