So how is a becquerel different from a hertz? 203.82.183.147 14:56, 27 Feb 2005 (UTC)
The article says:
How so? How would using a unit like, for example, "Emissions per second" (or "eps") result in confusion? A higher number would still indicate greater radioactivity. —The preceding unsigned comment was added by 69.181.75.84 ( talk • contribs) 14:23, 19 May 2006.
The article does not give any feeling how much is one becquerel? One giga-becquerel? and such.
An example can be one kg of granite (which is a bit more radioactive rock than average), approximately how many becquerels is in it? —Preceding unsigned comment added by 90.176.40.79 ( talk) 16:44, 3 January 2010 (UTC)
The Wiki entry on banana equivalent dose states this: "A banana equivalent dose (abbreviated BED) is a unit of radiation exposure, defined as the additional dose a person will absorb from eating one banana". According to this it is an absorbed equivalent dose measured in Sv, (78 nSv) so is not relevant to a discussion of activity. The activity of one banana is supposed to be 15Bq, but this is not the BED. AJS 77.96.59.93 ( talk)
Say you have a certain quantity of substance A, half-life 10 years, which decays into substance B, half-life 10 seconds. The total activity is about double the activity of A, since each disintegration of an atom of A is almost immediately followed by a disintegration of the newly formed atom of B.
Is there any standard way to express such a situation, which I think is quite common? If you just say "I have 1000 Bq of A", counting only the disintegrations of atoms of A, that is misleading, since you actually have about 2000 disintegrations per second.
-- David Olivier ( talk) 09:17, 29 March 2011 (UTC)
I was looking for a source for this statement, but all I can find are internet postings that seem to be a copy-paste of this wikipedia article.
However, doing some simple math the average human body contains 160 grams of potassium-40 at 31 becquerels / gram gives an average of 4960 becquerels. However, it would be nice to find a formal source. The banana equivalent dose article could use a similar source.-- RaptorHunter ( talk) 21:47, 24 May 2011 (UTC)
The Wiki article on Potassiunm gives a reference quoting 120g of potassium in a 60kg adult. In these days of galloping obsesity this might seem to be unrepresentative in some countries, but multiplying by 31Bq gives 3.72kBq for a rather light-weight adult. AJS 77.96.59.93 ( talk) —Preceding undated comment added 14:58, 5 February 2014 (UTC)
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The article states:
"For instance, one gram-mole of potassium contains 0.0118 gram of 40K (all other isotopes are stable) that has a t1/2 of 1.248×109years=39.38×1015 seconds, and has an atomic mass of 39.963 g/mol, so the radioactivity is 3.2 kBq."
The calculation using these figures is correct, but I think that the quantity of potassium-40 is incorrect. Other Wikipedia pages, e.g. "Banana equivalent dose" and "Potassium" give 0.0117% K-40. Using that figure I get 0.00457 gram K-40 per gram-mole potassium, giving 1.14 kBq.
As this is not my area of expertise I would like someone else to check this and make any necessary corrections.
81.135.32.137 ( talk) 19:54, 6 January 2013 (UTC)Michael Barnes
In the section "Radiation Related Quantities" the table's row for the quantity Fluence (Φ) seems inappropriate, due to imprecision and inaccuracy. Fluence in physics is a flow during time, but in medicine it's a flow through an area. Becquerels of radiation are more relevant to medicine, but in that field the measurement is "more properly referred to as radiant exposure". Radiant exposure in photometry is visible light, which becquerels of radiation usually are not; the radiometric metric is more appropriate. So the precise "fluence" of radiation that's measured in becquerels is "radiant exposure", not the ambiguous "fluence". Radiant exposure is symbolized by He, indicating joules per square meter (J/m2). The table instead gives reciprocal area (cm-2 or m-2), which is radiometry's concern, but missing the energy component.
So I propose changing that row to instead document Quantity: radiometric exposure; Name: radiant exposure; Symbol: He; Unit: joule per square meter. That rendering is consistent with the radiant exposure article's table of SI radiometry units. However, since it's a derived quantity and unit rather than one with a proper name, I haven't found a year in which it was introduced, so I'd leave that blank.
Any reason not to make this change? — Preceding unsigned comment added by DocRuby ( talk • contribs) 15:37, 18 February 2014 (UTC)
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@ Ita140188: In what sense is it useful to repeat the phrase "For practical applications, Bq is a small unit."? Dondervogel 2 ( talk) 14:22, 19 February 2020 (UTC)
Method of sustained energy release from naturally occuring radioactive materials by electromagnetic means
Essentially back in 2011 I theorised that it was possible to generate conditions that would cause a long lived radioactive isotope to decay along a predetermined channel in a shorter time than observation in nature would suggest, but not inconsistent with thermodynamics. More recently I tested this theory using off the shelf components and it appears that my reasoning was correct. The energy release was not considerable but on par with Becquerel's early experiments. I had to concentrate the material but this turned out to be simple. It appears that in order for this to work technology would need to be invented from scratch, but its not as hard as it looks.
I am now testing it with a larger setup, using a tube amateurs have also utilized for its unusual effects along with a piece of technology invented by Nakamura and other external components. Intriguingly none of the parts are restricted in any way at present. The secret is to use a reflex method that "tunes" the band looking for a spike so energy production is exponentially increased. — Preceding unsigned comment added by 88.81.156.165 ( talk) 07:39, 9 September 2020 (UTC)