Radiation Units

Intended for clarifying the various measurement units for radioactivity
this page covers:

- the Curie (Ci)
- the Becquerel (Bq, used to report soil and food contamination, for instance)
- the rad   (rad)
- the Gray (Gy – also used in the media:  nGy/h = nanoGray per hour)
- the rem   (rem)
- the Sievert (Sv, also in the media: millieSievert (mSv& microSievert (µSv) per hour)
- the Roentgen (R)
- the Coulomb/kilogram (C/Kg)
- CPM (CPMCounts Per Minute, or CPS = Counts Per Second – are common
Differences between Alpha, Beta and Gamma ionizing radiation:  http://www.s-cool.co.uk/a-level/physics/radioactivity/revise-it/what-is-ionising-radiation
A basic Radiation Units converter: http://www.convert-me.com/en/convert/radiation/.  
!!–> For more complicated calculated “conversions”, see the excellent http://www.radprocalculator.com/ described further below (under Becquerel).  
UC Berkeley’s dose calculation page, http://www.nuc.berkeley.edu/UCBAirSampling/DoseCalculation, can be helpful too to clarify specific aspects of this complex field of study.
!!–> For decay calculations (in various units and for all isotopes), see this handy DECAY CALCULATOR: http://ordose.ornl.gov/decay.cfm

Note:  Easy Conversion table, at bottom of page.

! -> Another absolutely excellent helpful site for conversions is http://www.nuclearcrimes.org/conversions.php

Anoter helpful table (though here with the smallest at the top-beware)  for undoing confusion around prefixes (kilo, mega, giga, tera, peta, exa, etc.) I found:

RADIATION UNITS – extra explanation

  • Curie & Becquerel

The curie (Ci) was replaced by the becquerel (Bq). In this case Wikipedia is actually quite useful to explain what it “is” (though not how to work with it):  http://en.wikipedia.org/wiki/Becquerel

1 Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. That’s why there’s a quantity indicated:  becquerel…  per liter (Bq/L), per kilogram (Bq/Kg), per square meter(Bq/m2), per cubic meter (Bq/m3), etc.

Bq is always PER SECOND.   In contrast to ‘activity’, ‘dose rates’ and ‘absorbed dose rates’ (in Sievert (Sv), rem, or Gray (Gy)) can be for an event/instant (like a medical X-ray or CT-scan), for a period (annual dose from normal background radiation), or for a flow (usually per hour), such as for common sea level normal background radiation: 0.07 µSv/h

The becquerel is named for Henri Becquerel, who shared a Nobel Prize with Pierre and Marie Curie for their work in discovering radioactivity.

The curie (Ci), an older unit of radioactivity, is defined as radioactivity equal to the activity of 1 gram of radium-226. The conversion factors are:

1 Ci = 37,000,000,000 Bq,  meaning: that many decays occur in a gram of radium-226 per second

1 μCi = 37,000 Bq

1 Bq =  0.0000000000270 Ci

1 GBq = 0.0270 Ci

The US government offer reports food contamination in picoCurie (pCi) per volume or weight:


100 pCi = 3.7 Bq

For exampleVegetation from private garden in San Luis Obispo, sampled on April 14, 2011 measured “Cesium-137 @ 154.10 pCi/kg” (picoCurie per kilogram).  Using the below unit converter, 154.1 pCi = 5.7 Bq, so 5.7 Bq/kg of Cs-137 in that sample.  

! –> The http://www.radprocalculator.com/, which is super handy to calculate values for dose rates for certain isotopes for a number of Becquerels and vise vera.  It also includes a really convenient radiation units converter:  ! –> http://www.radprocalculator.com/Conversion.aspx.

–> Click image or here for description:  http://www.radprocalculator.com.

It’s useful for many conversions, but it’s particularly handy to do the complicated calculation for you to figure out the relation between ACTIVITY (Bq or Ci) and DOSE RATE (Sv, rem, etc.).   Go to the site to learn why you can’t simply convert Bq (activity)  measurements into dose rates (in µSv/h, etc.), where its FAQ section (on http://www.radprocalculator.com) clears up much:

Also, Regarding ‘Converting gamma or beta radiation ACTIVITY to EQUIVALENT DOSE rates’, see also this (more complicated) explanation:  http://hps.org/publicinformation/ate/faqs/gammaandexposure.html 

Play around with the calculator (adjust settings to your preferences: gamma, beta, disnatnce from isoptope, which isotope, which units, values,…):

- Using the http://www.radprocalculator.com, On March 25th, 2011, I wrote this blogpost, ‘Radioactive Food and Soil Reports – What do they mean?’ [See it HERE], which no one has pointed out errors on in two weeks, despite it having been viewed 55 times (as of 4/13)  in two months, despite it having been viewed hundreds of times.   There MUST be something wrong about it, or some nuance missing… something….  Though I have plenty of science background to interpret intermediate scientific papers, I actually have yet to finish college (I dropped out of Industrial Engineering studies after 1 year; and that was.. what?… 17 years ago?)  Anyhow. PLEASE leave a comment if you spot an error.

- Then, on March 27th , I posted  http://allegedlyapparent.wordpress.com/2011/03/27/fukuchima-fallout-in-us/ which listed some measurements by UC Berkeley, and then toyed around with the radprocalculator in a quest to gauge its actual danger, leaving me somewhat in limbo.

- On March 28, in the blogpost  http://allegedlyapparent.wordpress.com/2011/03/28/fallout-across-us-danger-lost-in-dose-translation/, I wrote: “Because of the calculated equivalent dose depends on the distance, I haven’t been able to really figure out how to arrive at a reasonable equivalent dose when presented with an activity reading in Becquerel per liter.  Until now: Found an answer on the ‘Berkeley Radiological Air and Water Dose Calculation‘ page [http://www.nuc.berkeley.edu/node/1897]“ … and then I toyed around with UCB’s formula…  Link updated to: http://www.nuc.berkeley.edu/UCBAirSampling/DoseCalculation

I think exploring these posts and toying around with the different formulas yourself could be hugely helpful in coming to an understanding of the becquerel as a unit and ways to interpret it.

An important thing to remember (IMO) is that “The language of dose is the language of deception”, as touched upon on my Radiation Exposure Effects page.

All in all, I must admit, I still actually don’t know how to gauge fallout measurements accurately and confidently.  Regardless of the formula used, there remains a psychological factor that leaves the ultimate assessment largely up to the weight given to the used formula (which by their nature contain some assumptions and generalizations), plus nuances that can’t easily be quantified, from personal sensitivities to dietary aspects, etc.

Toying around with these different formulas did at least teach me (truly – I’m not being facetious) that fallout levels (in the first 2 months following the Fukushima Nuclear Disaster of March 11, 2011), at least in as far as I can gauge based on the few rare places being monitored in the USA), and even for background radiation levelsover 200 km away from the Fukushima Daiichi NPP in Japan (places such as Tokyo), that the health risks are negligable for the short term (next years), appear minimal to near-negligable for the deacde ahead in those minimaly affected areas, but that closer to the high fallout areas, it’s bound to cause a variety of adverse health effects.  My sense is that probably over 95 % of those only minimally exposed will most likely be fine for the rest of their lives, as far as cancers, etc. are concerned.  As many experts have reiterated since, what changes the risk landscape is accumulations in food, which can magnify risks through accumulated higher concentrations of tissue-stored radionuclides.

I don’t know, but hope the above, as well as the rest of the radiation units information is helpful.

(Much of the above, I originally posted on my April 13, 2011 blogpost:     http://allegedlyapparent.wordpress.com/2011/04/13/becquerel-bq-terabecquerel/, to which I’ve added some nuances since.)

  • Rad  &  Gray

The rad (rad) or Radiation Absorbed Dose recognizes that different materials that receive the same exposure may not absorb the same amount of energy. A rad measures the amount of radiation energy transferred to some mass of material, typically humans. One Roentgen of gamma radiation exposure results in about one rad of absorbed dose. The rad thus represents a certain dose of energy absorbed by 1 gram of (human) tissue.  Expressed in SI Units, 100 rads = 1 Gray. Both are a unit of concentration. So if we could uniformly expose the entire body to radiation, the number of rads received would be the same (when expressed in rads or Grays) whether we were speaking of a single cell, an organ (e.g., an ovary) or the entire body (just as the concentration of salt in sea water is the same whether we consider a cupful or an entire ocean).  The International Commission on Radiation Units and Measurements wants aims for standardized use of units, for which they want us to give up the rad in favor of the gray (Gy).     1 Gy =100 rad

The Gray (Gy) approximates the “absorbed dose” of ionizing radiation (a.k.a. radioactivity).  The Gray replaced the rad; 1 Gray equals 100 rads.

1 Gy corresponds with 1 Sievert absorbed (for humans). Since some sites report in nGy/hr (nanoGray/hour; 1 Gy = 1,000,000,000 nGy), the easy key to convert Grays to Sieverts is: 1 Gy = 100 rad ; With Q=1 for gamma rays & human tissue (see rem), 100 rad x 1 = 100 rem ; and 100 rem = 1 Sv.

For easy conversion:   1 nGy/hr ≈ 0.001 µSv/hr.

For example, a reporting of  631 nGy/hr corresponds with
631 / 1000 =>            0.631 µSv/hr.
0.631 / 1000  =>        0.000631 mSv/hr ≈ 63 CPM (depending on the Geiger Counter)

  • Rem & Sievert

rem or ‘Roentgen Equivalent Man’ is a unit that relates the dose of any radiation (in rad or Gray) to the biological effect of that dose, in rem or Sievert).  To relate the absorbed dose of specific types of radiation to their biological effect, a “quality factor, Q” must be multiplied by the dose in rad, which then shows the dose in rems. For gamma rays and beta particles, 1 rad of exposure results in 1 rem of dose.  Interpretation of rems depends on what kind of radiation we’re speaking of. Some forms of radiation are more efficient than others transferring their energy to the cell.  To have a level playing field, it is convenient to multiply the dose in rads by a quality factor (Q) for each type of radiation to arrive at the “absorbed dose”. The resulting unit is the rem (“roentgen-equivalent man”). Thus, rem = rad x Q.  X-rays and gamma rays have a Q ≈ 1, so the absorbed dose in rads is the same number in rems.  (For contrast: Neutrons have a Q of about 5 and alpha particles have a Q of about 20. An absorbed dose of, say, 1 rad of these is equivalent to 5 rem and 20 rem respectively.)

[Source: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/R/Radiation.html, ]

If it wasn’t confusing enough yet, despite the years of high-quality research reported in rems and millirems (1 rem = 1000 mrem), the International Commission on Radiation Units and Measurements has replaced the rem by the Sievert (Sv):

100 rem = 1 Sv.

The Sievert (Sv) - is the same as the rem (albeit 100 rem = 1 Sv.): a unit measuring absorption of radiation by tissue (equivalent doses).  Like the rem, the Sievert takes into account the relative biologic effectiveness (RBE) of ionizing radiation, since each form of such radiation — e.g., X rays, gamma rays, neutrons — has a slightly different effect on living tissue.  Accordingly, one Sievert is generally defined as the amount of radiation roughly equivalent in biologic effectiveness to one gray (or 100 rads) of gamma radiation. I aim to to express all radiation doses in a single unit, the microsievert (µSv) to make comparisons easier (when possible).  Reporting is often done in millieSievert (mSv), which is 1,000 times bigger than a microSievert.

  • Roentgen  & Coulomb/kilogram

Roentgen (R) – The roentgen measures the energy produced by gamma radiation in a cubic centimeter of air. It is usually abbreviated with the capital letter “R”. A milliroentgen, or “mR”, is equal to one one-thousandth of a roentgen. An exposure of 50 roentgens would be written “50 R”.  See also  Wikipedia – HERE. For easy conversion:

1 microsievert (µSv) = 100 microroentgens (µR)

As an example in time-warped realities: even in 2011 you may still get reporting about radiation in Roentgen: “In Primorye, including Vladivostok, Russia’s largest city on the Pacific, exposure rates varied from 10 to 15 micro-roentgen per hour, while in Sakhalin they ranged from 5 to 15 micro-roentgen per hour. Exposure rates of up to 30 micro-roentgen per hour are considered normal.”, was reported in RiaNovosti, HERE (06:19 18/03/2011).  Conversion:

1 microsievert (µSv) = 100 microroentgens (µR)

1 µR/hr = 0.01 µSv/hr

10  µR = 0.1 µSv  = completely normal, on the low side of the natural range

Coulomb/kilogram (C/Kg) – not discussed here; See Wikipedia – HERE.

  • CPM = COUNTS PER MINUTE is a very clear measure of how many gamma rays hit a gamma ray sensor per minute.  The reading of course depends on the sensitivity of the Geiger Counter you’re using.   For many Geiger Counters  100 CPM = about 1 µSv/hr or vise versa: 1,000 µSv/hr would give readings of about 100,000 CPM (less on older or less sensitive models). For a technical look at the differences in Geiger Counter sensitivity, see here.

Reference: Normal USA CPM level:   10 to 50 CPM   (0.1 – 0.5 µSv/ hr),or up to 90 CPM in places like Denver, Colorado.

Baseline in Tokyo pre-accident: 10 to 20 CPM  Here’s an example of a CPM Geiger Counter streaming live data from Hino, Japan (near Tokyo):  http://park30.wakwak.com/~weather/geiger_index.html  See my RADIOACTIVITY page (tab) for many more options and global radiation monitoring stations online.


- The “Alert level” set for the US grassroots radiation network, for instance, of which the US Geiger Counter network seems an expanded and improved (also independent) version, is a mere 130 CPM or about 1.3 µSv/ hr, which, going solely by comparison to many radiation levels (see “Health Expose Effects”, would be little reason for alarm if it were originating from distant radiation sources only.  Most places wouldn’t reach such high readings naturally, thus it would be a clear signal that something has gone awefully wrong somewhere.  Another thing to keep in mind is that fallout tends to accumulate on the ground (especially with precipitation), and radiation monitors are usually high above the ground, sometimes even on top of buildings.

- Accumulative effects from built-up in cell tissue is not accounted for in simple comparisons between exposure to amounts of radiation, and thus they are a bit deceiving, downplaying the dangers.  See my Radiation Exposure Effects page for more about that.

- In many locations measurements are generally below 0.15µSv/hr, or on common Geiger Counters that would give readings somewhere between 5 and 30 CPM.

- Some more sensitive Geiger (gamma ray) Counters will give readings corresponding with ‘100 CPM = 5 µSv/ hr’, such as some on the monitor network in Belgium.

–>  For a technical look at the differences in Geiger Counter sensitivity, see HERE.

- Exposures can be expressed as totals, or as flows (units/time, such as mSv/hr).  Common prefixes are milliSievert (one-thousand of a SIevert, mSv) and microSievert (one-millionth of a Sievert), as well as hecto-gray (one-hundredth of a Gray, hGy).

- The various kinds of radiation units & how to convert them are als covered in this table at:  http://www.albert-cordova.com/iso/Units.htm (CAUTION, though: In this Table instead of the usual “µ” for micro, they used another “m” than for the m that abbreviates milli; along the same vein: u is sometimes used as an abbreviation for micro, instead of the more correct µ  (option m on a Mac)). Also at: http://orise.orau.gov/reacts/guide/measure.htm

- For reporting: Because for living organisms 1 Sv is such a large amount of radiation, generally measurements are given in milliSievert (mSv) or microSievert,  (µSv):

1 Sv = 1,000 mSv = 1,000,000 µSv

rems/mrems (millirems) are still seen in media reports too:    1 mrem = 10 µSv

1 rem = 0.01 Sv= 10 mSv = 10,000 µSv

Remember: In the Standard International (SI) units the rem has been replaced by the Sievert, and the rad has been replaced by the Gray:

- the Sievert (Sv)  -> 1Sv = 100 rem

- the Gray (Gy).   -> 1Gy = 100 rad

CAUTION: - Comparing dose rates is NOT a dependable way to gauge dangers from fallout. For a complementary perspective, see my Radiation Exposure Effects page.

If you spot an error, please immediately leave a comment, I’ll fix it asap.  Tx!

Additional SOURCES:

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27 Responses to Radiation Units

  1. Anonymous says:

    I think you’ve got this conversion incorrect: 1 nGy/hr ≈ 10 µSv/hr.

    It should be: 1 nGy/hr. ≈ .001 µSv/hr.

    So for example, a city in Ibaraki prefecture is reading 631 nGy/hr.
    631 / 1000 = .631 µSv/hr.
    .631 / 1000 = .000631 mSv/hr.
    .000631 x 100,000 = 63 CPM (~ 30 CPM above background)

    [Ok- fixed. You were correct. THANK YOU! I fixed the reference in JPN as well, and used your correction example in the text. - mvb]

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  20. Richard says:

    Thanks for this conversion information.
    So, levels of 104 CPM on an Inspector in rural New Zealand… any thoughts on that?

    • Hi Richard,

      Could be normal. Depends. Try to find other folks in New Zealand with the same Inspector, for best comparisons.

      What’s the altitude? The soil? Both have a big effect on radiation measurement. (much higher in the mountains (from cosmic rays) and near granite, or where there’s more radon, for instance)
      How does it compare to sealevel/beach (where radiation is always the lowest)?
      Measure 24-hour averages over a period of weeks in that and other spots to establish a baseline. Then when there’s a deviation, check space weather data first. If there’s a true anomaly, have it double-checked, or take a soil sample and mail it to a lab for radioisotope analysis. Those are my thoughts. Hope that helps.

      And thanks for commenting. Glad the info’s helpful.

  21. A. K. Farhood says:

    could you tell me please how I can converts mrad/hr to Bq/m3 or Bq/L or Bq/gm
    with many thanks

  22. Your site is tremendously helpful and well-researched! Thank you.

    You might want to update your link to this:


    (which is now a dead link)

    to this:


    Best wishes,
    Steve Goodheart

  23. Aristides Orlandi Neto says:

    Hello, I work in the oil industry and would like to convert nGy/hr to Gapi units? Do you know how to convert that? Thanks. Excellent site by the way.

    • nanogray per hour …to… gamma radiation in American Petroleum Institute units. I read the Wikipedia entry on gamma ray logging (http://en.wikipedia.org/wiki/Gamma_ray_logging ) and it appears that you’d have to quite a number of parameters to calculate a conversion. SHort answer: I don’t know.

      Further reading: This pdf is one of the most informative overviews of the gAPI I found:


      From which this quote: “[...] Natural gamma radiation (NGR) is a useful lithologic parameter because the “primeval” emitters are at secular equilibrium; i.e., radiation at characteristic energies is constant with time (e.g., Adams and Gaspirini, 1970). Radioisotopes with sufficiently long life and that decay to produce an appreciable amount of
      gamma rays are potassium (40K) with a half-life of 1.3 × 109 years, thorium
      (232Th) with a half-life of 1.4 × 1010 years, and uranium (238U) with a half-life of
      4.4 × 109 years. Minerals that fix K, U, and Th, such as clay minerals, are the principal source of NGR. Other examples include arkosic silt and sandstones, potassium salts, bituminous and alunitic schists, phosphates, certain carbonates, some coals, and acid or acido-basic igneous rocks (Serra, 1984).
      Gamma rays are electromagnetic waves with frequencies between 1019 and 1021 Hz. They are emitted spontaneously from an atomic nucleus during radioactive decay, in packets referred to as photons. The energy transported by a photon is related to the wavelength λ or frequency ν by
      E = hν = hc/λ (1)
      where c is the velocity of light, and h is Planck’s constant (6.626 10–34 joule). The energy is expressed in eV (electron-volts). For our purposes, the multiples KeV or MeV are used. Each nuclear species (isotope) emits gamma rays of one or more specific energies.
      Activity, A, is the rate of radioactive decay and decreases exponentially according to
      A=λdN= λdN0e-λdt (2) where λd is the decay constant, and N and N0 are the number of atoms at times t
      and t0, respectively. The original unit of activity was defined as the number of disintegrations per second occuring in 1 g of 226Ra. In 1950, the Curie (Ci) was
      redefined as exactly 3.7 × 1010 disintegrations per second. For most purposes, the multiples mCi or μCi are used. Each radioactive species has an intrinsic specific activity (ISA), which is the activity of a unit mass of the pure material (the isotope). According to Adams and Weaver (1958), the relative activities of the elements K, U, and Th, are 1, 1300, and 3600, respectively.
      The well-logging industry created an arbitrary NGR activity scale, the GAPI (gamma-ray, American Petroleum Industry) units. The GAPI scale is defined at a calibration pit at the University of Houston, Texas. The pit consists of three zones of specific mixtures of Th, U, and K: two of low activity and one of high activity (Belknap et al., 1959). The GAPI is defined as 1/200 of the deflection measured between the high- and low-activity zones in the calibration pit. Limestones have readings of 15–20 GAPI while shales vary from 75 to 150 GAPI, with maximum readings of about 300 GAPI for very radioactive shales (Dewan, 1983). In addition to the master calibration in the test pit, secondary calibrations are carried out in the field.
      Until recently, all commercial NGR logs, including the Schlumberger natural gamma tool (NGT) logs generated during ODP operations, were reported in GAPI units. The MST NGR apparatus can obviously not be calibrated in the API calibration pit, although Hoppie et al. (1994) suggested using downhole logs as a relative GAPI standard for core measurements. However, there appears to be no particular need or advantage to converting core measurements to GAPI, perhaps because NGR core logging devices are not widely used. MST-NGR data are therefore reported in counts per second (cps). This measurement unit is dependent on the device and the volume of material measured; i.e., the cps values from the same ODP cores are different if measured on a different instrument, and they are also different if measured in the ODP device but on different core diameters.
      Perhaps the most useful absolute quantification of NGR is expressing the total activity in terms of the elemental concentrations of K, U, and Th. Quantifying the emitters is most useful for geologic interpretation. Because most well-logging companies collect spectral NGR data these days, it is common for industry to report the measurement in K, U, and Th concentrations. However, the spectral analysis procedures are not standardized and the quality of the elemental yield estimates may vary significantly. An ODP project is under way to manufacture custom standards for the MST-NGR device that will allow elemental yield estimates in the future. [...]”

      That’s the best I can do. Hope that’s helpful.

      If need be, perhaps a company like Schlumberger could help you further: http://www.slb.com/services/characterization/petrophysics/wireline/legacy_services/gamma_ray.aspx


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