My RAD Monitor

This page is a curated dashboard of data collected by my uRADMonitor, processed by the uRADMonitor data collectors, intermingled with random bits of information grabbed from Wikipedia.


Radiation CPM

Radiation: Counts per Minute


Counts per minute is a measure of the detection rate of ionization events per minute. Counts are only manifested in the reading of the measuring instrument, and are not an absolute measure of the strength of the source of radiation. Source


Radiation μSv/h

Radiation: μSv/h


The sievert is a derived unit of ionizing radiation dose in the International System of Units (SI). It is a measure of the health effect of low levels of ionizing radiation on the human body. Source

Fun Comparisons of Things that can Kill You

  • 0.098 μSv
    banana equivalent dose, a whimsical unit of radiation dose representing the measure of radiation from a typical banana
  • 0.25 μSv
    U.S. limit on effective dose from a single airport security screening
  • 5 to 10 μSv
    one set of dental radiographs
  • 80 μSv
    average dose to people living within 16 km of Three Mile Island accident
  • 0.4 to 0.6 mSv
    two-view mammogram, using weighting factors updated in 2007
  • 1 mSv
    The U.S. 10 CFR § 20.1301(a)(1) dose limit for individual members of the public, total effective dose equivalent, per annum
  • 1.5 to 1.7 mSv
    annual dose for flight attendants
  • 2 to 7 mSv
    barium fluoroscopy, e.g. Barium meal, up to 2 minutes, 4–24 spot images
  • 2 to 7 mSv
    barium fluoroscopy, e.g. Barium meal, up to 2 minutes, 4–24 spot images
  • 10 to 30 mSv
    single full-body CT scan
  • 50 mSv
    The U.S. 10 C.F.R. § 20.1201(a)(1)(i) occupational dose limit, total effective dose equivalent, per annum
  • 68 mSv
    estimated maximum dose to evacuees who lived closest to the Fukushima I nuclear accidents
  • 80 mSv
    6 months stay on the International Space Station
  • 250 mSv
    6 month trip to Mars – radiation due to cosmic rays, which are very difficult to shield against
  • 500 mSv
    The U.S. 10 C.F.R. § 20.1201(a)(2)(ii) occupational dose limit, shallow-dose equivalent to skin, per annum
  • 670 mSv
    highest dose received by a worker responding to the Fukushima emergency
  • 1 Sv
    Maximum allowed radiation exposure for NASA astronauts over their career
  • 4.5 to 6 Sv
    fatal acute doses during Goiânia accident
  • 5.1 Sv
    fatal acute dose to Harry Daghlian in 1945 criticality accident
  • 21 Sv
    fatal acute dose to Louis Slotin in 1946 criticality accident
  • 64 Sv
    nonfatal dose to Albert Stevens spread over ~21 years, due to a 1945 plutonium injection experiment by doctors working on the secret Manhattan Project.

To get a sense of some of these values we can graph them on a scale.


In this case it’s really difficult to get an understanding of scale here. Everything sits a smidge above 0 right until you’re dead. Lovely. What we really want to see is the magnitude of the range of values.


Now we can see the full range of values. We’re still dead at the same point, but now we can see the relative intensity of each example.

Device Information

Environmental factors can influence the readings so it’s important to compare against what else is going on around the device.


Temperature °C


Tube Voltage

Tube Voltage


Duty Cycle

Duty Cycle

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