How do you calculate the specific activity of uranium?

How do you calculate the specific activity of uranium?

The Health Physics Manual of Good Practices for Uranium Facilities’ (EGG-2530) provides the following equation for calculating the specific activity (uCi/g) from the uranium enrichment (weight percent 2″U): S = (0.4 +0.38E +0.0034E) (1) where: S = specific activity (uCi/g), and E = weight % 235U.

What is the specific activity of U-238?


U-234 U-238
half-life 244,500 years 4.468 · 109 years
specific activity 231.3 MBq/g 12,445 Bq/g

How many becquerels are in uranium?

0.07 becquerels
The mass concentration of uranium in soil varies widely, but is typically about 3 parts per million (ppm), or 0.07 becquerels per gram (Bq g-1).

What is used in enrichment of U-235?

Gaseous diffusion is a technology used to produce enriched uranium by forcing gaseous uranium hexafluoride (hex) through semi-permeable membranes. This produces a slight separation between the molecules containing 235U and 238U.

How do you calculate specific activity?

In summary, specific activity = enzyme units / (vol. in µl x (protein conc. in mg per ml / 1000))

What is the specific activity of natural uranium?

Specific Activity (Bq mg-1) The activity concentration arising solely from the decay of the uranium isotopes (U-234, U-235 and U-238) found in natural uranium is 25.4 Bq per mg.

How do you find the specific activity of an isotope?

  1. Activity = λN.
  2. = (0.693/8 days) x (1/86,400 sec/day) x (3 x 1017 atoms)
  3. = 3 x 1011 atoms/sec I-131.
  4. = 3 x 1011 dps I-131.

How many uranium isotopes are there?

There are three naturally occurring isotopes of uranium: uranium-238, the heaviest and most abundant, uranium-235 and uranium-234. Uranium-235 is the only isotope that undergoes fission.

How many becquerels is safe?

The safe level of radon at home, as recommended by Environmental Protection Act (EPA), is 4 picocuries per liter (pCi/L) of air or 148 becquerels per cubic meter (Bq/m3) (‘picocurie’ and ‘becquerel’ are common units for measuring the amount of radioactivity).

How is uranium-235 enriched?

Uranium can be enriched by separating isotopes of uranium with lasers. Molecules can be excited by laser light; this is called photoexcitation. Lasers can increase the energy in the electrons of a specific isotope, changing its properties and allowing it to be separated.

Which centrifuge is used in uranium enrichment?

The Zippe-type centrifuge is a gas centrifuge designed to enrich the rare fissile isotope uranium-235 (235U) from the mixture of isotopes found in naturally occurring uranium compounds.

How do you calculate specific activity in radioactivity?

Curie or Ci – the most common unit of measure for the radioactivity of a substance. 1 Ci = 3.7×1010 disintegrations per second = 2.22×1012 disintegrations per minute (dpm). The term is most often used as a microCurie (µCi)….Unit conversions.

To convert from __ to __: Multiply by:
from dpm to TBq 1.67×10-14

What kind of uranium is in uranyl acetate?

Uranyl acetate and uranyl nitrate principally contain the isotope 238U of uranium.

What is the activity of uranyl acetate in microcuries?

Uranyl Acetate sold by ELECTRON MICROSCOPY SCIENCES has an activity of: U (depleted) .51µCi·gm -1 (µCi = microcuries) Formula for conversion to Bq is: 1 Ci = 3.7 x 10 10 Bq

What’s the maximum amount of uranyl acetate you can put in the sewer?

Disposal of uranyl acetate and uranyl nitrate solutions is relatively simple. Aqueous and diluted solutions may be poured down a sink designated by your RSO, followed by flushing with plenty of water. The maximum amount of uranyl acetate or uranyl nitrate that may be disposed of to the sewer in any 24-hour period is approximately 50g.

Is it safe to use uranyl acetate in microscopy?

Even with the relatively small amounts used in microscopy, there are associated chemical and radiological hazards which require some basic safety precautions to be adopted; with the emphasis on avoiding the possibility of inhalation or ingestion of the material. Uranyl acetate and uranyl nitrate principally contain the isotope 238U of uranium.