Radiation calculation confusion

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SUMMARY

The discussion centers on converting the exposure rate from 137Cs, measured at 2.50 mGy/h, into becquerels (Bq). The user expresses confusion regarding the conversion process, noting that milliGrays (mGy) and becquerels are fundamentally different measurements. The relevant equation for this conversion involves understanding the relationship between radiation intensity and distance, specifically using the formula I1d12 = I2d22. The user seeks clarification on whether a direct conversion exists or if it requires multiple intermediary units.

PREREQUISITES
  • Understanding of radiation exposure concepts, specifically milliGrays (mGy) and becquerels (Bq).
  • Familiarity with the inverse square law in radiation physics.
  • Knowledge of radiation intensity and distance relationships.
  • Basic proficiency in unit conversion techniques in physics.
NEXT STEPS
  • Research the relationship between radiation exposure (mGy) and activity (Bq) for 137Cs.
  • Study the inverse square law and its applications in radiation calculations.
  • Learn about intermediary units used in radiation measurement conversions.
  • Explore practical examples of converting exposure rates to activity in radiation safety contexts.
USEFUL FOR

Students in physics or radiological sciences, radiation safety professionals, and anyone involved in radiation measurement and calculations will benefit from this discussion.

murdrobe
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Homework Statement



6. If the exposure rate from 137Cs at one metre is 2.50 mGy/h, how many bequerels are present?

Homework Equations



Exposure is a quantity that expresses the radiation delivered to a point at a certain distance.

I1d12 = I2d22
I1 = the radiation intensity at distance d1 from the radiation source.
d1 = the shorter distance from the source where the radiation intensity is I1.
I2 = the radiation intensity at distance d2 from the radiation source.
d2 = the longer distance from the source where the radiation intensity is I2.

I1 I2
source* ------------>|----------> |
------------>| |
d1 d2




The Attempt at a Solution



my issue is that it seems we are being asked to convert miliGrays to becquerels and I am not sure how that's done, they seem to be a measure of different things from what i was taught so surely a conversion will be imperfect?

from looking around on the internet, it seems possible but via conversion through several intermediatry units. is that how this is meant to be achieved or is there a simpler method?
 
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*shameless bump*

this 1 has stumped me a little sorry.
 

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