Question

An 8.33 x 10^6 MBq point source of a radioisotope emits a 1.0-MeV gamma photon in 67% of its transformations. This is the only gamma radiation emitted. (a) Calculate the thickness of lead shielding needed to reduce the exposure rate to 10.0 +/- 0.5 mR/h at a distance of 1.5 m. (b) What fraction of the incident photons pass through the shield without having an interaction?

Name: an 833 x 106 mbq point source of a radioisotope emits a 10 mev gamma photon in 67 of its transformations this is the only gamma radiation emitted a calculate the thickness of lead shielding 66792
Uploaded: 2024-04-11T14:52:06-08:00
Duration: 1 min 24 s
Channel: Kratika Bhadauria
Description: an 833 x 106 mbq point source of a radioisotope emits a 10 mev gamma photon in 67 of its transformations this is the only gamma radiation emitted a calculate the thickness of lead shielding 66792

          An 8.33 x 10^6 MBq point source of a radioisotope emits a 1.0-MeV gamma photon in 67% of its transformations. This is the only gamma radiation emitted. 

(a) Calculate the thickness of lead shielding needed to reduce the exposure rate to 10.0 +/- 0.5 mR/h at a distance of 1.5 m. 

(b) What fraction of the incident photons pass through the shield without having an interaction?

Added by Jennifer J.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Kratika Bhadauria

04/11/2024

Step 1

5 m from the point source. Given: Initial activity of the point source = 8.33 x 10^6 MBq Energy of gamma photon emitted = 1.0 MeV Percentage of transformations emitting gamma photons = 67% First, convert the activity from MBq to Bq: 8.33 x 10^6 MBq = 8.33 x 10^6 Show more…

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An 8.33 x 10^6 MBq point source of a radioisotope emits a 1.0-MeV gamma photon in 67% of its transformations. This is the only gamma radiation emitted. (a) Calculate the thickness of lead shielding needed to reduce the exposure rate to 10.0 +/- 0.5 mR/h at a distance of 1.5 m. (b) What fraction of the incident photons pass through the shield without having an interaction?