a dose of 180 cGy is delivered to a depth of 7.0cm on the central axis with a 6M

Question

a dose of 180 cGy is delivered to a depth of 7.0cm on the central axis with a 6MV beam having field size 10x10cm^2 and SSD=100cm.
A) what is the dose deposited at depth dmax on the central axis? B) what is the dose deposited at a depth of 12cm on the central axis? a dose of 180 cGy is delivered to a depth of 7.0cm on the central axis with a 6MV beam having field size 10x10cm^2 and SSD=100cm.
A) what is the dose deposited at depth dmax on the central axis? B) what is the dose deposited at a depth of 12cm on the central axis? a dose of 180 cGy is delivered to a depth of 7.0cm on the central axis with a 6MV beam having field size 10x10cm^2 and SSD=100cm.
A) what is the dose deposited at depth dmax on the central axis? B) what is the dose deposited at a depth of 12cm on the central axis?

Explanation / Answer

SSD =100cm ,dose =180cGY, depth 7.0cm ,central axis beam 6MV , feild size =10*10cm.

A] what is the dose deposited at depth dmax on the central axis?

Dmax dose occurs at the same depth [dmax] for a given energy regardless the field size or distance from the source .percentage depth dose = does at depth /dose at dmax *100percent . as the feild size is 10*10 and ionization reading as 180cGy , SSD as 100 cm ,with simple division we get dose rate per motor unit 180/100 = 1.8 is the dosage per motor unit .

so the dose deposited at depth dmax will be 1.8 /per motor unit .

2. what is the dose deposited at a depth of 12cm on the central axis?

percentage depth dose = does at depth /dose at dmax *100percent ,from above we got dmax as 1.8 per motor unit ,dose at depth =12cm ,= 12/1.8 =6.6 per motor unit ,

so to conclude dose deposited at depth 12cm is 6.6 per motor unit

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