Lungs retention HELP

It gives the lung retention (thoracic) as function of time.

Intake. - The input format depends on the "Intake type" chosen.

·         For "Acute" write the number of Bq in t = 0

·         For "Constant" write the number of Bq/day.

·         For "Continuous" write {f(t) , t} where f(t) is the input functions. Ej.: {0.1 Exp[- 0.02 t], t}

·         For "MultiInputs" write {{I₀, t₀}, {I₁, t₁}, .... {I_j, t_j},…,{I_n, t_n}} (where I_j, represents the intake the day t_j, and t₁<t₂<..<t_n ). Ej.: {{3, 0},{7, 3}}. The retention is given as function of t after the last intake (t_n=0); Note: The length of the list {{I₀, t₀}, ..., {I_n, t_n}} can be hundred of elements, it will be computed in a few seconds. It can be copied from a ASCII standard program (ej: Notebook).

IntakeType choose "Acute" or "Constant", "Continuous" or "MultiInputs";

• "Acute" is a single intake at t = 0.
• "Constant" (or Chronic) means a constant daily intake (all days the same). Also, it can be used to compute the total disintegrations in lungs (for an acute intake) over a period t (in this case write in Intake: 3600*24*intake value.
• "Continuous" is an intake variable in the time, ej: 0.1 Exp[- 0.02 t].
• "MultiInputs" are multi single (or acute) inputs.

λ is the radioactive decay constant, in day^-1. If you know the half-life T in place of λ, as λ = Log[t]/T you can write: Log[2]/T, ej.: For T = 8.2 year, then write: Log[2]/(365.24*8.2).

AMAD (Activity Median Aerodynamic Diameter): (only by Inhalation) choose the value which you wish (usually AMAD = 5), then the program will select the appropriated Initial fractional Deposition (IFD) values obtained from ICRP 66, or check the right box and include the IFD that you wish replacing {AI, bbfastseq, bbslow,  BBfastseq, BBslow, ET2, ET1}by their numeric values.

Class choose: F or M or S. Then the program will select the appropriate fractional rate of absorption (FRA) values obtained from ICRP 66 or check the right box and include the FRA that you wish replacing {sp, spt, st} by their numeric values.

Time t always in days. The meaning depends on the "Intake type" chosen.

• For "Acute" means time after the intake. Write t (symbolic solution) or the numeric number of days (ej: 2 ).
• For "Constant" means time after starting the intake. Or if you wish evaluate the total disintegrations over a period t , as consequence an acute intake, write t1*365.24, being t1 the number of year, usually 50.
• For "Continuous" means time after starting the intake. Write t (symbolic solution) or the numeric number of days (ej: 2 )
• For "MultiInputs" means the time after last intake. Write t (symbolic solution) or the numeric number of days (ej: 2 ).